| 摘要 |
PROBLEM TO BE SOLVED: To provide concrete capable of shortening a working period and reducing cost because of its self-restoration of a crack even if the crack happens to occur. SOLUTION: The concrete 1 is mixed with water 2, powder 3 of cement 3a and an expansive admixture 3b, fine aggregate 4, coarse aggregate 5, a fiber 6, and an admixture 7, etc. At this time, the weight ratio of the water 2 to the powder 3 consisting of the cement 3a and the expansive admixture 3b is≤45% (preferably about 25-40%), the weight of the expansive admixture 3b is 15-120 kg/m<SP>3</SP>(preferably about 30-80 kg/m<SP>3</SP>). Furthermore, a chemical fiber such as a polypropylene fiber of about 0.03-1.0% to the total volume of the concrete 1 is preferably mixed with the concrete 1. COPYRIGHT: (C)2003,JPO |
