JP4298838B2 - Low shrinkage cement composition - Google Patents
Low shrinkage cement composition Download PDFInfo
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- JP4298838B2 JP4298838B2 JP8733899A JP8733899A JP4298838B2 JP 4298838 B2 JP4298838 B2 JP 4298838B2 JP 8733899 A JP8733899 A JP 8733899A JP 8733899 A JP8733899 A JP 8733899A JP 4298838 B2 JP4298838 B2 JP 4298838B2
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- salt
- composition
- tartaric acid
- calcium sulfoaluminate
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic 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、カルシウムサルホアルミネート組成物を含有するコンクリートの収縮ひずみの低減を図ることのできる低収縮性セメント組成物並びに低収縮性セメント組成物及びこれを含むモルタル又はコンクリートの製造方法に関する。
【０００２】
【従来の技術】
近年、高速道路の橋梁床版補強（増厚）工事が普及しているが、この工事において旧コンクリート床版上に５〜10ｃｍの薄層コンクリートを打ち継ぐ際、薄層コンクリート中の水分が旧コンクリートに奪われ、又は薄層コンクリート表面の水分が日光の直射や風等により蒸発し、又は車両通過による振動が硬化途中のコンクリートに伝わる等により、ひび割れが発生する場合が多い。特に、コンクリートの収縮によるひび割れ発生の危険性が増加し、大きな拘束力によりひび割れが発生し易い状況にある。
【０００３】
一般に、コンクリートの変形性能は、１ｍ当たり２００〜５００μと小さく、また引張強度も圧縮強度の１／９〜１／１３と小さい。したがって、これらを超える応力が作用した場合、コンクリートにひび割れが発生する。かかるひび割れは美観を損なうだけでなく、構造物の耐久性，鋼材の腐食，水密性等の低下を招くことになる。また、最近の高速道路の橋梁床版補強（増厚）工事は１スパンの長さが長く、連続してコンクリートの施工を可能にしうる技術が必要とされている。このため、当該工事において、従来よりも作業可能な時間（可使時間）を更に延長でき、スランプロスを小さくすることが必要となってきた。
【０００４】
かかる高速道路の橋梁床版補強（増厚）工事では、工期の短縮が要求されるため、速硬性のあるカルシウムサルホアルミネートを含有する組成物が多く用いられるが、該組成物を用いて製造したコンクリートは収縮ひずみが比較的大きく、ひび割れの発生が懸念されること、また、従来の凝結遅延剤では可使時間の延長に限界があり、添加量が多くなると強度低下を招き、更にコスト高になる等の問題があった。
【０００５】
【発明が解決しようとする課題】
従って、本発明は、カルシウムサルホアルミネート組成物を含有するコンクリートのひび割れ発生を低減できると共に、可使時間の調節が可能で、強度発現性に優れた低収縮性セメント組成物とその製造方法を提供する。
【０００６】
【発明が解決しようとする課題】
