Abstract:

The highimpervious grouting material prepared by Portland cement, alkali free additive and highefficient water reducer is used in ground reinforcement of underwater metro tunnel. The performances of Portland cement grout, i. e. setting time, fluidity and impermeability, under different mixing proportions of additives are analyzed by indoor test. The test results show that the fluidity of the grout can reach 230-270 mm; the setting time of the grout is less than 2 h and the impermeable grade is higher than P8 when the watercement ratio reaches 0.65-1.0. Finally, the applicable conditions of grout under 3 proportions are determined by grouting test of prepared grout in mined tunnel of inclined shaft of Wuyuan Bay StationConvention Center Station Section on Line No. 3 of Xiamen metro; the ground reinforcement effect of the highimpervious grouting material is testified by strength and impermeability of the ground reinforced.

Key words: grouting material, impermeability, fluidity, setting time