JP7638741B2 - Fiber-reinforced mortar composition and mortar thereof - Google Patents
Fiber-reinforced mortar composition and mortar thereof Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims description 60
- 239000000203 mixture Substances 0.000 title claims description 32
- 239000000835 fiber Substances 0.000 claims description 72
- 229910052751 metal Inorganic materials 0.000 claims description 56
- 239000002184 metal Substances 0.000 claims description 56
- 239000011230 binding agent Substances 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 27
- 239000004568 cement Substances 0.000 claims description 21
- 239000011575 calcium Substances 0.000 claims description 19
- 229910052791 calcium Inorganic materials 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- -1 calcium aluminates Chemical class 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 15
- 229910052602 gypsum Inorganic materials 0.000 claims description 12
- 239000010440 gypsum Substances 0.000 claims description 12
- 239000004567 concrete Substances 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 description 22
- 238000011161 development Methods 0.000 description 14
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- 230000007774 longterm Effects 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000007665 sagging Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 239000011398 Portland cement Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 235000015165 citric acid Nutrition 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910021487 silica fume Inorganic materials 0.000 description 3
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 2
- 150000008041 alkali metal carbonates Chemical class 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000323 aluminium silicate Inorganic materials 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- 235000002906 tartaric acid Nutrition 0.000 description 2
- 239000011975 tartaric acid Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- VEUACKUBDLVUAC-UHFFFAOYSA-N [Na].[Ca] Chemical compound [Na].[Ca] VEUACKUBDLVUAC-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 150000001642 boronic acid derivatives Chemical class 0.000 description 1
- USOPFYZPGZGBEB-UHFFFAOYSA-N calcium lithium Chemical compound [Li].[Ca] USOPFYZPGZGBEB-UHFFFAOYSA-N 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 150000001860 citric acid derivatives Chemical class 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000000174 gluconic acid Substances 0.000 description 1
- 235000012208 gluconic acid Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000005300 metallic glass Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical compound C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000011433 polymer cement mortar Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 235000000346 sugar Nutrition 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 150000003892 tartrate salts Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、繊維補強モルタル組成物及びそのモルタルに関する。 The present invention relates to a fiber-reinforced mortar composition and a mortar made thereof.
近年、建築構造物や土木構造物に対する超高層化・大規模化・高耐久性化の要求が一層明確になっている。このような構造物を実現するために高強度モルタルの開発が行われている。高強度モルタルとして、例えば、少なとも、セメント、ポゾラン質微粉末、粒径３．５ｍｍ以下の細骨材、減水剤及び水を含むことを特徴とする超高強度モルタルが開示されている（特許文献１）。 In recent years, the demand for taller, larger, and more durable architectural and civil engineering structures has become clearer. To realize such structures, high-strength mortars are being developed. For example, an ultra-high-strength mortar that contains at least cement, pozzolanic fine powder, fine aggregate with a particle size of 3.5 mm or less, a water-reducing agent, and water has been disclosed as a high-strength mortar (Patent Document 1).
各種構造物に用いられるコンクリートは本来耐久性に優れたものであるが、構造や使用環境によってその一部が劣化する場合がある。このような劣化が生じると構造物の機能が低下する恐れがあるため、劣化部位の修復及び補強が必要となる。劣化部位の修復及び補強には、例えば、セメント、フライアッシュ、液体の収縮低減剤をまぶした細骨材、流動化剤、膨張材、粉末ポリマー、増粘剤、及び短繊維を含有する繊維補強モルタル組成物が用いられる（特許文献２）。 Although concrete used in various structures is inherently highly durable, parts of it may deteriorate depending on the structure and the environment in which it is used. When such deterioration occurs, there is a risk that the functionality of the structure may decrease, making it necessary to repair and reinforce the deteriorated areas. To repair and reinforce deteriorated areas, for example, a fiber-reinforced mortar composition containing cement, fly ash, fine aggregate coated with a liquid shrinkage-reducing agent, a superplasticizer, an expansive agent, a powdered polymer, a thickener, and short fibers is used (Patent Document 2).
高強度モルタルを用いた構造物に劣化が生じた場合、その劣化部位を修復及び補強する材料にも高強度であることが求められる。しかしながら、高強度モルタルは低水セメント比であることが多く、繊維を混和する場合、繊維の混練性及び分散性が問題となることがあった。 When deterioration occurs in a structure that uses high-strength mortar, the materials used to repair and reinforce the deteriorated area are also required to be high-strength. However, high-strength mortar often has a low water-cement ratio, and when fibers are mixed in, the kneadability and dispersibility of the fibers can become an issue.
また、道路や鉄道等の構造物の部分的な補修工事のように工事できる時間が限られている場合、補修材料としては、材料の練り混ぜが容易であり、施工後に速やかに強度発現する材料が求められている。しかしながら、上述したとおり高強度モルタルに繊維を配合する場合、繊維の混練性及び分散性が問題となることもあり、モルタルの調製し易さと、施工性、速硬性及び長期強度の発現性とを両立することが困難だった。 In addition, when the time available for construction work is limited, such as in partial repair work on roads, railways, and other structures, repair materials are required to be easy to mix and to quickly develop strength after construction. However, as mentioned above, when blending fibers into high-strength mortar, the kneadability and dispersibility of the fibers can become problematic, making it difficult to balance ease of preparation of the mortar with workability, rapid hardening, and the ability to develop long-term strength.
したがって、本発明は、繊維の分散性に優れ、且つ、施工性、速硬性及び長期強度の発現性に優れる繊維補強モルタル組成物及びそのモルタルを提供することを目的とする。 Therefore, the present invention aims to provide a fiber-reinforced mortar composition and mortar having excellent fiber dispersion, workability, rapid hardening properties, and long-term strength.
本発明者は、上記課題について鋭意検討した結果、結合材の強熱減量を調整し、特定の形状を有する金属繊維を特定量配合することで、繊維の分散性に優れ、且つ、施工性、速硬性及び長期強度の発現性に優れる繊維補強モルタル組成物及びそのモルタルが得られることを見出した。 As a result of thorough research into the above-mentioned problems, the inventors have discovered that by adjusting the ignition loss of the binder and blending a specific amount of metal fibers having a specific shape, it is possible to obtain a fiber-reinforced mortar composition and a mortar made from the same that have excellent fiber dispersion, workability, rapid hardening properties, and long-term strength.
