| 摘要 |
PROBLEM TO BE SOLVED: To conspicuously improve physical properties of concrete, such as strength, waterproofness, and life, by rapidly mixing powder containing a high water-absorptive resin as a main component from below ready mixed-concrete when the concrete is placed. SOLUTION: Equivalently mixed power containing a high water-absorptive resin, silica fume, and a powder waterproof agent is dispersed on a placement surface where bars are arranged, of a floor, a roof, or the like, and ready mixed-concrete is pumped up to be placed on the powder in a usual manner. At this time, the mixed powder is mixed into the concrete from a lower surface of the same. The high water-absorptive resin mixed thereinto from below absorbs surplus water content from a lower portion of the concrete, and therefore movement of the surplus water content in an attempt to upward escape is not generated, whereby a water channel therefore is not formed. Thus, physical properties such as strength, waterproofness, and life, of the concrete are conspicuously increased while using the same ready mixed-concrete material and the same placing system as conventional ones, and breathing is eliminated, whereby leveling is carried out earlier and workability is enhanced. |
