Experimental Study on Performance of Recycled Concrete Under Salt-freeze Coupling
In order to study the salt-freezing resistance of recycled concrete,the mechanical properties of recycled concrete after freezing and thawing cycle in a salt solution with a concentration of 3.7%were tested.In this study,the changes of cubic compressive strength,dynamic e-lastic modulus and stress-strain curves of recycled concrete after different times of salt-freezing cycles were compared and analyzed.The test results show that with the increase of freeze-thaw cycles,the loss rate of compressive strength increases gradually,which is 8.69%,21.57%and 33.33%,respectively,and the relative dynamic elastic modulus decreases by 2.61%,13.00%and 27.52%,respectively.The results show that the compressive strength and relative dynamic elastic modulus decrease with the increase of freeze-thaw cycles.After 90 cycles of salt freezing,the peak stress reduction rate of recycled concrete reached 43.80%.
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