Study on the failure of recycled concrete under compression considering size effect mesoscopic simulation
Recycled coarse aggregate substitution rate,coarse aggregate particle size and cross-section size affect the uniaxial compression failure behavior of recycled concrete.In this paper,a two-dimensional mesoscopic model of recycled concrete is established by using mesoscale numerical simulation method.The stress-strain curve,damage expansion and the whole process of failure of recycled concrete under uniaxial compression are simulated and analyzed.The results indicate that under static loading,the damage of recycled concrete expands from inside to outside,initially appearing in the weakest interfacial transition zone and then developing to the mortar matrix.The failure mode and mechanical properties of recycled concrete are affected by the changes of cross-section size,coarse aggregate particle size and recycled coarse aggregate substitution rate.There is a notable size effect in recycled concrete,the increase of particle size and substitution rate of recycled coarse aggregates under various cross-sectional dimensions generally mitigate this size effect.When the substitution rate of recycled coarse aggregate is 100%,the size effect can be effectively suppressed.
万方数据
维普
