Experimental Study on Age Effect and Influence Factors of Slag-cement-bentonite's Shear Modulus

LI Yuchao,YANG Jialin,LAN Jiwu,HUANG Genqing

Abstract

     The shear wave velocity of slag-cement-bentonite  (S-CB) samples by piezoelectric bending element was tested to study the influence of cementitious material content,slag substitution rate and age on shear wave velocity  (Vs) and shear modulus  (G0). The test results showed that, with the increase of age, decrease of slag substitution rate and increase of content of cementitious material, shear wave velocity  (Vs) of S-CB increased. In the tests, Vs of S-CB is significantly lower than that of cemented clay at the same age. This is mainly due to the higher water content of S-CB than cemented clay. It is observed that the development tendency of S-CB is closely related to the slag substitution rate of cementitious material, and it is not obviously correlated with the content of cementitious material. Based on the test results, the prediction formula for shear modulus of cement-bentonite with age was proposed. If the normalized formula of S-CB with one kind of cementitious material content is obtained by test, the shear modulus of S-CB with other composite cementitious materials content and the same slag replacement rate can be speculated.

 

 

Keywords:   slag-cement-bentonite,  shear wave velocity,  shear modulus,  age effect,  bender element


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