纳米材料改性水泥浆液凝结与流动特性试验研究

Experimental Study on the Coagulation and Flow Characteristics of Nano Material Modified Cement Slurry

为解决深部地下岩体微裂隙难以注浆的难题,通过物理试验与正交试验相结合的方法,综合研究超细粉煤灰掺量、纳米硅溶胶掺量、减水剂掺量和水灰比4个因素对浆液凝结特性及流动特性的影响规律。试验结果表明:水灰比对于改性水泥浆液性能的影响较大,水灰比的增大会使浆液凝结时间增长,黏度、结石率明显下降。减水剂和超细粉煤灰能够有效提升浆液的流动特性。纳米硅溶胶对于浆液的凝结特性有着显著影响,纳米硅溶胶掺量增多,浆液的凝结时间减少,结石率上升,黏度略微上升。

In order to solve the difficult problem of grouting for microcracks in deep underground rock mass, the change rules of four factors including the ultra-fine fly ash content, nano silica sol content, water reducing agent content and water-cement ratio on the coagulation and flow characteristics of slurry were studied comprehensively through combining physical experiment and orthogonal experiment analysis. The results show that the water-cement ratio has a greater impact on the performance of the modified cement slurry. The increase of the water-cement ratio will lead to the increase of slurry setting time, and significant decrease of the viscosity and stone rate. Water reducing agent and ultra-fine fly ash can effectively improve the flow characteristics of the slurry. Nano silica sol has a significant effect on the coagulation characteristics of the slurry. When the nano silicate sol content increases, the coagulation time of the slurry decreases, the stone rate increases, and the viscosity increases slightly.