The cement chemical admixture for jet grout construction method and uses that the jet grout construction method

摘要

PURPOSE: To provide the cement admixture for a jet grouting method which prevents setting, improves setting time and improves grouting and packing properties by incorporating an inorg. sulfate and phosphate into the admixture. ;CONSTITUTION: The cement admixture for the jet grouting method is produced by compounding 1 to 50 pts.wt. phosphate, such as NaH₂PO₄, having ≤0.25mm grain size with 100 pts.wt. inorg. sulfate, such as calcium sulfate, and having ≥2000cm²/g grain size in Blaine value. The cement admixture and cement, such as ordinary Portland cement, are then compounded at need to produce the cement compsn. for the jet grouting method. The cement milk obtd. by kneading 100 pts.wt. the cement compsn. and 50 to 300 pts.wt. water at need is grouted into the ground at 50 to 700kgf/cm² and is mixed with sand and soil. The ground is thus hardened by the jet grouting method.;COPYRIGHT: (C)1995,JPO