| abstract |
PROBLEM TO BE SOLVED: To provide an ultrafast cement composition, an ultrafast cement concrete composition, and an ultrafast cement concrete that can obtain an ultrafast cement cement that not only exhibits high bending strength at the initial age but also has high compressive strength. To do. SOLUTION: Cement, calcium aluminate, gypsum, setting modifier, super hard cement composition comprising steel fibers having a tensile strength of 1,000 N / mm 2 or more, the average diameter of the steel fibers is 0.1 to 1.5 mm The super-fast-hardening cement composition having a fiber length of 3 to 40 mm of steel fibers, and a super-fast-hardening cement concrete composition comprising the super-fast-hardening cement composition and an aggregate, A super-fast-hardened cement concrete containing a cement concrete composition and water is used. [Selection figure] None |