| 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/mm<SP>2</SP>compression strength by using coarse particle cement with a Blaine specific surface area of 1,000-2,400 cm<SP>2</SP>/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/mm<SP>2</SP>compression strength and placing it, and further preparing second high strength concrete of≥50 N/mm<SP>2</SP>compression strength by using coarse particle cement with a Blaine specific surface area of 1,000-2,400 cm<SP>2</SP>/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
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