JP3569656B2 - Concrete composition - Google Patents
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- JP3569656B2 JP3569656B2 JP31296999A JP31296999A JP3569656B2 JP 3569656 B2 JP3569656 B2 JP 3569656B2 JP 31296999 A JP31296999 A JP 31296999A JP 31296999 A JP31296999 A JP 31296999A JP 3569656 B2 JP3569656 B2 JP 3569656B2
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- slag
- steelmaking slag
- aggregate component
- coarse aggregate
- concrete composition
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- 239000004567 concrete Substances 0.000 title claims description 36
- 239000000203 mixture Substances 0.000 title claims description 31
- 239000002893 slag Substances 0.000 claims description 75
- 238000009628 steelmaking Methods 0.000 claims description 47
- 239000002245 particle Substances 0.000 claims description 21
- 239000004568 cement Substances 0.000 claims description 16
- 239000010883 coal ash Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000007654 immersion Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000009472 formulation Methods 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 239000011372 high-strength concrete Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- -1 alum Chemical compound 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 239000011400 blast furnace cement Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、コンクリート組成物に関し、詳しくは、製鋼スラグを粗骨材として含有し、高強度のコンクリート構造物を与え得るコンクリート組成物に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
コンクリートは、セメント、粗骨材、細骨材等からなり、該粗骨材としては、砂利、砕石、高炉スラグ粗骨材等が用いられている。
【０００３】
製鋼スラグは、高炉スラグと同じく製鉄過程において生じるスラグであるが、膨張崩壊性を有するために、その用途は、例えば路盤材や土質改良材等の膨張が致命的な欠陥とならないような用途に限られていた。
近年、斯かる製鋼スラグの新たな活用方法を提供するものとして、５ｍｍ以下に粒度調整した製鋼スラグを、コンクリート用の細骨材として利用する方法が提案されているが、製鋼スラグを、粗骨材として製鋼スラグを有効に利用する方法については未だ提案されていない。
【０００４】
従って、本発明は、製鋼スラグを粗骨材として含有し、高強度のコンクリート構造物を与え得るコンクリート組成物を提供することにある。
【０００５】
【課題を解決するための手段】
本発明は、製鋼スラグと、石炭灰と、セメントと、水とを配合してなるコンクリート組成物であって、前記製鋼スラグは、粒径５ｍｍ超の粗骨材成分と、粒径５ｍｍ以下の細骨材成分とからなり、前記石炭灰と該製鋼スラグとの配合割合が、容量比（石炭灰：製鋼スラグ）で２０：８０〜３５：６５であり、前記粗骨材成分と前記細骨材成分との質量比（粗骨材成分：細骨材成分）が、２０：８０〜８０：２０であり、前記製鋼スラグの水浸膨張比が、０．５以下であることを特徴とするコンクリート組成物を提供することにより、上記の目的を達成したものである。
また、本発明は、上記のコンクリート組成物の製造方法であって、前記製鋼スラグを配合するに際し、前記粗骨材成分と前記細骨材成分との混合物を用いることを特徴とするコンクリート組成物の製造方法を提供するものである。
【０００６】
【発明の実施の形態】
以下、本発明の細骨材について詳細に説明する。
本発明のコンクリート組成物は、製鋼スラグと、石炭灰と、セメントと、水とを配合してなる。
製鋼スラグとしては、製鋼工程で生じるスラグであれば特に制限なく使用することができ、転炉スラグ及び電気炉スラグの何れでも良いが、転炉スラグであることが好ましい。
