Effect of water saturation on mechanical properties of recycled concrete and micro-mechanism analysis
In order to explore the feasibility of recycled concrete application in hydraulic buildings and improve the efficiency of resource utilization,the mechanical properties of recycled aggregate concrete with different water saturation degrees under four aggregate substitution rates were experimentally investigated.The micro-mechanism of recycled concrete was analyzed by combining nuclear magnetic resonance and electron microscope scanning tests.The results show that the modulus of elasticity of recycled concrete gradually increase with the raise of aggregate substitution rate and water saturation degree.The compressive strength,peak strain and split tensile strength gradually decrease.The analysis of T2 spectrum curve of the specimen find that the number of small pores in the specimen with 0％,30％,50％and 70％aggregate replacement rate accounted for 83％,77％,82％and 84％,respectively.It is found by scanning electron microscope that the density of concrete matrix decrease with the increase of regenerated aggregate substitution rate.The concrete matrix is easily permeated by free water,which will affect the mechanical properties of the recycled concrete.The research results can provide reference for the application of recycled concrete in hydraulic structures.
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