すなわち、本発明は以下の［１］～［６］である。
［１］
セメント、カルシウムアルミネート類、石膏類及びポゾラン物質からなる結合材と、金属繊維とを含み、前記結合材の強熱減量が、０．７～６．４質量％であり、前記金属繊維の含有量が、前記結合材１００質量部に対し、１～２４質量部であり、前記金属繊維が、略直線部と、前記金属繊維の少なくとも一方の端部から前記略直線部と角度を有するように折り曲げて形成された変形部とを有する、繊維補強モルタル組成物。
［２］
前記略直線部の長さが、前記金属繊維の全長の５０～９５％を占め、前記変形部が、前記金属繊維の両端部から前記略直線部と３０～１６０度の角度を有するようにそれぞれ折り曲げて形成されている、［１］に記載の繊維補強モルタル組成物。
［３］
前記セメントの含有量が、前記結合材１００質量部に対し、４５～８０質量部である、［１］又は［２］に記載の繊維補強モルタル組成物。
［４］
前記金属繊維のアスペクト比が、２５～１５０である、［１］～［３］のいずれかに記載の繊維補強モルタル組成物。
［５］
膨張材を更に含む、［１］～［４］のいずれかに記載の繊維補強モルタル組成物。
［６］
［１］～［５］のいずれかに記載の繊維補強モルタル組成物と水とを含み、前記水の含有量が、前記結合材１００質量部に対し、２０～４５質量部である、繊維補強モルタル。
That is, the present invention relates to the following [1] to [6].
[1]
A fiber-reinforced mortar composition comprising a binder comprising cement, calcium aluminates, gypsum, and a pozzolanic substance, and metal fibers, wherein the binder has an ignition loss of 0.7 to 6.4 mass%, the metal fibers are contained in an amount of 1 to 24 parts by mass per 100 parts by mass of the binder, and the metal fibers have a substantially straight portion and a deformed portion formed by bending at least one end of the metal fibers so as to form an angle with the substantially straight portion.
[2]
The fiber-reinforced mortar composition according to [1], wherein the length of the approximately straight portion accounts for 50 to 95% of the total length of the metal fiber, and the deformed portion is formed by bending each of both ends of the metal fiber so as to have an angle of 30 to 160 degrees with the approximately straight portion.
[3]
The fiber-reinforced mortar composition according to [1] or [2], wherein the content of the cement is 45 to 80 parts by mass per 100 parts by mass of the binder.
[4]
The fiber-reinforced mortar composition according to any one of [1] to [3], wherein the aspect ratio of the metal fibers is 25 to 150.
[5]
The fiber-reinforced mortar composition according to any one of [1] to [4], further comprising an expansive material.
[6]
[1]-[5]. A fiber-reinforced mortar comprising the fiber-reinforced mortar composition according to any one of [1] to [5] and water, wherein the content of the water is 20 to 45 parts by mass per 100 parts by mass of the binder.
本発明によれば、繊維の分散性に優れ、且つ、施工性、速硬性及び長期強度の発現性に優れる繊維補強モルタル組成物及びそのモルタルを提供することができる。 The present invention provides a fiber-reinforced mortar composition and mortar that have excellent fiber dispersion, workability, rapid hardening, and long-term strength.
以下、図面を適宜参照しながら本発明の一実施形態について説明する。各図は模式図であり、各構成要素の大きさ等は図面に示されたものに限定されるものではない。 One embodiment of the present invention will be described below with reference to the drawings. Each figure is a schematic diagram, and the size of each component is not limited to those shown in the drawings.
本実施形態の繊維補強モルタル組成物は、セメント、カルシウムアルミネート類、石膏類及びポゾラン物質からなる結合材と、金属繊維とを含み、結合材の強熱減量が、０．７～６．４質量％であり、金属繊維の含有量が、結合材１００質量部に対し、１～２４質量部であり、金属繊維が、略直線部と、金属繊維の少なくとも一方の端部から略直線部と角度を有するように折り曲げて形成された変形部とを有する。 The fiber-reinforced mortar composition of this embodiment contains a binder consisting of cement, calcium aluminates, gypsums, and a pozzolanic substance, and metal fibers, the ignition loss of the binder is 0.7 to 6.4 mass%, the content of the metal fibers is 1 to 24 parts by mass per 100 parts by mass of the binder, and the metal fibers have a substantially straight portion and a deformed portion formed by bending at least one end of the metal fibers at an angle to the substantially straight portion.
本実施形態に係る結合材は、セメント、カルシウムアルミネート類、石膏類及びポゾラン物質の４成分から構成される。 The binder in this embodiment is composed of four components: cement, calcium aluminates, gypsum, and pozzolanic substances.
セメントは、種々のものを使用することができ、例えば、普通、早強、超早強、低熱及び中庸熱等の各種ポルトランドセメント、エコセメント、速硬性セメント等が挙げられる。セメントとしては、速硬性及び流動性を両立しやすいという観点から、普通ポルトランドセメント、早強ポルトランドセメントが好ましい。セメントは、一種を単独で用いてもよく、二種以上を併せて用いてもよい。 Various types of cement can be used, including various types of Portland cement such as ordinary, early strength, extra early strength, low heat and medium heat, ecocement, and rapid hardening cement. As for cement, ordinary Portland cement and early strength Portland cement are preferred from the viewpoint of easily achieving both rapid hardening and fluidity. One type of cement may be used alone, or two or more types may be used in combination.
セメントの含有量は、結合材１００質量部に対し、４５～８０質量部であることが好ましく、５０～７５質量部であることがより好ましく、５５～７０質量部であることが更に好ましい。セメントの含有量が上記範囲内であれば、強度発現性がより一層向上する。 The cement content is preferably 45 to 80 parts by mass, more preferably 50 to 75 parts by mass, and even more preferably 55 to 70 parts by mass, per 100 parts by mass of binder. If the cement content is within the above range, strength development is further improved.
