| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject concrete having high fluidity, capable of excellently holding the high fluidity, good in material separation resistance, enabling dense filling of spaces and high strength at early stage of material age and having high strength. SOLUTION: This concrete is composed of at least cement, coarse aggregate, fine aggregate, steel fiber of <=30mm in length, fly ash, a high performance AE water-reducing agent of polycarboxylic acid-base or naphthalene-base and a thickening agent mainly containing methyl cellulose or a water-soluble polysaccharide. The blending quantity of the fly ash is in the range of 15-20wt.% of the amount of a bonding agent consisting of the cement and the fly ash, and the blending quantity of the high performance AE water-reducing agent is changed in the range of 1.8-2.4wt.% based on the amount of the bonding agent according to a kneading temperature of the concrete. The blending quantity of the thickening agent is changed according to a kneading temperature and the blending quantity of the high performance AE water-reducing agent. The fine aggregate is compounded in an amount of >=62wt.%. |
