Study on Pore Structure and Mechanical Properties of Recycled Concrete Under Early Stress
In order to alleviate the pressure of waste concrete on the ecological environment and reduce the adverse impact of waste concrete on the ecological environment,the recycled concrete was prepared by using the total replacement of coarse aggregate,and the influence of early stress on the later performance was explored.In order to explore the influence of early stress on later performance,the prepared concrete was cured to a fixed age(1d,3d,7d,14d)and then ballasted(20%,40%,60%,80%of the limit load of the fixed age).By meas-uring its compressive strength,splitting strength and micro-pore structure analysis,it was concluded that the compressive strength of the concrete test block was almost unaffected when it was cured to 28d under preloading load at early age(1d,3d).When the loading is less than 60%of the ultimate load,the compressive strength decreases slightly.When the loading exceeds 60%of the ultimate load,irreversible damage is caused to the in-terior of the concrete,which will lead to an accelerated decrease in the compressive strength of the concrete.The splitting strength of the test block after loading is affected,and its strength is lower than that of the test block without compressive load.When the compressive load is constant,the splitting strength decreases with the in-crease of curing time to a certain age.The micro-pore structure analysis confirms the analysis of its mechanical properties.
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