カルシウムアルミネート類としては、ＣａＯをＣ、Ａｌ２Ｏ３をＡ、Ｎａ２ＯをＮ、及びＦｅ２Ｏ３をＦとして表したとき、Ｃ３Ａ、Ｃ２Ａ、Ｃ１２Ａ７、ＣＡ、又はＣＡ２等と表示される鉱物組成を有するカルシウムアルミネート、Ｃ４ＡＦ等と表示されるカルシウムアルミノフェライト、カルシウムアルミネートにハロゲンが固溶又は置換したＣ３Ａ３・ＣａＦ２やＣ１１Ａ７・ＣａＦ２等と表示されるカルシウムフルオロアルミネートを含むカルシウムハロアルミネート、Ｃ８ＮＡ３やＣ３Ｎ２Ａ５等と表示されるカルシウムナトリウムアルミネート、カルシウムリチウムアルミネート、アルミナセメント、並びにＣ３Ａ３・ＣａＳＯ４等と表示されるカルシウムサルホアルミネートを総称するものである。このカルシウムアルミネート類は、結晶質のもの、非結晶質のもの、非晶質及び結晶質が混在したもののいずれも使用可能である。カルシウムアルミネート類は、一種を単独で用いてもよく、二種以上を併せて用いてもよい。カルシウムアルミネート類の粉末度は、初期強度発現性をより向上させるという観点から、ブレーン比表面積で３０００ｃｍ２／ｇ以上であることが好ましく、５０００ｃｍ２／ｇ以上であることがより好ましい。また、カルシウムアルミネート類の粉末度は、ブレーン比表面積で８０００ｃｍ２／ｇ以下であることが好ましい。 When CaO is represented as C, Al2O3 as A, Na2O as N, and Fe2O3 as F, calcium aluminates collectively refer to calcium aluminates having a mineral composition represented as C3A , C2A , C12A7 , CA, CA2 , etc. , calcium aluminoferrite represented as C4AF , etc., calcium haloaluminates including calcium fluoroaluminates represented as C3A3.CaF2 or C11A7.CaF2 , etc. , in which halogen is dissolved or substituted in calcium aluminate, calcium sodium aluminate represented as C8NA3 or C3N2A5 , etc. , calcium lithium aluminate, alumina cement, and calcium sulfoaluminate represented as C3A3.CaSO4 , etc. The calcium aluminates may be crystalline, amorphous, or a mixture of amorphous and crystalline. The calcium aluminates may be used alone or in combination of two or more. From the viewpoint of further improving the early strength development, the fineness of the calcium aluminates is preferably 3000 cm 2 /g or more, more preferably 5000 cm 2 /g or more in terms of Blaine specific surface area. The fineness of the calcium aluminates is preferably 8000 cm 2 /g or less in terms of Blaine specific surface area.
カルシウムアルミネート類の含有量は、結合材１００質量部に対し、１０～３５質量部であることが好ましく、１１～３０質量部であることがより好ましく、１２～２５質量部であることが更に好ましい。カルシウムアルミネート類の含有量が上記範囲内であれば、速硬性がより優れたものとなりやすい。 The content of calcium aluminates is preferably 10 to 35 parts by mass, more preferably 11 to 30 parts by mass, and even more preferably 12 to 25 parts by mass, per 100 parts by mass of binder. If the content of calcium aluminates is within the above range, the rapid hardening property is likely to be excellent.
石膏類としては、例えば、無水石膏、半水石膏、二水石膏等が挙げられる。石膏類としては、強度発現性を更に向上させるという観点から、無水石膏が好ましい。石膏類は、一種を単独で用いてもよく、二種以上を併せて用いてもよい。 Examples of gypsum include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum. As the gypsum, anhydrous gypsum is preferred from the viewpoint of further improving the strength development. One type of gypsum may be used alone, or two or more types may be used in combination.
石膏類の含有量としては、結合材１００質量部に対し、６．５～２３質量部であることが好ましく、７～２０質量部であることがより好ましく、７～１８質量部であることが更に好ましい。石膏類の含有量が上記範囲内であれば、長期の強度発現性がより一層向上する。石膏類の粉末度は、長期の強度発現性をより向上させるという観点から、ブレーン比表面積で４５００ｃｍ２／ｇ以上であることが好ましく、６０００ｃｍ２／ｇ以上であることがより好ましい。また、石膏類の粉末度は、ブレーン比表面積で１５０００ｃｍ２／ｇ以下であることが好ましい。 The content of the gypsum is preferably 6.5 to 23 parts by mass, more preferably 7 to 20 parts by mass, and even more preferably 7 to 18 parts by mass, relative to 100 parts by mass of the binder. If the content of the gypsum is within the above range, the long-term strength development is further improved. From the viewpoint of further improving the long-term strength development, the fineness of the gypsum is preferably 4500 cm 2 /g or more in terms of Blaine specific surface area, and more preferably 6000 cm 2 /g or more. In addition, the fineness of the gypsum is preferably 15000 cm 2 /g or less in terms of Blaine specific surface area.
ポゾラン物質は、ＪＩＳ Ａ ６２０１：２０１５に記載されている各種フライアッシュ、ＪＩＳ Ａ ６２０７：２０１６に記載されているシリカフューム、スラグ粉末、非晶質アルミノシリケート等が挙げられる。ポゾラン物質は、長期の強度発現性や施工性に一層優れるという観点から、シリカフューム、非晶質アルミノシリケートが好ましい。ポゾラン物質は、一種を単独で用いてもよく、二種以上を併せて用いてもよい。 Examples of pozzolanic substances include various fly ashes described in JIS A 6201:2015, and silica fume, slag powder, and amorphous aluminosilicates described in JIS A 6207:2016. From the viewpoint of superior long-term strength development and workability, silica fume and amorphous aluminosilicates are preferred as pozzolanic substances. One type of pozzolanic substance may be used alone, or two or more types may be used in combination.
