The Influence of Different Admixtures on the Shear Strength of MPC/Concrete
In order to seek the optimal MPC(magnesium phosphate cement)mix proportions for bonding shear strength applicable to different grades of concrete,a double-shear test method was employed,in which involved incor-porating fly ash(5％,10％)and silica fume(0％,5％,10％)into the MPC.The study examined the bonding shear performance of MPC/concrete(C20,C25,C30,C35,C40)and identified the failure modes and shear strengths at the MPC/concrete bonding interface.The results indicated that there were three forms of interface failure for MPC/con-crete bonding:internal failure within the concrete,internal failure within the adhesive,and delamination between the adhesive and concrete.As the grade of concrete increased,the depth of the interface failure layer shifted from deeper layers towards the surface.The bonding shear strength increased with the grade of concrete,reaching up to 2.9 MPa for C40 concrete.The failure patterns were more balanced and exhibited optimal interface bonding performance when the MPC contained 5％fly ash and silica fume across various concrete strength levels.
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维普
