Influence of Water-Cement Ratio and Slag Powder Content on Shear Strength and Damage Characteristics of Cement-Slag Powder Filled Joints
The shear performance of filled joints is the key to control the stability of rock joints.From the perspective of shear strength and economy of filled joints,blast furnace slag powder was used as a filling material instead of part of cement to conduct compression shear tests on cement-slag powder filled joints.Combined with acoustic emission(AE)technology,the influences of water-cement ratio and slag powder content on the shear strength,AE characteristics,and economic cost of cement-slag powder filled joints were studied.The results show that the water-cement ratio and slag powder content have significant impacts on the shear mechanical properties of cement-slag powder filled joints,and the critical values of water-cement ratio and the slag powder content are 0.8 and 20％,respectively.With the increase of water-cement ratio and slag powder content,the AE activity of filled joints initially tends to increase(0.7＜water-cement ratio＜0.8,0＜slag powder content＜20％),and then tends to decrease(0.8＜water-cement ratio＜1.0,20％＜slag powder content＜40％).The AE characteristics of filled joints are consistent with the influences of water-cement ratio and slag powder content on shear mechanical properties.The coefficient of cost reduction corresponding to increased shear strength was defined and the larger the coefficient,the better the proportioning effect.The optimal proportion is the water-cement ratio of 0.8 and the slag powder content of 20％.From an economic perspective,the cost of filled joints is lower than that with high slag powder content and high water-cement ratio.
万方数据
维普
