| With the development of sustainable development strategies,the secondary use of building materials has become a hot topic of research.Among them,there are many researches on the pressure-retaining performance of steel pipe recycled concrete,but there are few researches on the bond-slip performance of recycled steel pipe concrete.This article is based on the variables of expansive agent and broken brick as variables to study the effect of recycled steel pipe under its effect.Bond slip performance.Through the experimental study of 81 recycled concrete specimens,the relationship between compressive strength and broken brick parameters and expansive agent parameters of recycled concrete,cube compressive strength of recycled concrete,axial compressive strength of recycled concrete,and regeneration were obtained.The elastic modulus of concrete.Through the launch test of 11 different steel pipe recycled concrete specimens,the relationship between the bond stress of the specimen,the broken brick parameters,and the expansion agent parameters was obtained.From the 11 sets of P-S curves,we obtained: a.the relationship between the load required when the initial displacement of the loading and free ends of the core concrete occurs and the parameters of the broken brick and the expansive agent;b.P-S curve model for steel pipe recycled concrete.Through the analysis of the test results: a.The expansion force calculation formula was obtained;b.Regression obtained the bond strength formula of recycled steel concrete after adding broken bricks and expansion agents.Through 11 ANSYS modeling analysis of recycled steel concrete,11 sets of simulated values were obtained.Comparing the simulated values with the experimental actual values,it was found that the simulated results were less than the actual values,which were approximately 15% to 25%.The deviation is within the allowable range,and it can be concluded that the model can serve the bond-slip performance of recycled steel concrete. |
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