本発明は、上記の課題を解決するために、（１）カルシウムサルホアルミネート（３ＣａＯ・３Ａｌ2Ｏ3・ＣａＳＯ4）を２３〜６０重量％含むカルシウムサルホアルミネート組成物１００重量部に対して、酒石酸（塩）を酒石酸換算で０．１〜１．０重量部含有する低収縮性セメント組成物（クエン酸、ヘプトン酸を含有するものを除く）であって、カルシウムサルホアルミネート組成物と酒石酸（塩）を同時に粉砕するか、若しくは、カルシウムサルホアルミネート組成物を粉砕後に酒石酸（塩）を添加混合するか、又は、カルシウムサルホアルミネート組成物を含むモルタル又はコンクリートを混練する工程において、酒石酸（塩）の粉末又は水溶液を添加することを特徴とする、低収縮性セメント組成物、を提供する。（２）カルシウムサルホアルミネート（３ＣａＯ・３Ａｌ2 Ｏ3 ・ＣａＳＯ4 ）を２３〜６０重量％含むカルシウムサルホアルミネート組成物１００重量部に対して、ホウ酸（塩）をホウ酸換算で０．１５〜０．５重量部及び酒石酸（塩）を酒石酸換算で０．１〜１．０重量部含有する低収縮性セメント組成物であって、カルシウムサルホアルミネート組成物とホウ酸（塩）及び酒石酸（塩）を同時に粉砕するか、若しくは、カルシウムサルホアルミネート組成物を粉砕後にホウ酸（塩）及び酒石酸（塩）を添加混合するか、又は、カルシウムサルホアルミネート組成物を含むモルタル又はコンクリートを混練する工程において、ホウ酸（塩）及び酒石酸（塩）の粉末又は水溶液を添加することを特徴とする、低収縮性セメント組成物を提供する。さらに、（３）前記低収縮性セメント組成物を含むモルタル又はコンクリートを提供するものである。
【０００７】
【発明の実施の形態】
本発明で用いるカルシウムサルホアルミネート組成物は、速硬性成分であるカルシウムサルホアルミネートを２３〜６０重量％含み、その他の成分として、エーライト（3ＣａＯ・ＳｉＯ2）、ビーライト（2ＣａＯ・ＳｉＯ2）、カルシウムアルミネ−トフェライト（4ＣａＯ・Ａｌ2Ｏ3・Ｆｅ2Ｏ3）、カルシウムアルミネート（3ＣａＯ・Ａｌ2Ｏ3）等のクリンカ鉱物や石膏、石灰石、スラグ、フライアッシュ、珪石粉末等の混和材の１種又は２種以上を含む組成物である。カルシウムサルホアルミネートの含有量が２３重量％以上では速硬性が十分であり、６０重量％を超えると十分な可使時間が確保できない。
【０００８】
また、本発明に係る低収縮性セメント組成物は、カルシウムサルホアルミネート（３ＣａＯ・３Ａｌ2Ｏ3・ＣａＳＯ4）を２３〜６０重量％含むカルシウムサルホアルミネート組成物１００重量部に対して、酒石酸（塩）を酒石酸換算で０．１〜１．０重量部含有する低収縮性セメント組成物（クエン酸、ヘプトン酸を含有するものを除く）である。又、カルシウムサルホアルミネート（３ＣａＯ・３Ａｌ2Ｏ3・ＣａＳＯ4）を２３〜６０重量％含むカルシウムサルホアルミネート組成物１００重量部に対して、ホウ酸（塩）をホウ酸換算で０．１５〜０．５重量部及び酒石酸（塩）を酒石酸換算で０．１〜１．０重量部含有する低収縮性セメント組成物である。前記カルシウムサルホアルミネート組成物１００重量部に対し、ホウ酸（塩）の添加量がホウ酸換算で０．１５重量部未満又は酒石酸（塩）の添加量が酒石酸換算で０．１重量部未満では、収縮ひずみ低減効果が小さい。一方、カルシウムサルホアルミネート組成物１００重量部に対し、ホウ酸（塩）及び酒石酸（塩）の添加量がホウ酸及び酒石酸換算で合計で１．５重量部を超えると、初期の強度発現性が損なわれる傾向にある。
【０００９】
尚、酒石酸（塩）又はホウ酸（塩）の単独使用で十分な収縮ひずみ低減効果が得られるが、両者の併用は、相乗効果を発揮して特に有効であるため、より好ましい。
【００１０】
また、低収縮性セメント組成物は、カルシウムサルホアルミネート組成物とホウ酸（塩）及び／又は酒石酸（塩）を同時に粉砕するか、若しくは、カルシウムサルホアルミネート組成物を粉砕後にホウ酸（塩）及び／又は酒石酸（塩）を添加混合して製造する。特に、ホウ酸（塩）及び／又は酒石酸（塩）は、カルシウムサルホアルミネート組成物に添加して同時に粉砕すると、ホウ酸（塩）や酒石酸（塩）は被粉砕性が良好であり微粉末となるため、収縮ひずみの低減や可使時間の延長の効果が一段と向上するのでより好ましい。また、カルシウムサルホアルミネート組成物を含むモルタル又はコンクリートを混練する工程において、ホウ酸（塩）及び／又は酒石酸（塩）の粉末又は水溶液を添加して、低収縮性のモルタル又はコンクリートを製造できる。
【００１１】
【実施例】
以下に本発明の実施例を示すが、これらは例示であり本発明を限定するものではない。
【００１２】
（セメント組成物の調整）
