JP3566385B2 - Method for producing hydraulic material and cured body - Google Patents
Method for producing hydraulic material and cured body Download PDFInfo
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- JP3566385B2 JP3566385B2 JP7297195A JP7297195A JP3566385B2 JP 3566385 B2 JP3566385 B2 JP 3566385B2 JP 7297195 A JP7297195 A JP 7297195A JP 7297195 A JP7297195 A JP 7297195A JP 3566385 B2 JP3566385 B2 JP 3566385B2
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- hydraulic material
- portland cement
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- 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
- C04B28/04—Portland cements
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は高層建築ＰＣ部材、永久型枠部材等に利用できる曲げ強度の高い硬化体の製造方法及びそれに使用する水硬性材料に関するものである。
【０００２】
【従来の技術】
近年、コンクリート構造物の多様化により高層建築では薄型ＰＣ部材が、土木分野では施工合理化のため永久型枠部材等圧縮強度及び曲げ強度の高いコンクリートの利用分野が拡大されている。
【０００３】
従来から特に曲げ強度の高い硬化体を得るため、セメント、超微粒子及び分散剤を使用して緻密な水和硬化体を形成させる方法が提案されている。これらは１，０００ｋｇｆ／ｃｍ２程度の圧縮強度を発現することは可能となっているが、曲げ強度については１００〜１２０ｋｇｆ／ｃｍ２程度がほぼ上限となっている。
【０００４】
これに対し、最近本発明者らは、硬化体において高圧縮強度及び高曲げ強度を発現させるためには、硬化体の空隙率を減少させればよいとの原理に基づき、密充填された粒径０．５〜１００μｍ のセメント粒子の間の空隙に、粒径０．０１〜０．５μｍ の無機固体粒子と粒径０．１〜１５μｍ の連続粒度分布をもつ吸水性が大きくない粒子を充填させてコンクリート又はモルタルを強化する方法を見出し、特許出願した（特開平２−１０２１５２号公報）。
【０００５】
【発明が解決しようとする課題】
この水硬性材料は物理的な充填性が極めて向上し、高い圧縮強度及び曲げ強度を有する硬化体を得るのに有用であるが、更に曲げ強度の向上した硬化体の出現が望まれている。
従って、本発明の目的は圧縮強度だけでなく曲げ強度についてもより高い硬化体の製造方法及びこれに用いる水硬性材料を提供することにある。
【０００６】
【課題を解決するための手段】
そこで本発明者らは水和硬化体の強度、特に曲げ強度の向上を指標にして更に研究した結果、ポルトランドセメントに一定範囲の比表面積を有する微粉末及びシリカ質微粉末に加えて、特定の比表面積を有する石膏を配合した材料を用いれば、曲げ強度が更に飛躍的に向上した硬化体が得られることを見出し、本発明を完成するに至った。
【０００７】
すなわち、本発明はポルトランドセメント１００重量部、比表面積６，０００〜３０，０００ｃｍ２／ｇの高炉スラグ、白土、珪石及びフライアッシュから選ばれる微粉末１０〜４０重量部及び比表面積１００，０００〜４００，０００ｃｍ２／ｇのシリカ質微粉末２〜２０重量部を含有し、更に比表面積３，０００〜２０，０００ｃｍ２／ｇの石膏をＳＯ３換算で全水硬性材料の２〜５重量部となるように配合したことを特徴とする水硬性材料を提供するものである。
また、本発明は上記水硬性材料に当該水硬性材料１００重量部に対して１５〜３０重量部の水を加えた混練物を養生することを特徴とする硬化体の製造方法を提供するものである。
更にまた、本発明は上記水硬性材料に当該水硬性材料１００重量部に対して水１５〜３０重量部及び骨材５０〜４００重量部を加えた混練物を養生することを特徴とする硬化体の製造方法を提供するものである。
