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

摘要

PROBLEM TO BE SOLVED: To provide an inexpensive cement admixture for long distance pumping and injection method in which curing and precipitation of cement milk are prevented in long distance piping, the cement milk can remain in the piping during night (daytime in night construction), thereby works of disposal of A material in the piping and cleaning of the piping or the like can be largely reduced, and a construction period and manpower or the like can be reduced.SOLUTION: A cement admixture for long distance pumping includes dextrin and a cellulose derivative, and a plasticity injection material includes: A material that is cement milk; and B material and C material that are plasticization materials, wherein the A material includes cement and the cement admixture for long distance pumping, the B material includes aluminum sulfate, and the C material includes an acryl ester copolymer emulsion, and an injection method comprises the step of mixing 150 to 5,000 pts.vol. of the A material, 50 pts.vol. of the B material, and 50 pts.vol. of the C material just before injection in the plasticity injection material.