| 摘要 |
PROBLEM TO BE SOLVED: To obtain a concrete having sufficient water-permeability, strength and durability without using a special device by kneading a specific wt.% amount of fine aggregates, coarse aggregates, a cement, a water-reducing agent and water, in a mixer. SOLUTION: The fine aggregates are added in an amount of <=20 wt.% based on the coarse aggregates. The ratio of water/cement is preferably <=39%. The fine aggregates and the coarse aggregates are especially not limited but preferably hard. For example, crushed stones, crushed sand, land gravel, land sand, river gravel, river sand, and mountain sand are singly or mixedly used. The cement is especially not limited. The water-reducing agent is especially not limited but preferably selected from sodium lignin sulfonate, sodium glutamate, the high condensate of Naβ-naphthalene sulfonate and a polycarboxylic acid. The concrete may further be mixed with a retarder. The mixer is preferably a hand mixer, an inclined body mixer, a biaxial mixer, a pan type mixer or the like.
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