PURPOSE: To improve the underwater separation resistance, strength and durability by mixing specific powder with water and a solidifying agent and providing the resultant slurry substance with fluidity.
CONSTITUTION: Powder produced in crushing concrete is sieved to provide powder, having ≤2mm maximum particle diameter and containing ≥60wt.% particles having ≤0.1mm particle diameter. Water in an amount of 60-200wt.% and a solidifying material such as normal Portland cement in an amount of ≤30wt.% are then added to the resultant powder and the obtained mixture is kneaded in a mixer to afford a slurry. Bubbles, as necessary, are then mixed in the slurry to reduce the weight thereof or a viscosity improver such as hydroxyethyl methyl cellulose in an amount of 0.5-4kg based on 1m3 product is mixed therein to produce the objective fluid mortar. The slurry, as necessary, is used for an execution method for filling the slurry in cavities of a structure foundation part produced by ground subsidence, using a lightweight banking material, refilling a ditch for installing an embedded pipe or back-filling a retaining wall or an abutment.
YOSHIHARA MASAHIRO
OMODAKA YASUSHI
