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通过高温后高强混凝土(HSC)试件的push-off试验,研究了温度和混凝土抗压强度对HSC剪切强度的影响.基于剪切面细观结构的变化,分析了高温后HSC剪切强度变化的机理,研究了高温后HSC骨料断裂率与剪切强度的关系.结果表明:常温下HSC抗压强度为64.7,94.0 MPa时,200℃后HSC剪切强度较常温时分别略有减小和略有增大;超过200℃后,HSC剪切强度随温度的升高而降低;无论经历多高的温度,混凝土的抗压强度越高,则HSC剪切强度越大;HSC试件剪切面上的骨料断裂率随温度的升高而减小,随混凝土抗压强度的增加而增大.最后,建立了高温后HSC的骨料咬合模型.
The influence of temperature and compressive strength of concrete on the shear strength of HSC were studied by push-off test of high temperature high strength concrete (HSC) specimens.According to the change of microstructure of shear surface, the shear strength of HSC The relationship between HSC aggregate breaking rate and shear strength after high temperature was studied.The results showed that the shear strength of HSC at 200 ℃ after HSC compressive strength was 64.7 and 94.0 MPa respectively, Small and slightly increased; shear strength of HSC decreases with the increase of temperature above 200 ℃; the shear strength of HSC increases with the higher compressive strength of concrete regardless of the temperature; The fracture rate of aggregate on the shear surface decreases with the increase of temperature and increases with the increase of compressive strength of concrete.Finally, the aggregate bite model of HSC after high temperature is established.