Long-distance pumping cement admixture, plastic injection material and injection method

摘要

PROBLEM TO BE SOLVED: To provide a cement admixture for long distance pressure feed and an injection method in which curing and precipitation of a cement milk in long distance pipe arrangement are prevented, the cement milk can be made to remain in the pipe arrangement during night (day time in night construction), thereby disposal of material A in the pipe arrangement and a work of cleaning or the like of the pipe arrangement can be largely reduced, and a construction period, manpower or the like can be reduced, and that have inexpensive price.SOLUTION: A cement admixture for long distance pressure feed includes dextrin and a cellulose derivative, a plasticity injection material includes: a material A that is a cement milk; a material B that is a plasticization material; and a material C, wherein the material A includes cement and the cement admixture for long distance pressure, the material B includes liquid glass, and the material C includes an acryl acid ester copolymer emulsion, and an injection method comprises mixing 150-5,000 pts.vol. of the material A, 50 pts.vol. of the material B, and 50 pts.vol. of the material C in the plasticity injection material right before the injection.