【０００７】
本発明では、製鋼スラグとして、粒径５ｍｍ超の粗骨材成分と、粒径５ｍｍ以下の細骨材成分とを用いる。ここで、粒径５ｍｍ超の粗骨材成分とは、５ｍｍ網ふるいを通過しない砂利状の製鋼スラグを意味し、粒径５ｍｍ以下の細骨材成分とは、５ｍｍ網ふるいを通過する砂又は微粉状の製鋼スラグを意味する。
粒径５ｍｍ超の粗骨材成分を、粒径５ｍｍ以下の細骨材成分及び後述する石炭灰と共に用いることにより、コンクリートの膨張崩壊が効果的に抑制され、それによって、クラックが発生しない高強度のコンクリート構造物を得ることができる。
【０００８】
前記粗骨材成分と前記細骨材成分との質量比（粗骨材成分：細骨材成分）は、クラックの発生しない、高強度のコンクリートを得る観点から、２０：８０〜８０：２０であり、３０：７０〜７０：３０であることが好ましい。
また、製鋼スラグは、粗骨材成分と細骨材成分とが混合された状態下に測定した水浸膨張比が、０．５％以下である。
製鋼スラグの水浸膨張比が、０．５％を超えると、耐久性を判断するための指標であるオートクレーブ養生後の圧縮強度が低くなる。
【０００９】
ここで、水浸膨張比は、ＪＩＳ Ａ ５０１５：１９９２ 付属書２に規定された鉄鋼スラグの水浸膨張試験方法に準拠して測定することができる。尚、蒸気エージングの方法としては、製鋼スラグを常圧又は加圧下において水蒸気に曝す方法がある。
【００１０】
製鋼スラグの細骨材成分は、粒径が０．１５ｍｍ未満の微粉状成分の含有率が質量比で２０％未満、特に１２％未満であることが好ましい。
【００１１】
製鋼スラグは、粗骨材成分と細骨材成分との混合物を用いることが好ましい。即ち、例えば２０ｍｍ網ふるいを通過する製鋼スラグの破砕物を、粒径５ｍｍ超の製鋼スラグと５ｍｍ以下の製鋼スラグとにふるい分けしたものを、それぞれ粗骨材成分及び細骨材成分として用いても良いが、ふるい分けする前の両者が混合された状態のものを用いることにより、ふるい分け及び再混合の負担が低減され、コンクリート組成物の製造コスト、延いては各種コンクリート構造物の製造コストの低減を図ることができる。
【００１２】
石炭灰としては、フライアッシュ、シンダーアッシュ等を使用することができる。これらの中でも、フライアッシュが好ましく、フライアッシュを用いると、特に高強度のコンクリートを得ることができる。尚、石炭灰は、その一種を単独で使用しても良いし二種以上を組み合わせて使用しても良い。
【００１３】
石炭灰と製鋼スラグ（粗骨材成分と細骨材成分との総量）との配合割合は、容量比（石炭灰：製鋼スラグ）で２０：８０〜３５：６５であり、好ましくは２５：７５〜３０：７０である。
石炭灰の配合割合が１５：８５より少ないと、オートクレーブ養生を行った場合に、高強度のコンクリートを得ることが困難であり、逆に５０：５０を超えると適正なウォーカビリティを得ることが困難になる。
【００１４】
セメントとしては、土木建築分野で使用される通常公知の各種のセメントを使用することができるが、高炉スラグ又はフライアッシュで置換した高炉スラグセメント又はフライアッシュセメントを好ましく使用することができる。特に、高炉セメントでは置換率３０〜６０％のＢ種、フライアッシュセメントでは置換率１０〜２０％のＢ種のセメントが好ましい。
セメントの配合割合は、目的とする強度等に応じて適宜に決定することができる。
【００１５】
本発明のコンクリート組成物には、製鋼スラグ、石炭灰、セメント及び水の他に、必要に応じて高炉スラグ粗骨材や各種の混和材料を含有させて使用しても良い。
高炉スラグ粗骨材は、製鋼スラグの有効活用を図る観点からは配合しない方が良いが、必要に応じて加えても良い。特に、使用しようとする製鋼スラグの粗骨材成分と細骨材成分との比率を調べた結果、該粗骨材の比率が少ない場合には、その不足分を高炉スラグ粗骨材で容易に補うことができる。高炉スラグ粗骨材としては、ＪＩＳ規格品の標準的な徐冷スラグ（ＪＩＳ Ａ ５０１１）等を使用することができる。
【００１６】
混和材料としては、界面活性剤（ＡＥ剤，拡散剤）や、珪酸白土、けいそう土、火山灰等の可溶性珪酸を含む耐海水性剤、炭酸ソーダ、水ガラス、明ばん、塩化石灰等の急結剤等を挙げることができる。尚、これらの混和材料は、その一種を単独で配合しても二種以上を組合せて配合しても良い。
【００１７】
コンクリート組成物の材料、即ち、製鋼スラグ、石炭灰、水、セメント及び必要に応じて配合される高炉スラグ粗骨材、混和材料等を混合する順序には特に制限はなく、従来の方法におけるのと同様にして混合することができる。また、混合には、ドラムミキサー、可傾式ミキサー、強制練りミキサー等従来公知の各種の混練装置を用いることができる。
そして、本発明のコンクリート組成物は、従来公知のコンクリート組成物と同様にして、各種コンクリート構造物の築造に使用することができる。
【００１８】
【実施例】
＜配合試験＞
表１に示す配合割合で、水、セメント、製鋼スラグ、高炉スラグ、フライアッシュ、混和剤、補助剤を混合し、コンクリート組成物を得た。
【００１９】
【表１】
使用した製鋼スラグを以下に示す。
製鋼スラグ：蒸気エージングを行い、ふるい分けたものを用いた〔住友金属工業（株）鹿島製鉄所製〕。表１中、５〜０は、その全量が５ｍｍのふるいを通過する製鋼スラグ細骨材を意味し、１０〜０は、粒径５〜０ｍｍの製鋼スラグ（細骨材成分）と粒径１０〜５ｍｍの製鋼スラグ（粗骨材成分）との混合物を意味する。同様に、１５〜０は、粒径５〜０ｍｍの製鋼スラグ（細骨材成分）と粒径１５〜５ｍｍの製鋼スラグ（粗骨材成分）との混合物、２０〜０は、粒径５〜０ｍｍの製鋼スラグ（細骨材成分）と粒径２０〜５ｍｍの製鋼スラグ（粗骨材成分）との混合物である。表２に、各製鋼スラグ及び後述の高炉スラグ粗骨材の水浸膨張比、粒度分布等を示した。
