Cement constituent and its construction method null for jet grout construction method

摘要

PURPOSE: To provide the cement compsn. for a jet grouting method to be used for ground improvement by molding columnar consolidated bodies sized about 0.5 to 5m into the ground and the jet grouting method using such cement compsn. ;CONSTITUTION: This cement compsn. for the jet grouting method is prepd. by incorporating cement, inorg. sulfate and org. acid into the compsn. This jet grouting method consists in grouting cement paste consisting of this cement compsn. under a high pressure into the ground and curing the paste in combination with the soil. As a result, the effects of preventing setting of cement, improving the setting time, improving grouting and packing properties, etc., are obtd. This compsn. has good flowability and, therefore, has such effects that slime finishing is good, the ground does not bulge, the manpower for a slime treatment is lessened, the treatment diameter is large and the stable formation of the slime is assured. Since the strength of the cured matter molded by the compsn. is high, the bearing force of piles is high. The amt. of the cement to be used and the amt. of the cement paste to be grouted are deceased and the installation is speeded up.;COPYRIGHT: (C)1993,JPO&Japio