カルシウムサルホアルミネートを２３重量％、エーライト（3ＣａＯ・ＳｉＯ2）を２９重量％、ビーライト（2ＣａＯ・ＳｉＯ2）を１９重量％、カルシウムアルミネ−トフェライト（4ＣａＯ・Ａｌ2Ｏ3・Ｆｅ2Ｏ3）を６重量％、カルシウムアルミネート（3ＣａＯ・Ａｌ2Ｏ3）を５重量％、無水石膏を１８重量％含有するカルシウムサルホアルミネート組成物を用いて、表１に示す配合のセメント組成物を調整した。尚、表１中の数値はカルシウムサルホアルミネート組成物１００重量部に対するホウ酸又は酒石酸の重量部を示す。
【００１３】
（使用薬品）
ホウ酸；工業薬品（ＵＳ ＢＯＲＡＸ社製）
酒石酸；１級試薬（和光純薬社製）
クエン酸；工業薬品（和光純薬社製）
ヘプトン酸ナトリウム；工業薬品（クローダジャパン社製）
【００１４】
【表１】
（試験例）
表１に示すセメント組成物をセメントとして使用し表２に示す配合のコンクリートを用いて、日本コンクリート工学協会（ＪＣＩ）の「高流動コンクリート自己収縮試験方法（仮称）」に従い収縮ひずみを測定した。また、コンクリートの練り混ぜ直後からスランプが３ｃｍ以下になるまでの時間を可使時間として測定した。更に、JIS A 1132「コンクリートの強度試験用供試体の作り方」及びJIS A 1108「コンクリートの圧縮強度試験方法」に従い、材齢３時間後の圧縮強度を測定した。以上の試験は、全て環境温度２０℃の下で行った。
尚、実用上必要なコンクリートの性能は、収縮ひずみで０〜−５００μまで、可使時間で２５分以上、材齢３時間後の圧縮強度で２４Ｎ／ｍｍ2以上である。
【００１６】
【表２】
【表３】
表３より、ホウ酸をカルシウムサルホアルミネート組成物１００重量部に対して０．１５〜０．５重量部含有するセメント組成物（試験例Ａ〜Ｅ）は、収縮ひずみ、可使時間、圧縮強度共に、実用上の要求性能を満たしている。これに対して、ホウ酸が０．１０重量部と少ないセメント組成物（比較例Ｐ）は収縮ひずみが−５４８μと大きく、また、可使時間が２０分と短い。また、ホウ酸が０．６０重量部と多いセメント組成物（比較例Ｑ）は、圧縮強度が２１．７Ｎ／ｍｍ2と低く実用的でない。
【００１９】
また、酒石酸をカルシウムサルホアルミネート組成物１００重量部に対して０．１０〜１．００重量部含有するセメント組成物（実施例Ｆ〜Ｊ）は、収縮ひずみ、可使時間、圧縮強度共に、実用上の要求性能を満たしている。これに対して、酒石酸が０．０５％と少ないセメント組成物（比較例Ｒ）は収縮ひずみが−５２９μと大きく、また、可使時間が１５分と短い。また、酒石酸が１．３０％と多いセメント組成物（比較例Ｓ）は、圧縮強度が１９．３Ｎ／ｍｍ2以下と低く実用的でない。
【００２０】
更に、ホウ酸と酒石酸をカルシウムサルホアルミネート組成物１００重量部に対して、それぞれ０．１５〜０．５０％及び０．１０〜１．００％含有するセメント組成物（実施例Ｋ〜Ｎ）は、それぞれ単独で使用した場合（試験例A〜E、実施例F〜Ｊ）よりも更に優れた収縮ひずみ低減効果を発揮することが分かる。しかし、ホウ酸と酒石酸の添加量が合計で1.5重量部を超えると（比較例Ｕ）、材齢３時間における圧縮強度は測定不能になり、初期の強度発現性が著しく損なわれる。
【００２１】
【発明の効果】
本発明の低収縮性セメント組成物は、以下の効果を有する。
▲１▼コンクリートの収縮ひずみを低減することができ、ひび割れ防止対策として有効である。
▲２▼可使時間が長く確保できるため、可使時間を長く設定する橋梁床版補強（増厚）工事において、現場トラブル時の待機時間にも十分対応が可能であり、施工不可能なコンクリートの発生が無くなる。
▲３▼ホウ酸（塩）及び酒石酸（塩）を併用すると、収縮ひずみ低減効果が更に高まる。
▲４▼可使時間を一定とした場合は、比較的高価な凝結遅延剤の添加量を減じることができコスト低減が図れる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low-shrinkage cement composition capable of reducing shrinkage strain of concrete containing a calcium sulfoaluminate composition, a low-shrinkage cement composition, and a method for producing mortar or concrete containing the same.
