High-strength, high-fluidity concrete and its manufacturing method

摘要

PROBLEM TO BE SOLVED: To measure fluidity of high-fluidity concrete conventionally because ready-mixed concrete is used as a test body, and there is a problem that it takes time and effort. In addition, the conventional test method has a problem that the water cement of concrete is high and concrete with a low water cement ratio cannot be evaluated appropriately. SOLUTION: Standard sand specified in JIS R 5201 is blended with high-strength cement, sand cement ratio (S / C) 50 to 70% by mass, water cement ratio (W / C) 12 to 15% by mass, And for mortar in which the amount of high-performance water reducing agent added is 1 to 5% by mass of the above cement, the static flow specified in JIS R 5201 is 260 mm or more and the time required for the static flow to reach 250 mm is 30 to 60. High-strength, high-fluidity concrete is manufactured using high-strength cement in the range of seconds. [Selection diagram] Fig. 1