ポゾラン物質の含有量は、結合材１００質量部に対し、１～２４質量部であることが好ましく、２～２０質量部であることがより好ましく、３～１８質量部であることが更に好ましく、４～１５質量部であることが特に好ましい。ポゾラン物質の含有量が上記範囲内であれば、初期及び長期の強度発現性がより一層両立しやすい。ポゾラン物質の粉末度は、長期の強度発現性をより向上させるという観点から、ＢＥＴ比表面積で５ｍ２／ｇ以上であることが好ましく、１０ｍ２／ｇ以上であることがより好ましい。また、ポゾラン物質の粉末度は、ＢＥＴ比表面積で３０ｍ２／ｇ以下であることが好ましい。 The content of the pozzolanic substance is preferably 1 to 24 parts by mass, more preferably 2 to 20 parts by mass, even more preferably 3 to 18 parts by mass, and particularly preferably 4 to 15 parts by mass, relative to 100 parts by mass of the binder. If the content of the pozzolanic substance is within the above range, it is easier to achieve both initial and long-term strength development. From the viewpoint of further improving long-term strength development, the fineness of the pozzolanic substance is preferably 5 m 2 /g or more, more preferably 10 m 2 /g or more in terms of BET specific surface area. Furthermore, the fineness of the pozzolanic substance is preferably 30 m 2 /g or less in terms of BET specific surface area.
結合材の強熱減量は、０．７～６．４質量％である。結合材の強熱減量が上記範囲外であると、金属繊維の混練性、作業性、初期の強度発現性等が低下する。混練性や強度発現性が優れたものになりやすいという観点から、結合材の強熱減量は、０．９～５質量％であることが好ましく、１．０～４．５質量％であることがより好ましい。 The ignition loss of the binder is 0.7 to 6.4% by mass. If the ignition loss of the binder is outside the above range, the kneadability, workability, initial strength development, etc. of the metal fibers will decrease. From the viewpoint of easily achieving excellent kneadability and strength development, the ignition loss of the binder is preferably 0.9 to 5% by mass, and more preferably 1.0 to 4.5% by mass.
強熱減量は、結合材を構成する各材料の調整、加熱等による結合材中の有機物量の調整、乾燥や湿潤による結合材中の水分量の調整等の方法により調整することができる。強熱減量は、空焼きしたるつぼに結合材試料１ｇを量り取り、７００℃に調整した電気炉に置き、１５分間強熱し、強熱前後の重量変化から算出することができる。 The loss on ignition can be adjusted by adjusting each material that makes up the binder, adjusting the amount of organic matter in the binder by heating, etc., adjusting the amount of moisture in the binder by drying or wetting, etc. The loss on ignition can be calculated by weighing out 1 g of binder sample into an empty crucible, placing it in an electric furnace adjusted to 700°C, and igniting for 15 minutes, and then calculating from the change in weight before and after ignition.
図１は、本実施形態に係る金属繊維１０の形状を模式的に表したものである。金属繊維１０は、略直線部１と、金属繊維１０の少なくとも一方の端部から略直線部１と角度Ａを有するように折り曲げて形成された変形部２とから構成される。図１に示されるように、角度Ａは、金属繊維１０を折り曲げ始めた点（始点３）及び変形部２に含まれる金属繊維１０の端部（終点４）を結んだ線と、略直線部１とのなす角である。 Figure 1 is a schematic diagram showing the shape of the metal fiber 10 according to this embodiment. The metal fiber 10 is composed of an approximately straight portion 1 and a deformed portion 2 formed by bending at least one end of the metal fiber 10 at an angle A with the approximately straight portion 1. As shown in Figure 1, angle A is the angle between the approximately straight portion 1 and a line connecting the point where the metal fiber 10 begins to be bent (start point 3) and the end of the metal fiber 10 included in the deformed portion 2 (end point 4).
略直線部１の長さは、金属繊維１０の全長の５０～９５％であることが好ましく、６０～９４％であることがより好ましく、７０～９３％であることが更に好ましい。略直線部１の長さが上記範囲内であれば、モルタルの混練性及び作業性がより一層向上する。 The length of the approximately straight portion 1 is preferably 50 to 95% of the total length of the metal fiber 10, more preferably 60 to 94%, and even more preferably 70 to 93%. If the length of the approximately straight portion 1 is within the above range, the kneadability and workability of the mortar are further improved.
変形部２の形状は特に限定されるものではない。変形部２は、図１（ａ）に示されるように直線状であってもよく、図１（ｂ）に示されるように曲線であってもよい。変形部２の途中で更に折り曲げられていてもよい。例えば、図１（ｃ）に示されるように変形部２の途中で更に１回折り曲げられていてもよく、図１（ｄ）に示されるように変形部２の途中で更に３回折り曲げられていてもよい。変形部２の途中に折れ曲がりを有する場合であっても、変形部２の始点３は、略直線部１と接する点であり、終点４は、変形部２に含まれる金属繊維１０の端部である。変形部２の途中の折れ曲がりのなす角は特に限定されない。変形部２は、金属繊維１０に複数あってもよい。例えば、図１（ｅ）に示されるように金属繊維１０の両端部にそれぞれ変形部２を有してもよく、図１（ｆ）に示されるように金属繊維１０の一方の端部に２つの変形部２を有してもよい。モルタルのダレ等を一層低減し、作業性を高めるという観点から、金属繊維１０としては、金属繊維１０の両端部にそれぞれ変形部２を有し、且つ変形部２の途中で更に１回以上折り曲げられているものが好ましく、変形部２の途中で変形部２の端部が互いに離れる方向へ１回折り曲げられて略直線部１と平行としたものがより好ましい（図１（ｅ））。 The shape of the deformation portion 2 is not particularly limited. The deformation portion 2 may be linear as shown in FIG. 1(a) or curved as shown in FIG. 1(b). The deformation portion 2 may be further folded in the middle. For example, the deformation portion 2 may be further folded once in the middle as shown in FIG. 1(c), or may be further folded three times in the middle as shown in FIG. 1(d). Even if the deformation portion 2 has a bend in the middle, the start point 3 of the deformation portion 2 is a point of contact with the approximately straight line portion 1, and the end point 4 is an end of the metal fiber 10 included in the deformation portion 2. The angle of the bend in the middle of the deformation portion 2 is not particularly limited. The deformation portion 2 may be multiple in the metal fiber 10. For example, the metal fiber 10 may have a deformation portion 2 at each of both ends as shown in FIG. 1(e), or may have two deformation portions 2 at one end of the metal fiber 10 as shown in FIG. 1(f). From the viewpoint of further reducing mortar dripping and improving workability, it is preferable that the metal fiber 10 has a deformed portion 2 at each end of the metal fiber 10 and is further folded at least once in the middle of the deformed portion 2, and more preferably, the ends of the deformed portion 2 are folded once in the middle of the deformed portion 2 in a direction away from each other so as to be parallel to the approximately straight portion 1 (Figure 1 (e)).