【００２１】
【表２】
使用した製鋼スラグ以外の材料を以下に示す。
高炉スラグ：高炉スラグ粗骨材〔住友金属工業（株）鹿島製鉄所製、「２００５Ｎ」，密度２．６０）
フライアッシュ：常盤共同火力（株）、密度２．１７
セメント：高炉セメントＢ種（日立セメント（株）製、密度３．０５）
混和剤：（株）ＮＭＢ製、商品名「ポゾリス No. ７０」
補助剤：空気調整剤〔（株）ＮＭＢ製、商品名「ポゾリス No. 775S」〕
尚、表１中、粗骨材容積比とは、粒径５ｍｍ以下の部分（表２参照，全体の１４％）も含めた高炉スラグ粗骨材の全量と、製鋼スラグの内の粒径５ｍｍ超の粗骨材成分との容積比である。また、フライアッシュ比率とは、フライアッシュ(FA)の容積と製鋼スラグ(Sg)の容積との合計に対するフライアッシュの容積比〔％，(FA/(FA+Sg) 〕である。また、コンクリートの設計基準強度は１６Ｎ／ｍｍ2 を配合目標値とした。
【００２３】
＜評価＞
（１）フレッシュコンクリートの性状
配合の結果得られた各コンクリート組成物について、スランプ試験（ＪＩＳ Ａ １１０１に準拠）、空気量の測定（ＪＩＳ Ａ １１２８に準拠）、単位容積質量の測定（ＪＩＳ Ａ １１２８に準拠〕、ブリージング量の測定（ＪＩＳ Ａ １１２３に準拠）を行い、それらの結果を表３に示した。
【００２４】
【表３】
（２）圧縮強度
硬化したコンクリートについて圧縮強度の評価を行い、その結果を表３に示した。圧縮強度の評価は、ＪＩＳ Ａ １１３２に準拠して製造した強度試験用供試体を標準水中養生し、材令７日（σ７ ）及び２８日（σ２８）における各供試体について圧縮強度を測定して行った。圧縮強度の測定は、ＪＩＳ Ａ １１０８に規定される「コンクリートの圧縮強度試験方法」に準拠して行った。
【００２６】
（３）崩壊試験
製鋼スラグの膨脹崩壊によるコンクリートの崩壊の有無を調べるために、成形１日後のコンクリートを１８０℃，１０気圧の高温高圧の蒸気中に２４時間放置してオートクレーブ養生を行った。評価は、オートクレーブ処理後の供試体について上記と同様に圧縮強度を測定して行った。その結果を表３に示した。
【００２７】
オートクレーブ処理の結果、実施例の配合においては、オートクレーブ処理後においても正常と考えられる圧縮強度を示し、本発明のコンクリート組成物を用いれば、長期間高強度を維持できるコンクリートが得られることが判る。
【００２８】
【発明の効果】
本発明のコンクリート組成物は、製鋼スラグを粗骨材として含有しているため、従来殆どが産業廃棄物として処理されていた製鋼スラグの有効活用を図ることができる。また、石炭灰についても有効利用を図ることができる。
【００２９】
また、本発明のコンクリート組成物を用いれば、オートクレーブ養生を行っても高圧縮強度が発現される高耐久性のコンクリート製品や構造物等を提供することができる。特に、波による衝撃や海水の侵食作用に強い構造物を築造することができる。また、本発明のコンクリート組成物は、防波堤の上部工、根固めブロック、消波ブロック等の港湾・海岸構造物の築造用に好適である。また、打設中における材料の分離が少なく、また、強度にムラがないコンクリート製品等を提供することができる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a concrete composition, and more particularly to a concrete composition containing steelmaking slag as a coarse aggregate and capable of providing a high-strength concrete structure.
[0002]
Problems to be solved by the prior art and the invention
Concrete is composed of cement, coarse aggregate, fine aggregate and the like, and as the coarse aggregate, gravel, crushed stone, blast furnace slag coarse aggregate and the like are used.
[0003]
Steelmaking slag is a slag generated in the iron making process like blast furnace slag, but because it has expansion and collapse properties, its use is, for example, in applications where expansion of roadbed material or soil improvement material does not become a fatal defect. Was limited.