【０００８】
本発明の水硬性材料に用いられるポルトランドセメントは、特に制限されず、例えば普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、耐硫酸塩ポルトランドセメント、白色ポルトランドセメント、低熱ポルトランドセメント、高ビーライト型高流動セメント等が挙げられるが、このうち普通ポルトランドセメント、早強ポルトランドセメント、中庸熱ポルトランドセメント、高ビーライト型高流動セメントが特に好ましい。また、これらのポルトランドセメントは単独でも２種以上を混合して用いてもよい。
これらのポルトランドセメントの比表面積は特に制限されないが、例えば２，５００〜５，８００ｃｍ２／ｇが好ましい。
【０００９】
本発明に用いられる高炉スラグ、白土、珪石及びフライアッシュから選ばれる微粉末は、ポルトランドセメント粒子の空隙をうめる目的で配合されるものであり、このうち特に曲げ強度の増進には活性度の高い高炉スラグが好ましい。また、これらの微粉末の比表面積は、上記配合目的より６，０００〜３０，０００ｃｍ２／ｇであるが、特に８，０００〜１５，０００ｃｍ２／ｇが好ましい。また、これらの微粉末のポルトランドセメント１００重量部に対する添加量は１０〜４０重量部、好ましくは２０〜３０重量部であり、１０重量部未満であると微粉末の充填効果がみられない事と経済的なメリットが得られず、４０重量部を超えると逆に強度が低下する。
【００１０】
本発明に用いられるシリカ質微粉末は、ポルトランドセメントと上記微粉末との充填でも更に残存する空隙をうめるものであり、これらシリカ質微粉末としては例えばシリコンや含シリコン合金及びジルコニア等を製造する際の副生物であるシリカフュームやシリカ質ダストが特に好適に用いられるが、それ以外のものであっても比表面積を満足すれば用いることができる。これらのシリカ質微粉末の比表面積は、上記配合目的から１００，０００〜４００，０００ｃｍ２／ｇであるが、１５０，０００〜３００，０００ｃｍ２／ｇが特に好ましい。これらのシリカ質微粉末のポルトランドセメント１００重量部に対する添加量は２〜２０重量部、好ましくは８〜１５重量部である。２重量部未満であるとシリカ質微粉末の充填効果がみられず、２０重量部を超えると分散のために添加する高性能減水剤の添加量を著しく多くする必要がある。
【００１１】
本発明に用いられる石膏はポルトランドセメント、微粉末及びシリカ質微粉末の充填でも更に残存する空隙を水との反応により生成するカルシウムサルフォアルミネート水和物によってうめるものであり、この石膏の配合により水和硬化体の曲げ強度が大幅に向上する。かかる石膏としては、二水石膏、半水石膏及び無水石膏が挙げられ、これらを組み合せて用いるのが好ましい。石膏の比表面積は３，０００〜２０，０００ｃｍ２／ｇであるが、５，０００〜１５，０００ｃｍ２／
ｇが特に好ましい。また石膏の配合量はＳＯ３換算で全水硬性材料の２〜５重量部となる量である。ところでポルトランドセメントにはＳＯ３が含まれているので、ポルトランドセメントとして普通ポルトランドセメント、中庸熱ポルトランドセメント、耐硫酸塩ポルトランドセメント又は低熱ポルトランドセメントを使用した場合の石膏の配合量はＳＯ３換算で２〜５重量部となる量が好ましく、一方早強ポルトランドセメント、超早強ポルトランドセメント、白色ポルトランドセメント、高ビーライト型高流動セメントを用いた場合の石膏の配合量はＳＯ３換算で３〜５重量部となる量が好ましい。
【００１２】
更に、本発明の水硬性材料には、上記水硬性材料１００重量部に対して０．５〜５重量部の高性能減水剤を配合するのが、水硬性材料の分散による充填性や流動性を向上させるうえで好ましい。高性能減水剤の種類は目的にあったものであればいずれのものを用いてもよい。例えばメラミンスルホン酸ホルムアルデヒド縮合物の塩やアルキルナフタレンスルホン酸ホルムアルデヒド縮合の塩、あるいは高分子量リグニンスルホン酸塩及びポリカルボン酸塩等を主成分としたものなどを例として挙げることができる。
【００１３】
本発明においては前記した各種の粉体成分に対して更に適量の繊維を併用することができる。また、適量の石灰石粉を添加してもよい。
【００１４】
本発明の水硬性材料を用いて硬化体を製造するには、上記の水硬性材料１００重量部に対して１５〜３０重量部の水を加えて混練した後、当該混練物を養生することにより実施される。
【００１５】