角度Ａは３０～１６０度であることが好ましく、５０～１６０度であることがより好ましく、７０～１６０度であることが更に好ましく、９０～１５０度であることが更により好ましく、１２０～１５０度であることが最も好ましい。角度Ａが上記範囲内であれば、モルタルの作業性がより一層向上する。金属繊維１０が複数の変形部２を有する場合、それぞれの角度Ａは同一であってもよいし、異なっていてもよい。 Angle A is preferably 30 to 160 degrees, more preferably 50 to 160 degrees, even more preferably 70 to 160 degrees, even more preferably 90 to 150 degrees, and most preferably 120 to 150 degrees. If angle A is within the above range, the workability of the mortar is further improved. When the metal fiber 10 has multiple deformed portions 2, the respective angles A may be the same or different.
金属繊維１０の全長は、１５～５０ｍｍであることが好ましく、２０～４５ｍｍであることがより好ましく、２５～４０ｍｍであることが更に好ましい。金属繊維１０の全長が上記範囲内であれば、モルタルの混練性及び作業性が更に向上する。 The total length of the metal fibers 10 is preferably 15 to 50 mm, more preferably 20 to 45 mm, and even more preferably 25 to 40 mm. If the total length of the metal fibers 10 is within the above range, the kneadability and workability of the mortar are further improved.
金属繊維１０のアスペクト比（全長／直径）は２５～１５０であることが好ましく、３０～１００であることがより好ましく、４０～６５であることが更に好ましい。アスペクト比が上記範囲内であれば、モルタルの混練性及び作業性が一層向上し、ダレが生じにくくなる。 The aspect ratio (total length/diameter) of the metal fibers 10 is preferably 25 to 150, more preferably 30 to 100, and even more preferably 40 to 65. If the aspect ratio is within the above range, the kneadability and workability of the mortar are further improved, and sagging is less likely to occur.
金属繊維１０は、金属製であれば特に限定されず、例えば、鋼繊維、ステンレス繊維、アモルファス金属繊維、及びそれらの表面に化学的・物理的な処理を施したもの等が挙げられる。金属繊維１０としては、モルタルの混練性及び硬化性状の両立という観点から、鋼繊維が好ましい。金属繊維１０は、一種を単独で用いてもよく、二種以上を併せて用いてもよい。 The metal fibers 10 are not particularly limited as long as they are made of metal, and examples include steel fibers, stainless steel fibers, amorphous metal fibers, and fibers whose surfaces have been subjected to chemical or physical treatment. From the viewpoint of achieving both the kneadability and hardening properties of the mortar, steel fibers are preferred as the metal fibers 10. One type of metal fiber 10 may be used alone, or two or more types may be used in combination.
金属繊維１０の含有量は、結合材１００質量部に対し、１～２４質量部である。金属繊維１０の含有量が上記範囲外であると、金属繊維１０の分散性や初期強度発現性が低下する。金属繊維１０の分散性と強度発現性を両立させやすいという観点から、金属繊維１０の含有量は、結合材１００質量部に対し、２～１５質量部であることがより好ましく、３～１０質量部であることが更に好ましい。 The content of the metal fibers 10 is 1 to 24 parts by mass relative to 100 parts by mass of the binder. If the content of the metal fibers 10 is outside the above range, the dispersibility and initial strength development of the metal fibers 10 will decrease. From the viewpoint of easily achieving both the dispersibility and strength development of the metal fibers 10, the content of the metal fibers 10 is more preferably 2 to 15 parts by mass, and even more preferably 3 to 10 parts by mass relative to 100 parts by mass of the binder.
本実施形態の繊維補強モルタル組成物は、上記成分以外に、細骨材、膨張材、減水剤、凝結遅延剤等を含んでもよい。 The fiber-reinforced mortar composition of this embodiment may contain fine aggregate, expansive material, water reducing agent, setting retarder, etc. in addition to the above components.
細骨材は特に限定されず、川砂、珪砂、砕砂、寒水石、石灰石砂、スラグ骨材、軽量骨材等が挙げられる。これらの細骨材は、一種を単独で用いてもよく、二種以上を併せて用いてもよい。 The fine aggregate is not particularly limited, and examples thereof include river sand, silica sand, crushed sand, kansui stone, limestone sand, slag aggregate, lightweight aggregate, etc. These fine aggregates may be used alone or in combination of two or more types.
細骨材の含有量は、結合材１００質量部に対し、１００～４００質量部であることが好ましく、１５０～３５０質量部であることがより好ましく、２００～３００質量部であることが更に好ましい。細骨材の含有量が上記範囲内であると、十分な圧縮強度と割裂引張強度を両立しやすい。 The content of fine aggregate is preferably 100 to 400 parts by mass, more preferably 150 to 350 parts by mass, and even more preferably 200 to 300 parts by mass, per 100 parts by mass of binder. If the content of fine aggregate is within the above range, it is easy to achieve both sufficient compressive strength and splitting tensile strength.
