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黏土水泥膏浆性能优越,可广泛用于土木、水利等工程的防渗堵漏和基础加固,其流变性能对灌浆工程施工及灌浆效果有重要影响。利用Brookfield+R/S流变仪对其流变参数进行测试,研究固化剂掺量、温度及时间等因素对流变性能的影响。结果表明:膏浆的黏度及屈服应力均随时间增大;固化剂掺量为水泥质量的1.0%左右时的膏浆为Herschel-Bulkey流体,并且具有触变性,防渗堵漏效果最佳;温度在5~40℃之间,温度影响膏浆的黏度及屈服应力,但不影响膏浆的流型,温度越高,黏度越大,28℃下的屈服应力最大。室内灌浆模拟试验及抗冲试验,证明其扩散距离可控,抗水冲释性能强,与纯水泥膏浆相比,初始屈服应力及黏度更大,触变性可控,浆体的稳定性更好。黏土水泥膏浆是含水及大孔隙地层、松软地层等复杂地层灌浆防渗堵漏的优选材料。
Clay cement paste is superior in performance and can be widely used in seepage prevention, plugging and foundation reinforcement of civil engineering and water conservancy projects, and its rheological properties have an important influence on grouting construction and grouting effect. The Brookfield + R / S rheometer was used to test the rheological parameters, and the effects of curing agent dosage, temperature and time on the rheological properties were studied. The results showed that the viscosity and yield stress of the paste increased with time. When the amount of the curing agent was about 1.0% of the cement mass, the paste was Herschel-Bulkey fluid and had thixotropic properties. The temperature is between 5 ℃ and 40 ℃. The temperature affects the viscosity and yield stress of the paste, but it does not affect the flow pattern of the paste. The higher the temperature is, the larger the viscosity is and the maximum yield stress is at 28 ℃. The indoor grouting simulation test and the impact test prove that the diffusion distance is controlled and the resistance to water release is strong. Compared with the pure cement paste, the initial yield stress and viscosity are higher, the thixotropy is controllable and the stability of the slurry is more it is good. Clay cement paste is a preferred material for seepage prevention and plugging in complex formation such as aquifer, macropore formation and soft formation.