また、本発明の硬化体においては、砂又は砂利等の骨材を加えることができる。この骨材としては強度面からモース硬度６以上の基準で選定される硬質骨材を使用することが好ましい。また骨材の配合量は上記水硬性材料１００重量部に対して５０〜４００重量部が好ましい。
【００１６】
養生方法としては、水中養生、常圧蒸気養生、オートクレーブ養生のいずれでもよいが、特に常圧蒸気養生が好ましい。常圧蒸気養生の条件としては１０〜３０℃で２〜６時間前置きした後６０〜８０℃で２〜２４時間蒸気養生するのが好ましい。
【００１７】
【実施例】
次に実施例を挙げて本発明を詳細に説明するが、本発明はこれら実施例に何ら限定されるものではない。
【００１８】
実施例１〜５並びに比較例１及び２
表１記載の組成の水硬性材料を用いて硬化体を製造し、その曲げ強度及び圧縮強度を測定した。
硬化体の製造は、水硬性材料に表１に記載した量の水及び水硬性材料と同重量の粗粒率２．８０の川砂を混練した後、前置き２時間２０℃、最高温度６５℃３時間保持の常圧蒸気養生することにより行った。
材料として、普通ポルトランドセメント（秩父小野田社製、ブレーン比表面積３３４０ｃｍ２／ｇ）、高炉スラグ微粉末〔ファインセラメント１０Ａ（第一セメント社製）の粉砕調整品（ブレーン比表面積１０，３１０ｃｍ２／ｇ）〕、白土微粉末〔寄居白土の粉砕調整品（ブレーン比表面積１０，２９０ｃｍ２／ｇ）〕、珪石微粉末〔マッハ１００（敦賀セメント社製、ブレーン比表面積１０，５９０ｃｍ２／ｇ）〕、シリカ質微粉末〔マイクロシリカ９４０Ｕ（エルケムジャパン社より入手、ブレーン比表面積２４４，５００ｃｍ２／ｇ）〕、石膏〔二水石膏（新日鐡化学社より入手、ブレーン比表面積６，２１０ｃｍ２／ｇ）〕を用いた。なお、高性能減水剤としてマイティ１００（花王社製）を用いた。
フロー値が２５０となるように水量を調整したモルタルを常圧蒸気養生した後の曲げ強度と圧縮強度を表１に示す。
なお、曲げ強度及び圧縮強度はＪＩＳ Ｒ５２０１に従って測定した。
【００１９】
【表１】
表１から明らかなように、本発明の実施例は、比較例に比べ圧縮強度だけでなく曲げ強度の増加が大きいことがわかる。
【００２１】
【発明の効果】
本発明の水硬性材料を用いて製造した硬化体は、圧縮強度だけでなく曲げ強度が著しく向上し、高層建築ＰＣ部材、永久型枠部材等として有用である。[0001]
[Industrial applications]
The present invention relates to a method for producing a cured product having high bending strength which can be used for high-rise building PC members, permanent form members, and the like, and a hydraulic material used therefor.
[0002]
[Prior art]
In recent years, the use of thin PC members in high-rise buildings due to the diversification of concrete structures, and concrete fields with high compressive strength and bending strength, such as permanent form members, have been expanded in the civil engineering field to streamline construction.
[0003]
Conventionally, in order to obtain a cured product having particularly high bending strength, a method of forming a dense hydrated cured product using cement, ultrafine particles, and a dispersant has been proposed. These While it has become possible to express the compressive strength of about 1,000 kgf / cm 2, for flexural strength is almost the upper limit of about 100~120kgf / cm 2.