In recent years, as a method of providing such a new utilization method of steelmaking slag, a method of using steelmaking slag whose grain size has been adjusted to 5 mm or less as fine aggregate for concrete has been proposed. A method of effectively using steelmaking slag as a material has not yet been proposed.
[0004]
Accordingly, an object of the present invention is to provide a concrete composition containing steelmaking slag as coarse aggregate and capable of providing a high-strength concrete structure.
[0005]
[Means for Solving the Problems]
The present invention comprises a steel slag, and coal ash, a concrete composition obtained by blending cement, and water, wherein the steel slag has a coarse aggregate component having a particle diameter of 5mm greater than the following particle size 5mm A fine aggregate component, wherein the mixing ratio of the coal ash and the steelmaking slag is 20:80 to 35:65 in terms of volume ratio (coal ash: steelmaking slag) , and the coarse aggregate component and the fine bone The mass ratio (coarse aggregate component: fine aggregate component) to the material component is 20:80 to 80:20, and the water immersion expansion ratio of the steelmaking slag is 0.5 or less. The above object has been achieved by providing a concrete composition.
The present invention also relates to the above-mentioned method for producing a concrete composition, wherein the steelmaking slag is compounded, wherein a mixture of the coarse aggregate component and the fine aggregate component is used. Is provided.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the fine aggregate of the present invention will be described in detail.
The concrete composition of the present invention comprises steelmaking slag, coal ash, cement, and water.
As the steelmaking slag, any slag generated in the steelmaking process can be used without any particular limitation. Either a converter slag or an electric furnace slag may be used, but a converter slag is preferred.
[0007]
In the present invention, as steel slag, and coarse aggregate component having a particle diameter of 5mm greater, and less fine material component particle size 5mm used. Here, the coarse aggregate component having a particle diameter of 5mm greater, means a gravel-like steelmaking slag that does not pass through the 5mm mesh sieve, and the particle diameter 5mm or less fine aggregate component, sand passes through a 5mm mesh sieve or It means fine steel slag.
