Freeze-thaw damage and life prediction of fiber recycled coarse aggregate concrete
By adding recycled coarse aggregate into PVA fiber concrete,the effects of different recycled coarse aggregate replacement rates on concrete mechanics and frost resistance were studied,and the frost resistance of concrete was predicted.The results show that with the increase of the replacement rate of recycled coarse aggregate,the compressive strength and splitting tensile strength of concrete show a trend of first decreasing,then increasing,and then decreasing,and the tension-compression ratio roughly shows a trend of first decreasing and then increasing.The relationship between the fitting parameters a and b of the concrete freeze-thaw damage model and the replacement rate of recycled coarse aggregate was linearly fitted using the Design-Expert software,and it was found that there was a good correlation between the two.Based on the gray system theory GM(1,1)model,the relative dynamic elastic modulus of concrete is analyzed by gray system theory.The results show that the accuracy of R0 and R30 models is rated as class II,and the other groups are rated as class I;regardless of the recycled coarse aggregate No matter what the replacement rate is,the accuracy of DGM is the largest,and the accuracy of ODGM is the smallest;when the replacement rate of recycled coarse aggregate is greater than 50%,the replacement rate of recycled coarse aggregate has little effect on the frost resistance durability of concrete.
recycled coarse aggregateresponse surfacegrey system theoryGM(1,1)modellife prediction
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