Experimental study on the dynamic and static mechanical properties of steel fibre concrete in low and ultra-low temperature environments
Concrete with different fibre volume additions(0.5%,1.0%and 1.5%)were tested at ambient,low and ultra-low temperatures,and the dynamic mechanical properties were tested at three strain rates using a 75 mm split Hopkinson compression bar device(SHPB),to analyse the effects of fibre content,temperature interval and strain rate effects on the mechanical properties of concrete.The test results showed that the flexural strength of concrete at low and ultra-low temperatures increased by 41.1%and 65.7%when the steel fibre content was 1%.In the dynamic mechanical experiments,the steel fibre concrete in the ultra-low temperature environment at a strain rate of 147 s-1 had a higher dynamic compressive strength of 159.7 MPa.In addition,the low and ultra-low temperature environments increase the strain rate sensitivity of the steel fibre concrete leading to an increase in the dynamic increase factor.
concreteultra-low temperaturemechanicsHopkinson compression bar
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