Development of strong thixotropic cement slurry and determination of its basic properties

In order to govern goaf disaster，the refinement local filling method with strong thirotropic slurry is provided. The strong thixotropic slurry can quickly lose its fluidity and appear solid state in the condition of very low velocity or static,and that shows good application prospect and practical value. In order to systematically study the applicability of thixotropic cement slurry for goaf filling,the basic properties of slurry stability,thixotropy,rheology and the strength of stone body of these slurry were measured. The concept of thixotropic coefficient was put forward,the defects of the thixotropic index and thixotropic annular method were remedied when the thixotropic index or thixotropic annular method was used to characterize the engineering slurry that the thixotropy is sensitive to static time. The results show that the ratio of the thixotropic cement slurry is reasonable,the cost is less than 120 RMB/m3,the thixotropy is outstanding,the 15 d uniaxial compressive strength of the stone body under the 1∶5 ash sand ratio is more than 1 MPa,which meets the strength requirement of the filling accumulation body.