Roughness effects on the shear bonding properties of interface between magnesium potassium phosphate cement mortar and concrete
Based on the direct shear tests at different normal stress,the roughness effects on shear bonding properties of the interface between magnesium potassium phosphate cement mortar and concrete were evaluated in terms of peak shear strength,residual shear strength,dilatancy deformation,failure patterns and strength parameters.The results indicated that the shear deformation characteristics and shear failure mode were influenced by the roughness and normal stress.When the roughness value was greater than 0,the peak shear strength of the bonding interface shows a quadratic correlation with the roughness value and a positive linear correlation with the normal stress.When the roughness value was above 0 and the normal stress was greater than 1 MPa,the partial shear deformation surface occurred in the interior of the magnesium potassium phosphate cement mortar,which shows the creeping effect in the subsequent shear process with apparent shear expansion.The cohesion of the interface was from 6.5 MPa to 7.5 MPa,and the internal friction angle was from 44.9° to 49.0°.In addition,as the roughness value increases,the cohesion and the internal friction angle both tend to increase and then decrease.The research results can provide the theoretical basis and technical support for the rapid repair of damaged concrete.
roughnessmagnesium potassium phosphate cement mortarshear strengthshear deformationdirect shear test
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