A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
CEMENT MORTAL/CONCRETE COMPOSITION AND PRODUCTION METHOD THEREFOR
PROBLEM TO BE SOLVED: To provide a cement mortal/concrete composition that exhibits sufficient strength under a normal temperature of about 20°C, has excellent hydration activity and shows good quick-hardening performance and at the same time can suppress occurrence of an initial shrinkage crack due to self-shrinkage and a production method therefor.SOLUTION: A cement mortal/concrete composition includes (1) a cement composition which contains 5 to 40 mass% of CA-based mineral and 0.5 to 1.0 mass% of an alkali sulfate compound (in terms of sodium sulfate), has a mass ratio of lithium carbonate content (in terms of lithium)/CA-based mineral phase content of 0.05 to 3 (mass%), a mass ratio of calcium salt content (in terms of calcium hydroxide)/CA-based mineral phase content of 3 to 40 (mass%) and a mass ratio of gypsum content (in terms of anhydrous gypsum)/CA-based mineral phase content of 0.6 to 1.4 and has a crystallite diameter of CA-based mineral phase of 150 to 500 nm and a lattice constant of 11.940 to 11.975Å as measured by X-ray diffraction, (2) a gluconate and (3) tartaric acid or a tartrate, and contains 0.05 to 0.6 mass% in outer percentage of a gluconate (in terms of gluconic acid) and 0.05 to 0.6 mass% in outer percentage of tartaric acid or a tartrate based on the mass of the cement composition.SELECTED DRAWING: None
【課題】 ２０℃程度の常温下において十分な強度を発現し、水和活性が優れて良好な急硬性能を示すとともに、自己収縮による初期収縮ひび割れの発生を抑制することができる、セメントセメントモルタル・コンクリート組成物及びその製造方法を提供する。【解決手段】 セメントモルタル・コンクリート組成物は、（１）Ｃ１２Ａ７系鉱物を５〜４０質量％、硫酸アルカリ化合物（硫酸ナトリウム換算）を０．５〜１．０質量％含み、炭酸リチウム（リチウム換算）／Ｃ１２Ａ７系鉱物相の含有量の質量比が０．０５〜３（質量％）、カルシウム塩（水酸化カルシウム換算）／Ｃ１２Ａ７系鉱物相の含有量の質量比が３〜４０（質量％）、石膏（無水石膏換算）／Ｃ１２Ａ７系鉱物相の含有量の質量比が０．６〜１．４であり、Ｘ線回折で測定したＣ１２Ａ７系鉱物相の結晶子径が１５０〜５００ｎｍで格子定数が１１．９４０〜１１．９７５Åであるセメント組成物、（２）グルコン酸塩及び（３）酒石酸又は酒石酸塩を含み、前記セメント組成物の質量に対して、グルコン酸塩（グルコン酸換算）を外割で０．０５〜０．６質量％及び前記酒石酸又は酒石酸塩（酒石酸換算）を外割で０．０５〜０．６質量％含む、セメントモルタル・コンクリート組成物である。【選択図】 なし
CEMENT MORTAL/CONCRETE COMPOSITION AND PRODUCTION METHOD THEREFOR
PROBLEM TO BE SOLVED: To provide a cement mortal/concrete composition that exhibits sufficient strength under a normal temperature of about 20°C, has excellent hydration activity and shows good quick-hardening performance and at the same time can suppress occurrence of an initial shrinkage crack due to self-shrinkage and a production method therefor.SOLUTION: A cement mortal/concrete composition includes (1) a cement composition which contains 5 to 40 mass% of CA-based mineral and 0.5 to 1.0 mass% of an alkali sulfate compound (in terms of sodium sulfate), has a mass ratio of lithium carbonate content (in terms of lithium)/CA-based mineral phase content of 0.05 to 3 (mass%), a mass ratio of calcium salt content (in terms of calcium hydroxide)/CA-based mineral phase content of 3 to 40 (mass%) and a mass ratio of gypsum content (in terms of anhydrous gypsum)/CA-based mineral phase content of 0.6 to 1.4 and has a crystallite diameter of CA-based mineral phase of 150 to 500 nm and a lattice constant of 11.940 to 11.975Å as measured by X-ray diffraction, (2) a gluconate and (3) tartaric acid or a tartrate, and contains 0.05 to 0.6 mass% in outer percentage of a gluconate (in terms of gluconic acid) and 0.05 to 0.6 mass% in outer percentage of tartaric acid or a tartrate based on the mass of the cement composition.SELECTED DRAWING: None
【課題】 ２０℃程度の常温下において十分な強度を発現し、水和活性が優れて良好な急硬性能を示すとともに、自己収縮による初期収縮ひび割れの発生を抑制することができる、セメントセメントモルタル・コンクリート組成物及びその製造方法を提供する。【解決手段】 セメントモルタル・コンクリート組成物は、（１）Ｃ１２Ａ７系鉱物を５〜４０質量％、硫酸アルカリ化合物（硫酸ナトリウム換算）を０．５〜１．０質量％含み、炭酸リチウム（リチウム換算）／Ｃ１２Ａ７系鉱物相の含有量の質量比が０．０５〜３（質量％）、カルシウム塩（水酸化カルシウム換算）／Ｃ１２Ａ７系鉱物相の含有量の質量比が３〜４０（質量％）、石膏（無水石膏換算）／Ｃ１２Ａ７系鉱物相の含有量の質量比が０．６〜１．４であり、Ｘ線回折で測定したＣ１２Ａ７系鉱物相の結晶子径が１５０〜５００ｎｍで格子定数が１１．９４０〜１１．９７５Åであるセメント組成物、（２）グルコン酸塩及び（３）酒石酸又は酒石酸塩を含み、前記セメント組成物の質量に対して、グルコン酸塩（グルコン酸換算）を外割で０．０５〜０．６質量％及び前記酒石酸又は酒石酸塩（酒石酸換算）を外割で０．０５〜０．６質量％含む、セメントモルタル・コンクリート組成物である。【選択図】 なし
CEMENT MORTAL/CONCRETE COMPOSITION AND PRODUCTION METHOD THEREFOR
セメントモルタル・コンクリート組成物及びその製造方法
KANO KAZUHIRO (author) / KIKO TOMOKO (author) / KAMIKOUCHI TAKASHI (author) / ITO KYOKO (author) / KIKUCHI SADATO (author) / HIRANO YUKI (author) / OZAWA SATOSHI (author)
2018-11-15
Patent
Electronic Resource
Japanese
IPC:
C04B
Kalk
,
LIME
CEMENT MORTAL/CONCRETE COMPOSITION AND PRODUCTION METHOD THEREFOR
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