The early dry heat check prevention mannered null compressive strength

摘要

PROBLEM TO BE SOLVED: To effectively reduce crazing due to initial drying of high strength concrete without necessitating complicated ageing and without adding a large amount of admixtures such as a water reducing agent at the construction by using the high strength concrete.;SOLUTION: The method comprises the steps of preparing high strength concrete of ≥50 N/mm² compression strength by using coarse particle cement with a Blaine specific surface area of 1,000-2,400 cm²/g, and placing the high strength concrete to a site where the surface is exposed. Alternatively, the method comprises the steps of preparing first high strength concrete of ≥50 N/mm² compression strength and placing it, and further preparing second high strength concrete of ≥50 N/mm² compression strength by using coarse particle cement with a Blaine specific surface area of 1,000-2,400 cm²/g which is smaller than that of cement constituting the first high strength concrete, and placing the second high strength concrete on the surface of the first high strength concrete.;COPYRIGHT: (C)2006,JPO&NCIPI