繊維補強モルタル組成物が膨張材を含むことで、モルタルの圧縮強度及び寸法変化率が優れたものとなる。膨張材は、コンクリート用膨張材として一般に使用されているＪＩＳ適合の膨張材（ＪＩＳ Ａ ６２０２：２００８）であれば、何れの膨張材でもかまわない。膨張材としては、例えば、遊離生石灰を主成分とする膨張材（生石灰系膨張材）、アウインを主成分とする膨張材（エトリンガイト系膨張材）、遊離生石灰とエトリンガイト生成物質の複合系膨張材が挙げられる。膨張材は、一種を単独で用いてもよく、二種以上を併せて用いてもよい。膨張材はブレーン比表面積が２０００～６０００ｃｍ２／ｇのものを使用することが好ましい。 The fiber-reinforced mortar composition contains an expansive material, which provides the mortar with excellent compressive strength and dimensional change rate. The expansive material may be any expansive material conforming to JIS (JIS A 6202:2008) that is generally used as an expansive material for concrete. Examples of the expansive material include an expansive material mainly composed of free quicklime (quicklime-based expansive material), an expansive material mainly composed of auin (ettringite-based expansive material), and a composite expansive material of free quicklime and ettringite-forming material. The expansive material may be used alone or in combination of two or more kinds. It is preferable to use an expansive material having a Blaine specific surface area of 2000 to 6000 cm 2 /g.
膨張材の含有量は、結合材１００質量部に対し、０．１～５質量部であることが好ましく、０．５～４質量部であることがより好ましく、１～３質量部であることが更に好ましい。膨張材の含有量が上記範囲内であれば、圧縮強度、寸法変化率等がより一層優れたものとなる。 The content of the expansion agent is preferably 0.1 to 5 parts by mass, more preferably 0.5 to 4 parts by mass, and even more preferably 1 to 3 parts by mass, per 100 parts by mass of the binder. If the content of the expansion agent is within the above range, the compressive strength, dimensional change rate, etc. will be even better.
減水剤は、高性能減水剤、高性能ＡＥ減水剤、ＡＥ減水剤及び流動化剤を含む。このような減水剤としては、ＪＩＳ Ａ ６２０４：２０１１「コンクリート用化学混和剤」に規定される減水剤が挙げられる。減水剤としては、例えば、ポリカルボン酸系減水剤、ナフタレンスルホン酸系減水剤、リグニンスルホン酸系減水剤、メラミン系減水剤が挙げられる。これらの減水剤の中でも、少量の添加量であっても流動性保持時間を確保しやすいという観点から、ポリカルボン酸系減水剤が好ましい。減水剤は、一種を単独で用いてもよく、二種以上を併せて用いてもよい。 The water-reducing agent includes a high-performance water-reducing agent, a high-performance AE water-reducing agent, an AE water-reducing agent, and a superplasticizer. Examples of such water-reducing agents include those specified in JIS A 6204:2011 "Chemical admixtures for concrete". Examples of water-reducing agents include polycarboxylic acid-based water-reducing agents, naphthalene sulfonic acid-based water-reducing agents, lignin sulfonic acid-based water-reducing agents, and melamine-based water-reducing agents. Among these water-reducing agents, polycarboxylic acid-based water-reducing agents are preferred from the viewpoint that it is easy to ensure fluidity retention time even with a small amount added. The water-reducing agents may be used alone or in combination of two or more types.
減水剤の含有量は、結合材１００質量部に対し、０．１～５質量部であることが好ましく、０．２～３質量部であることがより好ましく、０．３～１質量部であることが更に好ましい。減水剤の含有量が上記範囲内であれば、可使時間を確保しやすく、流動性がより一層向上する。 The content of the water reducing agent is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 3 parts by mass, and even more preferably 0.3 to 1 part by mass, per 100 parts by mass of the binder. If the content of the water reducing agent is within the above range, it is easier to ensure the pot life and the fluidity is further improved.
繊維補強モルタル組成物が凝結遅延剤を含むことで、夏場等ポリマーセメントモルタルの練り上り温度が高くなる場合においても、可使時間を確保しやすい。凝結遅延剤としては、例えば、クエン酸、グルコン酸、リンゴ酸、酒石酸等の有機酸又はその塩；ホウ酸、ホウ酸ナトリウム等のホウ酸塩、リン酸塩、アルカリ金属炭酸塩、アルカリ金属重炭酸塩等の無機塩；糖類が挙げられる。これらの中でも、クエン酸、クエン酸塩、酒石酸、酒石酸塩、アルカリ金属炭酸塩が好ましい。凝結遅延剤は、粉体であってもよく、液状体（例えば、水溶液、エマルジョン、懸濁液の形態）であってもよい。凝結遅延剤は、一種を単独で用いてもよく、二種以上を併せて用いてもよい。 By including a retarder in the fiber-reinforced mortar composition, it is easy to ensure a sufficient working time even when the mixing temperature of the polymer cement mortar is high, such as in summer. Examples of retarders include organic acids or salts thereof, such as citric acid, gluconic acid, malic acid, and tartaric acid; inorganic salts, such as boric acid, borates such as sodium borate, phosphates, alkali metal carbonates, and alkali metal bicarbonates; and sugars. Among these, citric acid, citrates, tartaric acid, tartrates, and alkali metal carbonates are preferred. The retarder may be in the form of a powder or a liquid (for example, an aqueous solution, emulsion, or suspension). One type of retarder may be used alone, or two or more types may be used in combination.
凝結遅延剤の含有量は、結合材１００質量部に対し、０．１～７．５質量部であることが好ましく、０．３～５質量部であることがより好ましく、０．５～３．５質量部であることが最も好ましい。凝結遅延剤の含有量が上記範囲内であれば、可使時間を更に確保しやすく、初期強度発現性が低下しにくい。 The content of the setting retarder is preferably 0.1 to 7.5 parts by mass, more preferably 0.3 to 5 parts by mass, and most preferably 0.5 to 3.5 parts by mass, per 100 parts by mass of the binder. If the content of the setting retarder is within the above range, it is easier to ensure a longer pot life and the initial strength development is less likely to decrease.
本実施形態の繊維補強モルタル組成物には、本発明の効果が損なわれない範囲で各種混和材料を配合してもよい。混和材料としては、例えば、発泡剤、消泡剤、増粘剤、セメント用ポリマー、防水材、防錆剤、収縮低減剤、保水剤、顔料、繊維、撥水剤、白華防止剤、急結剤（材）、急硬剤（材）、石粉、火山灰、空気連行剤、表面硬化剤が挙げられる。 Various admixtures may be blended into the fiber-reinforced mortar composition of this embodiment as long as the effects of the present invention are not impaired. Examples of admixtures include foaming agents, defoamers, thickeners, cement polymers, waterproofing materials, rust inhibitors, shrinkage reducing agents, water retention agents, pigments, fibers, water repellents, efflorescence prevention agents, quick-setting agents (materials), quick-hardening agents (materials), stone powder, volcanic ash, air entraining agents, and surface hardeners.
