| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a high-fluidity concrete capable of being solidly placed in a high-density bar arrangement part and a complicated shape part and eliminating a compacting operation, by using powder of sludge molten slag as fine powder in a high-fluidity concrete having a specific slump and a prescribed slump flow value. SOLUTION: The high-fluidity concrete having a slight drying shrinkage is formed by mixing water with a cement, a fine aggregate, a coarse aggregate, fine powder, a dispersant and a thickening agent. Powder of sludge molten slag is mixed in the concrete as the whole or a part of the fine powder to secure >=24 cm slump and >=50 cm slump flow value. Preferably, the powder of the sludge molten slug is spherical ash. Preferably a high-performance AE water-reducing agent is used as the dispersant and a wellan gum is used as the thickening agent. Preferably 5-60 wt.% of the total of the cement and the fine powder is powder of the sludge molten slug. Consequently, the cracking resistance of the high-fluidity concrete is increased.</p> |