[0004]
On the other hand, recently, the present inventors have proposed that a densely packed granule is developed based on the principle that the porosity of a cured body should be reduced in order to develop high compression strength and high bending strength in the cured body. Filling voids between cement particles having a diameter of 0.5 to 100 μm with inorganic solid particles having a particle diameter of 0.01 to 0.5 μm and particles having a low water absorption having a continuous particle size distribution of 0.1 to 15 μm. A method of strengthening concrete or mortar by finding the method was found, and a patent application was filed (Japanese Patent Application Laid-Open No. 2-102152).
[0005]
[Problems to be solved by the invention]
This hydraulic material has extremely improved physical filling properties and is useful for obtaining a cured product having high compressive strength and bending strength. However, the appearance of a cured product further improved in bending strength is desired.
Accordingly, an object of the present invention is to provide a method for producing a cured product having not only a high compressive strength but also a high flexural strength, and a hydraulic material used for the same.
[0006]
[Means for Solving the Problems]
Therefore, the present inventors have further studied the strength of the hydrated cured product, particularly the improvement of the bending strength as an index.In addition to the fine powder having a specific surface area in a certain range and the fine silica powder in Portland cement, It has been found that the use of a material in which gypsum having a specific surface area is blended results in a cured product having a significantly improved flexural strength, and the present invention has been completed.
[0007]
That is, the present invention provides 100 parts by weight of Portland cement, 10 to 40 parts by weight of a fine powder selected from blast furnace slag having a specific surface area of 6,000 to 30,000 cm 2 / g, clay, silica stone and fly ash, and a specific surface area of 100,000 to It contains 2 to 20 parts by weight of a siliceous fine powder of 400,000 cm 2 / g and gypsum of a specific surface area of 3,000 to 20,000 cm 2 / g in an amount of 2 to 5 parts by weight of the total hydraulic material in terms of SO 3. It is intended to provide a hydraulic material characterized by being blended so as to be as follows.
The present invention also provides a method for producing a cured product, which comprises curing a kneaded product obtained by adding 15 to 30 parts by weight of water to 100 parts by weight of the hydraulic material to the hydraulic material. is there.
Furthermore, the present invention cures a kneaded product obtained by adding 15 to 30 parts by weight of water and 50 to 400 parts by weight of aggregate to 100 parts by weight of the hydraulic material to the hydraulic material. Is provided.
[0008]
Portland cement used for the hydraulic material of the present invention is not particularly limited, and includes, for example, ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, moderately heated Portland cement, sulfate-resistant Portland cement, white Portland cement, and low heat. Portland cement, high-belite type high-flow cement, and the like can be mentioned. Among them, ordinary portland cement, early-strength portland cement, moderately heated portland cement, and high-belite type high-flow cement are particularly preferable. These Portland cements may be used alone or in combination of two or more.
The specific surface area of these Portland cements is not particularly limited, but is preferably, for example, 2,500 to 5,800 cm 2 / g.
[0009]
Blast furnace slag used in the present invention, fine powder selected from clay, silica stone and fly ash is blended for the purpose of filling the voids of Portland cement particles, and among them, high activity is particularly high for increasing the bending strength. Blast furnace slag is preferred. The specific surface area of these fine powders is the 6,000~30,000cm 2 / g from the above formulation purposes, particularly 8,000~15,000cm 2 / g are preferred. Further, the addition amount of these fine powders to 100 parts by weight of Portland cement is 10 to 40 parts by weight, preferably 20 to 30 parts by weight, and if less than 10 parts by weight, the effect of filling the fine powders is not observed. No economic merit can be obtained, and if it exceeds 40 parts by weight, the strength decreases conversely.