本実施形態の繊維補強モルタル組成物を製造する方法は、特に限定されず、例えば、Ｖ型混合機や可傾式コンクリートミキサー等の重力式ミキサー、ヘンシェル式ミキサー、噴射型ミキサー、リボンミキサー、パドルミキサー等のミキサーにより上記成分を混合することで製造することができる。 The method for producing the fiber-reinforced mortar composition of this embodiment is not particularly limited, and can be produced by mixing the above components using a mixer such as a gravity mixer, a V-type mixer or a tilting concrete mixer, a Henschel mixer, a jet mixer, a ribbon mixer, or a paddle mixer.
本実施形態の繊維補強モルタル組成物は、水と混合して繊維補強モルタルとして調製することができ、その水の含有量は用途に応じて適宜調整すればよい。水の含有量は、結合材１００質量部に対して２０～４５質量部であることが好ましく、２２～４０質量部であることがより好ましく、２５～３５質量部であることが更に好ましい。水の含有量が上記範囲内であれば、金属繊維の混練性、並びに、初期及び長期の強度発現性がより一層優れたものとなる。 The fiber-reinforced mortar composition of this embodiment can be mixed with water to prepare a fiber-reinforced mortar, and the water content can be adjusted appropriately depending on the application. The water content is preferably 20 to 45 parts by mass, more preferably 22 to 40 parts by mass, and even more preferably 25 to 35 parts by mass, per 100 parts by mass of binder. If the water content is within the above range, the kneadability of the metal fibers and the initial and long-term strength development will be even more excellent.
本実施形態の繊維補強モルタルの調製は、通常のモルタル組成物と同様の混練器具を使用することができ、特に限定されるものではない。混練器具としては、例えば、モルタルミキサー、ハンドミキサー、傾胴ミキサー、二軸ミキサー、パン型ミキサー等が挙げられる。 The fiber-reinforced mortar of this embodiment can be prepared using the same kneading equipment as that used for ordinary mortar compositions, and is not particularly limited. Examples of kneading equipment include a mortar mixer, a hand mixer, a tilting mixer, a twin-shaft mixer, and a pan mixer.
本実施形態の繊維補強モルタル組成物及び繊維補強モルタルは、高強度のモルタルでありながら、金属繊維の分散性に優れるものである。したがって、高い強度発現性が求められる各種構造物や現場の補修・補強に好適に用いることができる。その施工方法は特に限定されず、型枠を作り充填する方法、コテ塗り、振動機を用いて敷き均す方法等が選択できる。 The fiber-reinforced mortar composition and fiber-reinforced mortar of this embodiment are high-strength mortars with excellent dispersibility of metal fibers. Therefore, they can be suitably used for repair and reinforcement of various structures and on-site structures that require high strength. The construction method is not particularly limited, and can be selected from methods such as making a formwork and filling it, applying it with a trowel, and spreading it evenly using a vibrator.
以下、本発明の実施例に基づいて説明するが、本発明がこれらに限定されるものではない。 The following describes the present invention based on examples, but the present invention is not limited to these.
［材料］
・セメント（Ｃ）：早強ポルトランドセメント
・カルシウムアルミネート類（ＣＡ）：ＣａＯ／Ａｌ２Ｏ３＝１．４、ガラス化率：４０％、ブレーン比表面積：５０００ｃｍ２／ｇ
・石膏類（ＣＳ）：無水石膏、ブレーン比表面積：７０００ｃｍ２／ｇ
・ポゾラン物質（ＳＦ）：シリカフューム、ＢＥＴ比表面積：１５ｍ２／ｇ
・金属繊維１：鋼繊維、全長：３０ｍｍ、アスペクト比：４５、形状：図１（ｅ）に示される形状、全長に対する略直線部の割合：７７％、それぞれの角度Ａ：１５０度
・金属繊維２：鋼繊維、全長：３０ｍｍ、アスペクト比：４５、形状：直線状
・細骨材：珪砂（粒度調整済み）
・膨張材：生石灰系膨張材、ブレーン比表面積：３２００ｃｍ２／ｇ
・減水剤：ポリカルボン酸系高性能減水剤
・凝結遅延剤：クエン酸
[material]
Cement (C): High-early-strength Portland cement Calcium aluminates (CA): CaO/Al 2 O 3 =1.4, vitrification rate: 40%, Blaine specific surface area: 5000 cm 2 /g
・Gypsum (CS): Anhydrite, Blaine specific surface area: 7000cm 2 /g
Pozzolanic substance (SF): Silica fume, BET specific surface area: 15 m 2 /g
Metal fiber 1: steel fiber, total length: 30 mm, aspect ratio: 45, shape: shape shown in FIG. 1(e), proportion of approximately straight line portion to total length: 77%, respective angle A: 150 degrees Metal fiber 2: steel fiber, total length: 30 mm, aspect ratio: 45, shape: straight Fine aggregate: silica sand (grain size adjusted)
Expansion material: quicklime-based expansion material, Blaine specific surface area: 3200 cm 2 /g
・Water reducing agent: Polycarboxylic acid-based high performance water reducing agent ・Set retarder: Citric acid
［繊維補強モルタル組成物の配合設計］
セメント、カルシウムアルミネート類、石膏類及びポゾラン物質からなる結合材を表１に示す割合とし、結合材１００質量部に対して、表１に示す含有量及び種類の金属繊維、細骨材２７０質量部、膨張材１．５質量部、減水剤０．５質量部、凝結遅延剤０．６質量部として配合設計した。なお、Ｎｏ．６の繊維補強モルタル組成物は参考例とする。
[Mixing design of fiber-reinforced mortar composition]
The binders consisting of cement, calcium aluminates, gypsums, and pozzolanic substances were mixed in the proportions shown in Table 1, and the amounts and types of metal fibers, fine aggregate, expansive material, water reducing agent, and retarder were mixed in the proportions shown in Table 1, with respect to 100 parts by weight of binder. The fiber-reinforced mortar composition No. 6 is a reference example.