By using a coarse aggregate component having a particle size of more than 5 mm together with a fine aggregate component having a particle size of 5 mm or less and coal ash to be described later, the expansion and collapse of concrete is effectively suppressed, thereby providing high strength without cracking. Concrete structure can be obtained.
[0008]
Mass ratio of the coarse aggregate component the fine aggregate component (coarse aggregate components: fine aggregate component), no occurrence of cracks, in view of obtaining a high-strength concrete, 20: 80 to 80: 20 Yes , and preferably 30:70 to 70:30.
Further, steelmaking slag, immersion expansion ratio measured under conditions in which the coarse aggregate component and the fine aggregate components are mixed, Ru der 0.5% or less.
When the water immersion expansion ratio of the steelmaking slag exceeds 0.5%, the compressive strength after autoclave curing, which is an index for judging durability, becomes low.
[0009]
Here, the water immersion expansion ratio can be measured according to the water immersion expansion test method for steel slag specified in Appendix 2 of JIS A 5015: 1992. In addition, as a method of steam aging, there is a method in which steelmaking slag is exposed to steam under normal pressure or under pressure.
[0010]
The fine aggregate component of the steelmaking slag preferably has a content of a fine powder component having a particle size of less than 0.15 mm in a mass ratio of less than 20%, particularly less than 12%.
[0011]
As the steelmaking slag, it is preferable to use a mixture of a coarse aggregate component and a fine aggregate component. That is, for example, a crushed product of steelmaking slag passing through a 20-mm mesh sieve, a steelmaking slag having a particle size of more than 5 mm and a steelmaking slag having a particle size of 5 mm or less may be used as a coarse aggregate component and a fine aggregate component, respectively. Good, but by using a mixture of both before sieving, the burden of sieving and remixing is reduced, and the production cost of concrete composition, and hence the production cost of various concrete structures, is reduced. Can be planned.
[0012]
Fly ash, cinder ash and the like can be used as the coal ash. Among them, fly ash is preferable, and particularly high strength concrete can be obtained by using fly ash. The coal ash may be used alone or in combination of two or more.
[0013]
The mixing ratio of the coal ash and the steel slag (the total amount of the coarse aggregate component and the fine aggregate components), volume ratio (Coal Ash: steel slag) at 2 0: 80 to 35: A 65, preferably 25: 75 to 30:70.
If the blending ratio of coal ash is less than 15:85, it is difficult to obtain high-strength concrete when autoclaving, and if it exceeds 50:50, it is difficult to obtain appropriate walkability. become.
[0014]
As the cement, various known cements used in the field of civil engineering can be used, but blast furnace slag cement or fly ash cement replaced with blast furnace slag or fly ash can be preferably used. In particular, blast furnace cement is preferably a B-type cement having a replacement ratio of 30 to 60%, and fly ash cement is preferably a B-type cement having a replacement ratio of 10 to 20%.
The mixing ratio of the cement can be appropriately determined according to the desired strength and the like.
[0015]
The concrete composition of the present invention may contain blast furnace slag coarse aggregate and various admixtures, if necessary, in addition to steelmaking slag, coal ash, cement and water.
It is better not to mix blast furnace slag coarse aggregate from the viewpoint of effective utilization of steelmaking slag, but it may be added as necessary. In particular, as a result of examining the ratio of the coarse aggregate component and the fine aggregate component of the steelmaking slag to be used, when the ratio of the coarse aggregate is small, the shortage can be easily eliminated by the blast furnace slag coarse aggregate. I can make up for it. As the blast furnace slag coarse aggregate, JIS standard standard slow-cooled slag (JIS A 5011) or the like can be used.
[0016]
Examples of the admixture materials include surfactants (AE agents and diffusing agents), seawater-resistant agents containing soluble silicic acid such as clay silicate, diatomaceous earth, and volcanic ash; sodium carbonate, water glass, alum, and chloride lime. Binders and the like can be mentioned. These admixtures may be used alone or in combination of two or more.