[0010]
The siliceous fine powder used in the present invention fills the remaining voids even when the portland cement and the fine powder are filled. Examples of these siliceous fine powders include silicon, silicon-containing alloys, and zirconia. Silica fume and siliceous dust, which are by-products at this time, are particularly preferably used, but other substances can be used as long as they satisfy the specific surface area. The specific surface area of the end these siliceous fines is a 100,000~400,000cm 2 / g from the above formulation purposes, 150,000~300,000cm 2 / g is particularly preferred. The addition amount of these siliceous fine powders to 100 parts by weight of Portland cement is 2 to 20 parts by weight, preferably 8 to 15 parts by weight. If the amount is less than 2 parts by weight, the effect of filling the siliceous fine powder is not seen, and if it exceeds 20 parts by weight, it is necessary to significantly increase the amount of the high-performance water reducing agent added for dispersion.
[0011]
The gypsum used in the present invention is one in which the remaining voids are filled with calcium sulfoaluminate hydrate formed by reaction with water even when the portland cement, fine powder and siliceous fine powder are filled. As a result, the bending strength of the hydrated cured product is greatly improved. Examples of such gypsum include gypsum dihydrate, gypsum hemihydrate and gypsum anhydrous, and it is preferable to use them in combination. Although the specific surface area of the gypsum is 3,000~20,000cm 2 / g, 5,000~15,000cm 2 /
g is particularly preferred. The amount of plaster is 2 to 5 parts by weight of the total hydraulic material in terms of SO 3 . However since the Portland cement contains SO 3, ordinary Portland cement as a Portland cement, moderate heat Portland cement, the amount of gypsum in the case of using the sulfate resistant Portland cement or low heat Portland cement converted to SO 3 2 The amount is preferably 5 to 5 parts by weight. On the other hand, the amount of gypsum when using early-strength Portland cement, ultra-high-strength Portland cement, white Portland cement, or high belite type high-flow cement is 3 to 5 in terms of SO 3. Amounts by weight are preferred.
[0012]
Furthermore, the hydraulic material of the present invention is blended with 0.5 to 5 parts by weight of a high-performance water reducing agent based on 100 parts by weight of the hydraulic material. It is preferable in improving the value. Any type of high-performance water reducing agent may be used as long as it meets the purpose. Examples thereof include salts of melamine sulfonic acid formaldehyde condensate, salts of alkylnaphthalene sulfonic acid formaldehyde condensation, and those mainly containing high molecular weight lignin sulfonate and polycarboxylate.
[0013]
In the present invention, an appropriate amount of fiber can be used in combination with the various powder components described above. Also, an appropriate amount of limestone powder may be added.
[0014]
In order to produce a cured product using the hydraulic material of the present invention, 15 to 30 parts by weight of water is added to and kneaded with 100 parts by weight of the above-described hydraulic material, and the mixture is cured. Will be implemented.
[0015]
In the cured product of the present invention, an aggregate such as sand or gravel can be added. As the aggregate, it is preferable to use a hard aggregate selected based on a Mohs' hardness of 6 or more from the viewpoint of strength. The amount of the aggregate is preferably 50 to 400 parts by weight based on 100 parts by weight of the hydraulic material.
[0016]
As the curing method, any of underwater curing, normal pressure steam curing, and autoclave curing may be used, but normal pressure steam curing is particularly preferable. As the conditions of the normal pressure steam curing, it is preferable to pre-treat at 10 to 30 ° C for 2 to 6 hours and then steam cure at 60 to 80 ° C for 2 to 24 hours.
[0017]
【Example】
Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
[0018]
Examples 1 to 5 and Comparative Examples 1 and 2
A cured product was produced using a hydraulic material having the composition shown in Table 1, and its bending strength and compression strength were measured.
The hardened material was produced by kneading the hydraulic material with water in the amount shown in Table 1 and river sand having the same weight as the hydraulic material and having a coarse particle ratio of 2.80, followed by 2 hours at 20 ° C. and a maximum temperature of 65 ° C. It carried out by carrying out normal-pressure steam curing of time keeping.
