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Abstract Based on the technical problems of the grouting fluid flowing along the steep crack faces and the poor reinforcement effects in the grouting reinforcement projects for strong unloading，loose and damaged rock mass induced by the strong earthquake，the SJP–1 aging strengthening cement-chemical grout is developed. The effect of the high-molecular compound additive on the formation rate of calcium silicate hydrate is discussed；and a new theory of solvability film of cement-chemical grout is proposed. The experimental results indicate that the pumpability period of the new cement-chemical grout is 30–90 minutes，initial setting time is 90–210 minutes，final setting time is 130–290 minutes，and the long-term strength of SJP–1 cement-chemical grout is about 10%–20% higher than that of the ordinary cement grout. SJP–1 cement-chemical grout can solve the shortcomings of the higher early strength and the lower long-term strength for the quick setting cement grout，and can reduce the construction cost. Finally，the SJP–1 cement-chemical grout is used successfully in the grouting reinforcement projects for damaged rock masses of Jinping I hydropower station and Wenchuan earthquake disaster area.
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Received: 09 October 2010
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2011, Vol. 30 
