| 摘要 |
PROBLEM TO BE SOLVED: To provide PC grout capable of being kneaded/injected with the same plant as that used for the general grout and remarkably reducing the occurrence of residual air in a duct. SOLUTION: In the production of the PC grout obtained by blending a chemical admixture and a thickening admixture with a binder and water, the water-binder ratio is controlled to 30-70%, 0.1-3.0 wt.% The thickening admixture containing a first water soluble low molecular weight compound (A) selected from a cationic surfactants and a second water soluble low molecular weight compound (B) selected from anionic surfactants per unit water is blended in a ratio of 0.1-3.0 wt.% to one unit water amount, and 0.1-2.0 wt.% carboxyl group-containing polyether based water reducing agent to cement is blended as the chemical admixture. COPYRIGHT: (C)2007,JPO&INPIT |