[0002]
[Prior art]
In recent years, bridge deck slab reinforcement (thickening) work on expressways has become widespread. However, when 5-10 cm of thin-layer concrete is handed over the old concrete floor slab in this construction, moisture in the thin-layer concrete is old. Cracks often occur due to the loss of concrete, the moisture on the surface of thin-layer concrete evaporates due to direct sunlight, wind, or the like, or the vibration caused by passing through the vehicle is transmitted to the concrete being cured. In particular, there is an increased risk of cracking due to shrinkage of concrete, and cracking is likely to occur due to a large restraining force.
[0003]
In general, the deformation performance of concrete is as small as 200 to 500 μm per meter, and the tensile strength is also as small as 1/9 to 1/13 of the compressive strength. Therefore, when stress exceeding these acts, a crack will generate | occur | produce in concrete. Such cracks not only detract from aesthetics, but also lead to deterioration of the durability of the structure, corrosion of the steel material, water tightness, and the like. In addition, recent highway highway bridge slab reinforcement (thickening) work has a long span and requires a technology that enables continuous concrete construction. For this reason, in this construction, it has become necessary to further extend the workable time (usable time) than before and to reduce the slump loss.
[0004]
In such highway bridge slab reinforcement (thickening) construction, a shortening of the construction period is required, so a composition containing calcium sulfoaluminate with fast hardening is often used, but it is manufactured using the composition. Since the shrinkage strain of the concrete is relatively large, there is a concern about the occurrence of cracks, and with the conventional setting retarder, there is a limit to the extension of the pot life. There were problems such as becoming.
[0005]
[Problems to be solved by the invention]
Therefore, the present invention provides a low-shrinkage cement composition that can reduce the occurrence of cracks in concrete containing a calcium sulfoaluminate composition, can be adjusted in pot life, and has excellent strength development, and a method for producing the same. provide.
[0006]
[Problems to be solved by the invention]
In order to solve the above problems, the present invention provides (1) tartaric acid (salt) with respect to 100 parts by weight of calcium sulfoaluminate composition containing 23-60% by weight of calcium sulfoaluminate (3CaO.3Al2O3.CaSO4). ) Is a low-shrinkage cement composition (excluding those containing citric acid and heptonic acid) in terms of tartaric acid, the calcium sulfoaluminate composition and tartaric acid (salt) Or tartaric acid (salt) in the step of kneading the mortar or concrete containing the calcium sulfoaluminate composition. A low-shrinkage cement composition characterized by adding a powder or an aqueous solution of (2) to calcium sulfoaluminate (3CaO · 3Al2 O3 · CaSO4) 23 to 60 wt% calcium sulfoaluminate 100 parts by weight of the composition, boric acid (salt) borate terms 0.15 to 0 A low-shrinkage cement composition containing 5 parts by weight and tartaric acid (salt) in an amount of 0.1 to 1.0 parts by weight in terms of tartaric acid , the calcium sulfoaluminate composition, boric acid (salt) and tartaric acid (salt) ) At the same time, or after pulverizing the calcium sulfoaluminate composition, boric acid (salt) and tartaric acid (salt) are added and mixed, or mortar or concrete containing the calcium sulfoaluminate composition is kneaded Provided is a low shrinkage cement composition characterized by adding boric acid (salt) and tartaric acid (salt) powder or aqueous solution in the process The Furthermore, (3) mortar or concrete containing the low shrinkage cement composition is provided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Calcium sulfoaluminate composition used in the present invention, quick comprises 23-60 wt% of calcium sulfoaluminate a hard component, as other components, alite (3CaO · SiO2), belite (2CaO · SiO2), Contains one or more of clinker minerals such as calcium aluminate ferrite (4CaO.Al2O3.Fe2O3), calcium aluminate (3CaO.Al2O3), gypsum, limestone, slag, fly ash and silica powder. It is a composition. If the calcium sulfoaluminate content is 23% by weight or more, the quick setting is sufficient, and if it exceeds 60% by weight , sufficient pot life cannot be secured.
