Experimental study on rheological properties of high concentration cementing materials in coal mine goaf filling
ZHU Shibin
WANG Xiaodong
XU Ganggang
WU Boqiang
YUAN Kekuo
Abstract：In order to ensure the smooth transportation of high concentration filling slurry and the effect of accumulation in goaf,this paper makes a preliminary study of the effects of cement and fly ash as cementitious materials and aeolian sand as aggregates on the rheological properties of high concentration filling slurry under a series of samples with different gelling materials ratio.Test results show that,when the concentration and proportion of cemented material and aggregate are constant,the shear stress,viscosity and thixotropy of the slurry decrease with the proportion of fly ash increases.When the concentration and the content of cement and fly ash in the cementitious material are constant,the shear stress,viscosity and thixotropy of the slurry decrease with the proportion of aggregate decreases.When the proportion of cemented material and aggregate and the content of cement and fly ash in the cementitious material are constant,the shear stress,viscosity and thixotropy of the slurry decrease with the concentration of slurry decreases.Good fluidity and good thixotropy of the slurry material is conducive to slurry pumping.That is,the concentration of selected slurry and the proportion of cemented material and aggregate should be relatively small,and fly ash content in slurry should be relatively large.At this point,shear stress and viscosity of the slurry are small.The fluidity of the slurry is better,and thixotropy of the slurry is poor.
Keywords：goaf lack fillinghigh concentration cementing materialsrheological propertiesgoaf treatment
Publication Date：2017-01-01