As the material, ordinary portland cement (Chichibu Onoda Cement Co., Blaine specific surface area of 3340cm 2 / g), ground granulated blast furnace slag [Fine canceler instrument 10A (manufactured by Daiichi Cement Co.) grinding adjusted improving (Blaine specific surface area of 10,310cm 2 / g)], fine clay powder [pulverized and adjusted product of Yorii clay] (blaine specific surface area: 10,290 cm 2 / g), fine silica powder [Mach 100 (manufactured by Tsuruga Cement Co., brane specific surface area: 10,590 cm 2 / g)] , siliceous fine powder [microsilica 940U (available from Erukemu Japan Co., Blaine specific surface area of 244,500cm 2 / g)], gypsum [gypsum (available from Nippon鐡化Gakusha, Blaine specific surface area of 6,210cm 2 / g)] was used. Mighty 100 (manufactured by Kao Corporation) was used as a high-performance water reducing agent.
Table 1 shows the flexural strength and compressive strength of the mortar whose water amount was adjusted so that the flow value became 250 after steam curing under normal pressure.
The flexural strength and compressive strength were measured according to JIS R5201.
[0019]
[Table 1]
As is evident from Table 1, the examples of the present invention have a greater increase in not only the compressive strength but also the bending strength as compared with the comparative example.
[0021]
【The invention's effect】
The cured product produced by using the hydraulic material of the present invention significantly improves not only the compressive strength but also the bending strength, and is useful as a high-rise building PC member, a permanent form member or the like.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7297195A JP3566385B2 (en) | 1995-03-30 | 1995-03-30 | Method for producing hydraulic material and cured body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7297195A JP3566385B2 (en) | 1995-03-30 | 1995-03-30 | Method for producing hydraulic material and cured body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08268736A JPH08268736A (en) | 1996-10-15 |
| JP3566385B2 true JP3566385B2 (en) | 2004-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7297195A Expired - Fee Related JP3566385B2 (en) | 1995-03-30 | 1995-03-30 | Method for producing hydraulic material and cured body |
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| Country | Link |
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| JP (1) | JP3566385B2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007022913A (en) * | 1997-07-24 | 2007-02-01 | Tokuyama Corp | Highly fluid hydraulic composition |
| KR20010069158A (en) * | 2000-01-12 | 2001-07-23 | 성길모 | A cement admixture composite |
| JP4549558B2 (en) * | 2001-03-08 | 2010-09-22 | 太平洋セメント株式会社 | High durability cement composition |
| GB2385326B (en) * | 2002-02-16 | 2004-08-25 | Schlumberger Holdings | Cementing compositions and methods for high temperature wells |
| JP4620555B2 (en) * | 2005-09-14 | 2011-01-26 | 電気化学工業株式会社 | Molded bodies that receive bending moments made of mortar or concrete |
| JP4620554B2 (en) * | 2005-09-14 | 2011-01-26 | 電気化学工業株式会社 | Abrasion resistant concrete product and manufacturing method thereof |
| JP5019912B2 (en) * | 2007-01-24 | 2012-09-05 | 新日本製鐵株式会社 | Sulfate resistant cement |
| JP2012136434A (en) * | 2007-01-24 | 2012-07-19 | Nippon Steel Corp | Sulfate-resisting cement |
| WO2008111621A1 (en) | 2007-03-06 | 2008-09-18 | Nippon Steel Corporation | Sulfate-resistant cement |
| US8440016B2 (en) | 2008-08-25 | 2013-05-14 | Nippon Steel & Sumitomo Metal Corporation | Sulfate resistant ground granulated blast furnace slag, sulfate resistant cement, and method of production of same |
| JP2012254909A (en) * | 2011-06-10 | 2012-12-27 | Taiheiyo Cement Corp | Cement composition |
| JP5627121B2 (en) * | 2011-11-09 | 2014-11-19 | 株式会社フジタ | Cement mortar permanent formwork |
| JP6957094B2 (en) * | 2017-08-18 | 2021-11-02 | 株式会社デイ・シイ | Cement composition |
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1995
- 1995-03-30 JP JP7297195A patent/JP3566385B2/en not_active Expired - Fee Related
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| JPH08268736A (en) | 1996-10-15 |
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