| 摘要 |
PROBLEM TO BE SOLVED: To control the fluidity of concrete by incorporating an org. carbonate compd. in a specified ratio per cement into a high-fluidity concrete containing cement, fine aggregates, coarse aggregates, a cement dispersing agent and water and having slump flow value just after kneading of a specified value. SOLUTION: The cement of 300-750 kg/m<3> unit quantity, the fine aggregates of 600-1200 kg/m<3> unit quantity, the coarse aggregates of 600-1100 kg/m<3> unit quantity, the water of 120-185 kg/m<3> unit quantity and 0.1-1.0 pts.wt. cement dispersing agent such as (meth)acrylic acid based water soluble vinyl copolymer per 100 pts.wt. cement are kneaded to prepare the high-fluidity concrete having slump flow value just after kneaded of 40-75 cm. Moreover, 0.01-1.5 pts.wt. org. carbonate compd. such as ethylene carbonate and/or propylene carbonate per 100 pts.wt. cement is incorporated to the concrete to control the fluidity of the concrete or a mortar. |