［結合材の強熱減量］
調製した結合材を、乾燥又は湿潤させて強熱減量を調整した。
強熱減量は、空焼きしたるつぼに結合材試料１ｇを量り取り、７００℃に調整した電気炉に置き、１５分間強熱し、強熱前後の重量変化から強熱減量を算出した。
[Ignition loss of binder]
The prepared binder was dried or wetted to adjust the loss on ignition.
The ignition loss was calculated by weighing 1 g of the binder sample into an empty crucible, placing it in an electric furnace adjusted to 700° C., and igniting for 15 minutes, and calculating the ignition loss from the change in weight before and after ignition.
［繊維補強モルタルの作製］
２０℃環境下において、結合材１００質量部に対して水が３０質量部の割合となるように各種繊維補強モルタル組成物に水を添加し、強制練りミキサーで１２０秒混練してモルタルを約２５Ｌ作製した。
[Preparation of fiber-reinforced mortar]
In an environment of 20° C., water was added to each of the fiber-reinforced mortar compositions so that the ratio of water was 30 parts by mass per 100 parts by mass of binder, and the mixture was mixed in a forced mixer for 120 seconds to produce approximately 25 L of mortar.
［評価方法］
各項目については以下の方法で評価した。評価結果を表２に示す。
１）フレッシュ性状
ａ）分散性
繊維補強モルタルを強制練りミキサーにて作製する際、金属繊維の固まり等の発生により均一に金属繊維が分散されていない場合を不良（×）と評価し、均一に金属繊維が分散されていることが確認された場合を良好（○）と評価した。
ｂ）ダレ性状
コンクリート平板（３００×３００×６０ｍｍ）を勾配５％の状態に設置し、繊維補強モルタルを厚さ２０ｍｍ施工した後コテで均して、ダレ性状を目視観察した。ダレが生じたものを不良（×）と評価し、ダレを生じなかったものを良好（○）と評価した。
２）圧縮強度
土木学会基準ＪＳＣＥ－Ｇ ５０５０－２０１０「円柱供試体を用いたモルタルまたはセメントペーストの圧縮強度試験方法（案）」に準じて、材齢３時間及び２８日における圧縮強度を測定した。供試体の寸法は、直径５０ｍｍ及び高さ１００ｍｍとした。材齢２８日の供試体は翌日に脱型した後、材齢日まで水中で養生した。養生は常に２０℃の恒温槽内で行った。
[Evaluation method]
Each item was evaluated by the following method. The evaluation results are shown in Table 2.
1) Fresh Properties a) Dispersibility When fiber-reinforced mortar was prepared using a forced mixing mixer, cases in which the metal fibers were not uniformly dispersed due to the generation of lumps of the metal fibers, etc., were evaluated as poor (×), and cases in which it was confirmed that the metal fibers were uniformly dispersed were evaluated as good (◯).
b) Sagging A concrete slab (300 x 300 x 60 mm) was placed on a 5% gradient, and fiber-reinforced mortar was applied to a thickness of 20 mm, which was then leveled with a trowel. Sagging was visually observed. Sagging was evaluated as poor (x), and no sagging was evaluated as good (o).
2) Compressive strength The compressive strength was measured at 3 hours and 28 days according to the Japan Society of Civil Engineers standard JSCE-G 5050-2010 "Method of compressive strength test for mortar or cement paste using cylindrical specimen (draft)". The dimensions of the specimen were 50 mm in diameter and 100 mm in height. The 28-day-old specimen was demolded the next day and cured in water until the age of the specimen. Curing was always performed in a thermostatic chamber at 20°C.
１０ 金属繊維、１ 略直線部、２ 変形部、３ 始点、４ 終点、Ａ 角度 10 Metal fiber, 1 Approximately straight section, 2 Deformed section, 3 Starting point, 4 End point, A Angle
Claims (4)
前記結合材の強熱減量が、０．７～６．４質量％であり、
前記セメントの含有量が、前記結合材１００質量部に対し、５５～８０質量部であり、
前記カルシウムアルミネート類の含有量が、前記結合材１００質量部に対し、１０～１８質量部であり、
前記石膏類の含有量が、前記結合材１００質量部に対し、６．５～２３質量部であり、
前記ポゾラン物質の含有量が、前記結合材１００質量部に対し、１～２４質量部であり、
前記金属繊維の含有量が、前記結合材１００質量部に対し、１～２４質量部であり、
前記金属繊維が、略直線部と、前記金属繊維の少なくとも一方の端部から前記略直線部と３０～１６０度の角度を有するように折り曲げて形成された変形部とを有し、前記金属繊維の全長が、２５～４０ｍｍであり、且つ前記金属繊維のアスペクト比が、４０～６５である、繊維補強モルタル組成物。 The present invention relates to a cement-based concrete structure, and more particularly to a concrete structure comprising a binder comprising cement, calcium aluminates, gypsums, and pozzolanic materials, and metal fibers;
The ignition loss of the binder is 0.7 to 6.4% by mass,
The content of the cement is 55 to 80 parts by mass relative to 100 parts by mass of the binder,
The content of the calcium aluminates is 10 to 18 parts by mass relative to 100 parts by mass of the binder,
The content of the gypsum is 6.5 to 23 parts by mass relative to 100 parts by mass of the binder,
The content of the pozzolanic substance is 1 to 24 parts by mass per 100 parts by mass of the binder,
The content of the metal fiber is 1 to 24 parts by mass relative to 100 parts by mass of the binder,
A fiber-reinforced mortar composition, wherein the metal fibers have a substantially straight portion and a deformed portion formed by bending at least one end of the metal fibers at an angle of 30 to 160 degrees from the substantially straight portion , the total length of the metal fibers is 25 to 40 mm, and the aspect ratio of the metal fibers is 40 to 65 .
前記水の含有量が、前記結合材１００質量部に対し、２０～４５質量部である、繊維補強モルタル。 A fiber-reinforced mortar composition according to any one of claims 1 to 3 and water,
The fiber-reinforced mortar has a water content of 20 to 45 parts by mass per 100 parts by mass of the binder.
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