[0017]
There are no particular restrictions on the order of mixing the concrete composition materials, i.e., steelmaking slag, coal ash, water, cement, and optionally blended blast furnace slag coarse aggregate, admixture, etc. Can be mixed in the same manner as described above. For the mixing, conventionally known various kneading apparatuses such as a drum mixer, a tiltable mixer, and a forced kneading mixer can be used.
And the concrete composition of this invention can be used for construction of various concrete structures similarly to the conventionally well-known concrete composition.
[0018]
【Example】
<Formulation test>
Water, cement, steelmaking slag, blast furnace slag, fly ash, admixture, and adjuvant were mixed at the mixing ratio shown in Table 1 to obtain a concrete composition.
[0019]
[Table 1]
The steelmaking slag used is shown below.
Steelmaking slag: steam-aged and sieved (manufactured by Kashima Steel Works, Sumitomo Metal Industries, Ltd.). In Table 1, 5 to 0 means steelmaking slag fine aggregate whose total amount passes through a 5 mm sieve, and 10 to 0 means steelmaking slag (fine aggregate component) having a particle size of 5 to 0 mm and a particle size of 10 mm. It means a mixture with ５5 mm of steelmaking slag (coarse aggregate component). Similarly, 15 to 0 is a mixture of steelmaking slag (fine aggregate component) having a particle size of 5 to 0 mm and steelmaking slag (coarse aggregate component) having a particle size of 15 to 5 mm. It is a mixture of 0 mm steelmaking slag (fine aggregate component) and steelmaking slag (coarse aggregate component) having a particle size of 20 to 5 mm. Table 2 shows the water immersion expansion ratio, particle size distribution, and the like of each steelmaking slag and blast furnace slag coarse aggregate described below.
[0021]
[Table 2]
The materials other than the steelmaking slag used are shown below.
Blast furnace slag: Blast furnace slag coarse aggregate [manufactured by Kashima Steel Works, Sumitomo Metal Industries, Ltd., "2005N", density 2.60)
Fly ash: Tokiwa Kyodo Thermal Power Co., Ltd., density 2.17
Cement: Blast furnace cement B class (Hitachi Cement Co., Ltd., density 3.05)
Admixture: NMB Corp., trade name "Pozzolith No. 70"
Auxiliary agent: air conditioner [manufactured by NMB Co., Ltd., trade name "Pozzolith No. 775S"]
In Table 1, the coarse aggregate volume ratio refers to the total amount of the blast furnace slag coarse aggregate including the portion having a particle size of 5 mm or less (see Table 2, 14% of the whole), and the particle size of the steelmaking slag of 5 mm. This is the volume ratio with the extra coarse aggregate component. The fly ash ratio is the volume ratio of fly ash [%, (FA / (FA + Sg)]) to the sum of the volume of fly ash (FA) and the volume of steelmaking slag (Sg). The design standard strength was 16 N / mm 2 as the target blending value.
[0023]
<Evaluation>
(1) Slump test (according to JIS A 1101), measurement of air volume (according to JIS A 1128), and measurement of unit volume mass (JIS A 1128) for each concrete composition obtained as a result of mixing properties of fresh concrete ), And the amount of breathing was measured (based on JIS A 1123), and the results are shown in Table 3.
[0024]
[Table 3]
(2) Compressive strength The compressive strength of the hardened concrete was evaluated, and the results are shown in Table 3. The evaluation of the compressive strength is as follows. A test specimen for strength test manufactured in accordance with JIS A 1132 is cured in standard water, and the compressive strength is measured for each specimen at 7 days (σ 7 ) and 28 days (σ 28 ) of material age. I went. The measurement of the compressive strength was carried out in accordance with “Method for testing compressive strength of concrete” specified in JIS A 1108.
[0026]
(3) Collapse test In order to examine the presence or absence of concrete collapse due to the expansion and collapse of the steelmaking slag, the concrete after one day of molding was left in steam of 180 ° C. and 10 atm. The evaluation was performed by measuring the compressive strength of the specimen after the autoclave treatment in the same manner as described above. Table 3 shows the results.
