| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of placing a jointed concrete reduced in cracking and excellent in packing property, adhesion to existing concrete, usage and workability. SOLUTION: This cement admixture contains an expanding material, dry- shrinkage reducing agent, water reducing agent and aq. polymer dispersion. When a jointed concrete is placed, the joint of existing concrete is covered with the aq. polymer dispersion, and the jointed concrete contg. the cement, expanding material, dry-shrinkage reducing agent and water reducing agent and having >=30 cm packing property by the U-shaped packing test method is placed on the lower face and/or the side face of the existing concrete. |
