Study on mechanical properties of steel fiber-expanded perlite concrete under low temperature environment
To study the mechanical properties of steel fiber-expanded perlite(SF-EP)concrete under low temperature conditions,this study focuses on three key parameters:temperature(23℃,-10℃,-20℃,and-30℃),steel fiber volume fraction(0％,0.5％,1.0％,and 1.5％),and expanded perlite replacement ratio(0％,10％,20％,and 30％).Using orthogonal experimental design,a total of 32 groups of 96 test blocks are prepared and subjected to compressive and splitting tensile tests respectively,and the measured data such as failure mode and ultimate bearing capacity of SF-EP concrete under load are obtained.These tests reveal the failure modes and ultimate bearing capacities of SF-EP concrete under load.Based on this,the mechanical properties of SF-EP concrete under low temperature environment are analyzed,and the influence of various factors on the test results is obtained by range analysis.The results show that as temperature decreased,both the compressive and splitting tensile strengths of SF-EP concrete increased,with the most significant enhancement at-30℃.An increase in steel fiber volume fraction help mitigate crack formation,enhancing the toughness and strength of the concrete.Among the three parameters,temperature have the greatest influence on the mechanical properties of SF-EP concrete follow by steel fiber volume fraction,while the expanded perlite replacement ratio have a relatively minor effect on both tensile and compressive strengths.The failure mechanism of SF-EP concrete is further analyzed using electron microscopy and experimental data.Based on these findings,it is recommended to use a steel fiber volume fraction of 1％and an expanded perlite replacement ratio of 10％in concrete production to effectively enhance its mechanical property.
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