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 an admixture composition for cement that exhibits sufficient strength under a low-temperature environment, have excellent hydration activity and show good quick-hardening performance and at the same time can sufficiently ensure predetermined flowability, and can suppress occurrence of an initial shrinkage crack due to self-shrinkage and a production method therefor and to provide a cement composition using the admixture composition for cement and a production method therefor.SOLUTION: A cement mortal/concrete composition includes (1) an admixture composition for cement which includes a quick-hardening additive for cement containing CA-based mineral phase, gypsum, an alkali sulfate compound, a calcium salt and lithium carbonate, contains 36 to 55 mass% of CA-based mineral, 0.3 to 1.7 mass% of an alkali sulfate compound (in terms of sodium sulfate), 0.01 to 1.3 mass% of lithium carbonate (in terms of lithium) and 1 to 14 mass% of a calcium salt (in terms of calcium hydroxide), has a mass ratio of gypsum content (in terms of anhydrous gypsum)/CAmineral phase content of 0.5 to 1.2, and has a crystallite diameter of CAmineral phase of 150 to 500 nm and a lattice constant of 11.940 to 11.975Å as measured by X-ray diffraction, (2) cement, (3) a lithium salt other than lithium carbonate and (4) a carbonate, and contains 0.01 to 0.15 mass% in outer percentage of the lithium salt (in terms of lithium) and 0.05 to 0.6 mass% in outer percentage of the carbonate (in terms of CO) based on the total amount of the admixture composition for the cement and the cement.SELECTED DRAWING: None
【課題】 低温環境下で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同時に所定の流動性を十分に確保することができ、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、セメント用混和組成物及びその製造方法、並びに当該セメント用混和組成物を用いたセメン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、Ｃ１２Ａ７系鉱物相を含有するセメント用急硬性添加材と、石膏と、硫酸アルカリ化合物と、カルシウム塩と炭酸リチウムとを含み、Ｃ１２Ａ７系鉱物を３６〜５５質量％、硫酸アルカリ化合物（硫酸ナトリウム換算）を０．３〜１．７質量％、炭酸リチウム（リチウム換算）を０．０１〜１．３質量％、カルシウム塩（水酸化カルシウム換算）を１〜１４質量％含有し、石膏（無水石膏換算）／Ｃ１２Ａ７系鉱物相の含有量の質量比が０．５〜１．２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であるセメント用混和組成物、（２）セメント、（３）炭酸リチウム以外のリチウム塩及び（４）炭酸塩を含み、前記セメント用混和組成物及びセメントの総質量に対して、外割で前記リチウム塩（リチウム換算）を０．０１〜０．１５質量％、前記炭酸塩（ＣＯ３換算）を０．０５〜０．６質量％含む。【選択図】 なし
CEMENT MORTAL/CONCRETE COMPOSITION AND PRODUCTION METHOD THEREFOR
PROBLEM TO BE SOLVED: To provide an admixture composition for cement that exhibits sufficient strength under a low-temperature environment, have excellent hydration activity and show good quick-hardening performance and at the same time can sufficiently ensure predetermined flowability, and can suppress occurrence of an initial shrinkage crack due to self-shrinkage and a production method therefor and to provide a cement composition using the admixture composition for cement and a production method therefor.SOLUTION: A cement mortal/concrete composition includes (1) an admixture composition for cement which includes a quick-hardening additive for cement containing CA-based mineral phase, gypsum, an alkali sulfate compound, a calcium salt and lithium carbonate, contains 36 to 55 mass% of CA-based mineral, 0.3 to 1.7 mass% of an alkali sulfate compound (in terms of sodium sulfate), 0.01 to 1.3 mass% of lithium carbonate (in terms of lithium) and 1 to 14 mass% of a calcium salt (in terms of calcium hydroxide), has a mass ratio of gypsum content (in terms of anhydrous gypsum)/CAmineral phase content of 0.5 to 1.2, and has a crystallite diameter of CAmineral phase of 150 to 500 nm and a lattice constant of 11.940 to 11.975Å as measured by X-ray diffraction, (2) cement, (3) a lithium salt other than lithium carbonate and (4) a carbonate, and contains 0.01 to 0.15 mass% in outer percentage of the lithium salt (in terms of lithium) and 0.05 to 0.6 mass% in outer percentage of the carbonate (in terms of CO) based on the total amount of the admixture composition for the cement and the cement.SELECTED DRAWING: None
【課題】 低温環境下で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同時に所定の流動性を十分に確保することができ、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、セメント用混和組成物及びその製造方法、並びに当該セメント用混和組成物を用いたセメン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、Ｃ１２Ａ７系鉱物相を含有するセメント用急硬性添加材と、石膏と、硫酸アルカリ化合物と、カルシウム塩と炭酸リチウムとを含み、Ｃ１２Ａ７系鉱物を３６〜５５質量％、硫酸アルカリ化合物（硫酸ナトリウム換算）を０．３〜１．７質量％、炭酸リチウム（リチウム換算）を０．０１〜１．３質量％、カルシウム塩（水酸化カルシウム換算）を１〜１４質量％含有し、石膏（無水石膏換算）／Ｃ１２Ａ７系鉱物相の含有量の質量比が０．５〜１．２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であるセメント用混和組成物、（２）セメント、（３）炭酸リチウム以外のリチウム塩及び（４）炭酸塩を含み、前記セメント用混和組成物及びセメントの総質量に対して、外割で前記リチウム塩（リチウム換算）を０．０１〜０．１５質量％、前記炭酸塩（ＣＯ３換算）を０．０５〜０．６質量％含む。【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
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