Study on the Optimization of Admixtures Based on the Impact of Silica Fume on the Water Dispersion Resistance of Grouting Materials
(1. General Supervision Station of Construction Engineering Quality and Safety of Hangzhou, Hangzhou 310000; 2. Zhongtian Construction Group Co., Ltd., Hangzhou 310009)
Abstract：
To explore the impact of silica fume on the water dispersion resistance of synchronous grouting materials in water-bearing strata and optimize the compound admixtures of grouting materials, synchronous grouting materials in 5 groups of different silica fume contents and 6 groups of different amounts of compound admixtures of silica fume/polyacrylamide (PAM)/hydroxyethyl cellulose (HEC) are prepared for the tests of consistency, fluidity and extension, setting time and water dispersion resistance. The results show that the addition of silica fume, HEC and PAM increases the consistency of synchronous grouting materials but reduces the fluidity; PAM can reduce the slurry fluidity to a greater extent and silica fume can decrease the time-dependent loss of slurry fluidity; and silica fume accelerates the setting of synchronous grouting materials and increases the early strength of slurry. The results of pH value, anti-scouring and underwater/in-air strength ratio tests show that the addition of the three types of materials can significantly improve the water dispersion resistance of synchronous grouting materials. When the content of silica fume is 1.0%~2.0%, the PAM content is 0.05% and the HEC content is 0.20%~0.30%, the consistency, fluidity, setting time and water dispersion resistance of synchronous grouting materials can achieve better results.
.Study on the Optimization of Admixtures Based on the Impact of Silica Fume on the Water Dispersion Resistance of Grouting Materials[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(4): 265-272
2022, Vol. 59 