[0008]
The low-shrinkage cement composition according to the present invention contains tartaric acid (salt) with respect to 100 parts by weight of calcium sulfoaluminate composition containing 23-60% by weight of calcium sulfoaluminate (3CaO.3Al2O3.CaSO4). A low shrinkage cement composition (excluding those containing citric acid and heptonic acid) containing 0.1 to 1.0 parts by weight in terms of tartaric acid. Moreover, boric acid (salt) is 0.15-0.5 in terms of boric acid with respect to 100 parts by weight of calcium sulfoaluminate composition containing 23-60% by weight of calcium sulfoaluminate (3CaO.3Al2O3.CaSO4). It is a low shrinkage cement composition containing 0.1 part by weight and 1.0 part by weight of tartaric acid (salt) in terms of tartaric acid. With respect to 100 parts by weight of the calcium sulfoaluminate composition, the amount of boric acid (salt) added is less than 0.15 parts by weight in terms of boric acid or the amount of tartaric acid (salt) added is less than 0.1 parts by weight in terms of tartaric acid. Then, the shrinkage strain reduction effect is small. On the other hand, if the addition amount of boric acid (salt) and tartaric acid (salt) exceeds 1.5 parts by weight in terms of boric acid and tartaric acid, the initial strength development is 100 parts by weight of calcium sulfoaluminate composition. Tend to be damaged.
[0009]
The use of tartaric acid (salt) or boric acid (salt) alone can provide a sufficient effect of reducing shrinkage strain, but the combined use of both is more preferable because it exhibits a synergistic effect and is particularly effective.
[0010]
The low-shrinkage cement composition may be prepared by pulverizing the calcium sulfoaluminate composition and boric acid (salt) and / or tartaric acid (salt) at the same time, or after pulverizing the calcium sulfoaluminate composition. ) And / or tartaric acid (salt). In particular, when boric acid (salt) and / or tartaric acid (salt) are added to a calcium sulfoaluminate composition and pulverized at the same time, boric acid (salt) and tartaric acid (salt) have fine grindability and fine powder. Therefore, the effect of reducing the shrinkage strain and extending the pot life is further improved, which is more preferable. Further, in the step of kneading the mortar or concrete containing the calcium sulfoaluminate composition, boric acid (salt) and / or tartaric acid (salt) powder or an aqueous solution can be added to produce a low shrinkage mortar or concrete. .
[0011]
【Example】
Examples of the present invention will be shown below, but these are exemplifications and do not limit the present invention.
[0012]
(Adjustment of cement composition)
Calcium sulfoaluminate 23% by weight, 29 wt% of alite (3CaO · SiO 2), belite (2CaO · SiO 2) 19 wt% calcium aluminate - DOO ferrite (4CaO · Al 2 O 3 · Fe 2 O 3) 6% by weight of calcium aluminate (3CaO · Al 2 O 3) 5 wt%, using calcium sulfoaluminate composition containing anhydrous gypsum 18 wt%, the cement composition of the formulation shown in Table 1 I adjusted things. In addition, the numerical value of Table 1 shows the weight part of boric acid or tartaric acid with respect to 100 weight part of calcium sulfoaluminate compositions.
[0013]
(Chemicals used)
Boric acid; industrial chemicals (US BORAX)
Tartaric acid: First grade reagent (Wako Pure Chemical Industries, Ltd.)
Citric acid; industrial chemical (manufactured by Wako Pure Chemical Industries, Ltd.)
Sodium heptanoate; industrial chemicals (manufactured by Croda Japan)
[0014]
[Table 1]
(Test example)
Using the cement composition shown in Table 1 as cement and the concrete having the composition shown in Table 2, the shrinkage strain was measured in accordance with “High Fluid Concrete Self-Shrinkage Test Method (tentative name)” of Japan Concrete Institute (JCI). Moreover, the time from immediately after mixing the concrete until the slump became 3 cm or less was measured as the pot life. Furthermore, the compressive strength after 3 hours of age was measured according to JIS A 1132 “How to make a specimen for concrete strength test” and JIS A 1108 “Concrete compressive strength test method”. The above tests were all performed at an environmental temperature of 20 ° C.
