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A platform for research: civil engineering, architecture and urbanism
CEMENT ADDITIVE AND CEMENT COMPOSITION
PROBLEM TO BE SOLVED: To provide a cement additive and a cement composition which not only improve workability due to improved flowability retention property but also reduce an elution amount of hexavalent chromium and impart high-early-strength property.SOLUTION: (1) The cement additive comprises a mixed pulverized product of calcium sulfite and silica fume which has 9.0 or more of pH, 50 mv or less of oxidation-reduction potential (ORP), and 0.5% or more of MgO content. (2) The cement additive according to (1), further contains gypsum. (3) The cement additive according to (1) or (2), in which the calcium sulfite is a by-product of lime sulfur production, is provided. (4) The cement composition comprises addition of 1 to 25 pts.mass of the cement additive described in (1) to (3) to 100 pts.mass of cement.SELECTED DRAWING: None
【課題】コンクリートの流動性の保持によって施工性が改善するだけでなく、六価クロム溶出量が低減し、早強性を付与する、セメント添加剤及びセメント組成物。【解決手段】（１）ｐＨ９．０以上、酸化還元電位（ＯＲＰ）５０ｍｖ以下、ＭｇＯ含有量が０．５％以上である亜硫酸カルシウムとシリカフュームの混合粉砕物であるセメント添加剤、（２）さらに、石膏を含有してなる（１）のセメント添加剤、（３）亜硫酸カルシウムが石灰硫黄合剤を製造する際の副産物である（１）または（２）のセメント添加剤、（４）セメント１００質量部に対し、（１）〜（３）に記載のセメント添加剤を１〜２５質量部添加してなるセメント組成物。【選択図】なし
CEMENT ADDITIVE AND CEMENT COMPOSITION
PROBLEM TO BE SOLVED: To provide a cement additive and a cement composition which not only improve workability due to improved flowability retention property but also reduce an elution amount of hexavalent chromium and impart high-early-strength property.SOLUTION: (1) The cement additive comprises a mixed pulverized product of calcium sulfite and silica fume which has 9.0 or more of pH, 50 mv or less of oxidation-reduction potential (ORP), and 0.5% or more of MgO content. (2) The cement additive according to (1), further contains gypsum. (3) The cement additive according to (1) or (2), in which the calcium sulfite is a by-product of lime sulfur production, is provided. (4) The cement composition comprises addition of 1 to 25 pts.mass of the cement additive described in (1) to (3) to 100 pts.mass of cement.SELECTED DRAWING: None
【課題】コンクリートの流動性の保持によって施工性が改善するだけでなく、六価クロム溶出量が低減し、早強性を付与する、セメント添加剤及びセメント組成物。【解決手段】（１）ｐＨ９．０以上、酸化還元電位（ＯＲＰ）５０ｍｖ以下、ＭｇＯ含有量が０．５％以上である亜硫酸カルシウムとシリカフュームの混合粉砕物であるセメント添加剤、（２）さらに、石膏を含有してなる（１）のセメント添加剤、（３）亜硫酸カルシウムが石灰硫黄合剤を製造する際の副産物である（１）または（２）のセメント添加剤、（４）セメント１００質量部に対し、（１）〜（３）に記載のセメント添加剤を１〜２５質量部添加してなるセメント組成物。【選択図】なし
CEMENT ADDITIVE AND CEMENT COMPOSITION
セメント添加剤及びセメント組成物
SASAKI TAKASHI (author) / WATANABE MASAAKI (author) / MORIOKA MINORU (author)
2018-08-09
Patent
Electronic Resource
Japanese
IPC:
C04B
Kalk
,
LIME
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