[0027]
As a result of the autoclave treatment, in the formulations of the examples, the compressive strength considered to be normal even after the autoclave treatment is exhibited, and it is understood that the concrete composition of the present invention can provide concrete capable of maintaining high strength for a long time. .
[0028]
【The invention's effect】
Since the concrete composition of the present invention contains steelmaking slag as coarse aggregate, it is possible to effectively utilize steelmaking slag that has been conventionally mostly treated as industrial waste. Also, coal ash can be effectively used.
[0029]
Further, by using the concrete composition of the present invention, it is possible to provide a highly durable concrete product, structure, or the like which exhibits high compressive strength even after autoclaving. In particular, it is possible to construct a structure that is resistant to the impact of waves and the erosion of seawater. Further, the concrete composition of the present invention is suitable for construction of a harbor / shore structure such as a superstructure of a breakwater, a solidification block, a wave breaking block, and the like. In addition, it is possible to provide a concrete product or the like which has little separation of materials during casting and has no unevenness in strength.
Claims (2)
前記製鋼スラグは、粒径５ｍｍ超の粗骨材成分と、粒径５ｍｍ以下の細骨材成分とからなり、前記石炭灰と該製鋼スラグとの配合割合が、容量比（石炭灰：製鋼スラグ）で２０：８０〜３５：６５であり、
前記粗骨材成分と前記細骨材成分との質量比（粗骨材成分：細骨材成分）が、２０：８０〜８０：２０であり、
前記製鋼スラグの水浸膨張比が、０．５以下であることを特徴とするコンクリート組成物。A concrete composition comprising steelmaking slag, coal ash, cement, and water,
The steelmaking slag is composed of a coarse aggregate component having a particle diameter of 5mm greater than the particle diameter 5mm or less fine aggregate component, the mixing ratio between the coal ash and the formulation steel slag, volume ratio (Coal Ash: steel slag ) At 20:80 to 35:65,
A mass ratio between the coarse aggregate component and the fine aggregate component (coarse aggregate component: fine aggregate component) is 20:80 to 80:20,
A concrete composition, wherein the steelmaking slag has a water immersion expansion ratio of 0.5 or less .
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| KR20030060528A (en) * | 2002-01-09 | 2003-07-16 | 세연에스앤알 주식회사 | Cement concrete and mortar comprising steel-making slag |
| AU2003252317A1 (en) * | 2002-07-31 | 2004-02-16 | Taiheiyo Materials Corporation | Mortar or concrete |
| JP2004059396A (en) * | 2002-07-31 | 2004-02-26 | Taiheiyo Material Kk | Mortar and concrete |
| JP2007022869A (en) * | 2005-07-19 | 2007-02-01 | Okumura Corp | Curable composition |
| JP5828999B2 (en) * | 2009-04-22 | 2015-12-09 | 中国電力株式会社 | concrete |
| KR101225419B1 (en) * | 2009-06-26 | 2013-01-22 | 현대제철 주식회사 | Concrete composition comprising slag |
| KR101159914B1 (en) * | 2009-06-26 | 2012-06-25 | 현대제철 주식회사 | Concrete composition comprising slag |
| JP5870613B2 (en) * | 2011-10-17 | 2016-03-01 | 新日鐵住金株式会社 | Steelmaking slag hydrated hardened body and method for producing the same |
| KR101381261B1 (en) | 2012-08-28 | 2014-04-14 | 주식회사 메카 | Method for preparing scs concrete composition |
| JP5652924B2 (en) * | 2013-02-05 | 2015-01-14 | 株式会社ガイアートＴ・Ｋ | Concrete pavement structure |
| JP6079313B2 (en) * | 2013-03-04 | 2017-02-15 | 新日鐵住金株式会社 | Square block manufacturing method and rectangular block manufacturing system |
| JP5688505B2 (en) * | 2013-04-08 | 2015-03-25 | 株式会社ガイアートＴ・Ｋ | Concrete pavement structure |
| CN105016660A (en) * | 2015-07-13 | 2015-11-04 | 王培培 | High-toughness concrete composition |
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