The concrete performance necessary for practical use is from 0 to -500 μ in terms of shrinkage strain, 25 minutes or more in pot life, and 24 N / mm 2 or more in compressive strength after 3 hours of age.
[0016]
[Table 2]
[Table 3]
From Table 3, the cement composition ( Test Examples A to E) containing 0.15 to 0.5 parts by weight of boric acid with respect to 100 parts by weight of the calcium sulfoaluminate composition has shrinkage strain, pot life, and compression. Both strengths meet practical performance requirements. On the other hand, a cement composition (Comparative Example P) containing as little as 0.10 parts by weight of boric acid has a large shrinkage strain of -548 μm and a pot life of 20 minutes. Further, a cement composition (Comparative Example Q) having a high boric acid content of 0.60 parts by weight has a low compressive strength of 21.7 N / mm 2 and is not practical.
[0019]
In addition, the cement composition (Examples F to J) containing 0.10 to 1.00 parts by weight of tartaric acid with respect to 100 parts by weight of the calcium sulfoaluminate composition has both shrinkage strain, pot life, and compressive strength. Meet practical performance requirements. On the other hand, the cement composition (Comparative Example R) containing as little as 0.05% tartaric acid has a large shrinkage strain of -529 μm and a short pot life of 15 minutes. In addition, a cement composition (Comparative Example S) containing as much tartaric acid as 1.30% has a compressive strength of 19.3 N / mm 2 or less and is not practical.
[0020]
Further, a cement composition containing 0.15 to 0.50% and 0.10 to 1.00% of boric acid and tartaric acid with respect to 100 parts by weight of the calcium sulfoaluminate composition (Examples K to N), respectively. It can be seen that they exhibit an even better shrinkage strain reducing effect than when used alone ( Test Examples A to E, Examples F to J ). However, if the total amount of boric acid and tartaric acid exceeds 1.5 parts by weight (Comparative Example U), the compressive strength at a material age of 3 hours becomes unmeasurable, and the initial strength development is significantly impaired.
[0021]
【The invention's effect】
The low shrinkage cement composition of the present invention has the following effects.
(1) It can reduce the shrinkage strain of concrete and is effective as a crack prevention measure.
(2) Because the pot life can be secured for a long time, the bridge floor slab reinforcement (thickening) construction that sets the pot life long can sufficiently cope with the waiting time at the time of on-site trouble, and cannot be constructed concrete No longer occurs.
(3) When boric acid (salt) and tartaric acid (salt) are used in combination, the shrinkage strain reducing effect is further enhanced.
(4) If the pot life is constant, the amount of the relatively expensive setting retarder can be reduced, and the cost can be reduced.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
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| JP8733899A JP4298838B2 (en) | 1999-03-30 | 1999-03-30 | Low shrinkage cement composition |
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| JP8733899A JP4298838B2 (en) | 1999-03-30 | 1999-03-30 | Low shrinkage cement composition |
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| JP4298838B2 true JP4298838B2 (en) | 2009-07-22 |
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| KR100399618B1 (en) * | 2000-11-28 | 2003-09-29 | 강연도 | Manufacture Method of Expansive Material for Cement and Concrete Crack |
| WO2007097435A1 (en) * | 2006-02-24 | 2007-08-30 | Taiheiyo Cement Corporation | Hardened concrete structure and concrete composition |
| JP5403496B2 (en) * | 2006-02-28 | 2014-01-29 | 太平洋セメント株式会社 | Hardened concrete and concrete composition |
| JP2008162831A (en) * | 2006-12-27 | 2008-07-17 | Kajima Corp | Hydraulic kneaded material |
| CN101717209B (en) * | 2009-11-13 | 2012-09-19 | 南京工业大学 | Secondary synthesis method of calcium sulfoaluminate mineral in silicate cement clinker |
| JP5606359B2 (en) * | 2011-02-24 | 2014-10-15 | 太平洋セメント株式会社 | Hydraulic composition |
| JP6211331B2 (en) * | 2012-08-22 | 2017-10-11 | 太平洋セメント株式会社 | Hydraulic composition |
| AU2016361765A1 (en) * | 2015-11-30 | 2018-05-10 | Knauf Gips Kg | Additive for gypsum building materials |
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