| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a grouting cement admixture which enables production of a grouting material having excellent flowability, effectiveness in preventing any bleeding or settlement phenomenon from being caused, good dimensional stability and further, effectiveness in inhibiting heat of hydration from being generated, and also to provide a cement composition containing the admixture. SOLUTION: This admixture comprises: an expansive material which is obtained by subjecting a CaO raw material, an Al203 raw material, an Fe2O3 raw material and a CaSO4 raw material to heat treatment and consists essentially of free lime, calcium aluminoferrite and anhydrous gypsum and has a >=4,000 cm2/g Blaine specific surface area; and a water reducing agent; wherein optionally, the admixture further additionally contains dextrin and/or a gas generating material. This cement composition comprises cement and the grouting cement admixture.</p> |
