Damage Characteristics of Interface Between Polyurethane Mortar and Concrete Under Alternation of Drying-wetting and Salt Freezing
In order to study the durability of concrete repair interfaces under sulfate dry-wet cycles,salt freezing cy-cles,and drying-wetting and salt freezing alternation,the surface morphology,mass loss,shear strength,and shear fail-ure morphology of the composite specimens were tested through relevant experiments.The mass loss rate and shear strength loss rate under alternation and single action superposition were compared.A damage evolution equation based on shear strength was established under alternating cycles.The experimental results show that the damage degree of the ap-parent morphology,mass loss,and shear strength of the specimens under three different cyclic effects is sulfate drying-wetting and salt freezing alternating effect>salt freezing effect>sulfate drying-wetting effect.The shear failure mode of the specimens is the failure of the base concrete.The effect of alternating action on interface durability is greater than the superposition of sulfate drying-wetting and salt freezing.The correlation coefficients R2 of the established damage evolu-tion equations are all above 0.9,which are in good agreement with experimental data,and it has higher accuracy.
salt freezing cyclesulfate drying-wetting cycleinterface durabilitydamage evolution
万方数据
维普
