水泥基浆液的流变性能试验研究

Experimental Study on Rheological Properties of Cement Slurry

摘要: 浆液流变性是影响注浆效果重要因素之一。本文采用漏斗粘度计，在测试不同水灰比纯水泥浆粘度系数的基础上，以粘土、粉煤灰、矿渣代替部分水泥制备了水泥–粉煤灰浆液、水泥–粘土浆液和水泥–矿渣浆液等三种水泥基浆液，测试了不同替代量时粘度变化。研究表明，水泥浆的动力粘度系数随着水灰比增加按幂函数规律减小。水泥–粉煤灰浆液的粘度随着水泥替代量的增加而增大，当替代量小于30%时，粘度基本上呈线性增加，当替代量大于30%后，粘度增加变缓；而水泥–矿渣浆液和水泥–粘土浆液的粘度随着水泥替代量的增加而减小，但替代量增加到15%后，浆液粘度系数基本保持不变。

Abstract: Slurry rheological property is one of the important factors affecting the effect of grouting. By using the funnel viscometer, the viscosity change with different substitution was tested on the basis of the test of viscosity coefficient of different water cement ratio of pure cement paste; the tests include cement-fly ash slurry whose part of cement is replaced by fly ash, cement-clay ash slurry whose part of cement is replaced by clay, and cement-slag ash slurry whose part of cement is replaced by slag. The results show that: the dynamic viscosity coefficient of cement pastes decreases with the increase of the water cement ratio according to the power function law. The cement-fly ash grout viscosity increases with the cement replacement volume increased; when the replacement amount is less than 30%, the viscosity of increased linearly, when the replacement amount is more than 30%, the viscosity increases slowly. However, the cement-clay ash grout and the cement-slag ash grout viscosity decrease with the cement replacement volume increased, but the viscosity coefficient nearly unchanged when the replacement amount is more than 15%.