| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a mixed cement composition enabling the reduction of the use of cement clinker and excellent in strength development and durability by compounding specific fine powder of blast furnace slag, cement clinker and a mixed cement stimulant. SOLUTION: This mixed cement composition is composed of fine powder of blast furnace slag, which has particle sizes of >=6000cm<2> /g in Blaine value and an average particle diameter of <=5μm, cement clinker and a mixed cement stimulant. Further, it may contain a sulfuric acid salt. As the mixed cement stimulant, e.g. a product, prepared by the heat treatment of a compounded material containing a CaO raw material, an Al2 O3 raw material and a CaSO4 raw material, and consisting of a mineral group containing free lime, hauyne and anhydrous gypsum as active components, is used. The mixed cement composition develops an excellent initial strength and exhibits suppressing effect against carbonation even in the case where >70 pts.wt. of the fine powder of blast furnace slag is compounded in 100 pts.wt. of the composition.</p> |
