Study on compressive strength of desert sand concrete after high temperature with randomly distributed polygonal aggregates containing interface transition zone
To study the effects of specimen size,interface transition zone(ITZ)thickness and strength,and desert sand replacement ratio(DSRR)on the compressive strength of desert sand concrete(DSC)after experiencing high temperature,the DSC was considered as a three-phase composite material and a finite element model with ITZ randomly distributed polygonal aggregate was developed.Numerical simulation of the uniaxial compression damage process of DSC after high temperature was performed using ANSYS.The results show that the simulation results are in good agreement with the experimental results with errors ranging from-2.59%to 3.13%.The compressive strength of DSC decreases with the increase of specimen size after high temperature,and the strength decreases in the range of 1.44%to 4.13%.The compressive strength gradually decreases with the increase of ITZ thickness.The compressive strength basically increases lin-early with the increase of ITZ strength.The compressive strength is optimal when the DSRR is 40%,and the research results can provide the theoretical basis for DSC engineering applications.
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