粘土水泥系列浆材流变性能研究

Rheological Properties of Series Clay-cement Grouting Material

粘土水泥系列浆材性能优越,价格低廉,可广泛应用于库堤防渗、灌浆加固、溶洞充填、垃圾填埋防护等工程中,其流变性能对灌浆施工及防渗加固效果的影响不可忽视。利用Brookfield+R/S流变仪系统研究粘土水泥系列浆材的流变性能,包括流变模型、粘度时变性和触变性,进而根据其各自流变性能分析其适用范围。结果表明:粘土水泥浆材的流变性能与水固比及粘土掺量有关,其初始粘度较普通水泥浆大,扩散范围可控,在大空隙多孔地层使用适宜配比的粘土水泥浆材进行防渗灌浆,可很好地解决跑浆、串浆的问题,提高灌浆效益;粘土水泥膏浆的流变性能主要与固化剂掺量有关,其初始屈服应力及粘度大,具有良好的抗水流冲释性能,可用于地下动水条件下的防渗堵漏;粘土水泥砂膏浆流变性能与固化剂掺量和砂灰比有关,添加砂料后,初始屈服应力及粘度更大,不易流失,可作为溶洞填充材料,节约工程成本,是耗浆量大的地质条件防渗的优选灌浆材料。

The series of clay-cement materials are fine grouting materials with low price. They have been widely used in areas of landfill,curtain grouting,side slope treatment,cavity-filling and engineering for seepage-proof consolidation. Its rheological properties have an inconvenient influence on process and performance of the grouting engineering. The rheological model,viscosity time variation and thixotropy of this series of clay-cement materials are obtained by using Brookfield ＋ R / S Rheometer. According to their rheological properties,the application range is analyzed. The results show that the rheological properties of clay cement slurry are related to the water-solid ratio and the amount of clay. The initial viscosity is larger than ordinary cement slurry. And the diffusion area is controllable. The clay cement slurry grouting material is widely used in the large space of porous formation. It can solve the problem of running slurry and grout leaking well and improve the efficiency of grouting. The rheological of clay cement paste slurry is mainly related to the amount of curing agent. Its initial yield stress and viscosity are large. And it has great resistance to water flow which can be used for blocking leakage and anti-seepage in the condition of underground dynamic water. The rheological of clay cement sand paste slurry is related to the amount of curing agent and sand-cement ratio. The initial yield stress and viscosity are larger and it＇s not easy todrain after adding sand into the slurry. The sand materials can be used as filler material in the cave,which can save the cost of the engineering. It is the preferred material for anti-seepage grouting with much soil in rock and cave.