Investigation on mechanical properties of gobi aggregate concrete under triaxial compression
Preparation of gobi concrete from gobi waste produced in Urumqi airport reconstruction and expansion project can promote the utilization of gobi waste.In order to investigate the mechanical properties of gobi aggregate concrete under complex stress,gobi aggregate concrete were tested under triaxial compression to investigate the effects in the aggregate type,gobi fine aggregate replacement percentage,lateral confining pressure on mechanical properties.The failure modes of specimens were observed,the effect of changing parameters on the stress-strain curves,peak stress,elastic modulus and peak strain of specimens were analyzed.The results showed that the lateral confining pressure was the main parameter affecting the failure mode of concrete.With the increase of confining pressure,the failure mode of concrete transits from tensile failure to shear failure.For the stress-strain curve,the gobi aggregate concrete was more plump than natural one,and more plump with the increase of gobi fine aggregate replacement percentage,confining pressure,water cement ratio and the maximum particle size of gobi coarse aggregate.With the increase of the replacement percentage of fine aggregate and the water cement ratio,or the decrease of the maximum particle size and confining pressure of coarse aggregate,the peak stress and elastic modulus of gobi aggregate concrete decreased while the peak strain increased.When the replacement percentage of gobi fine aggregate was not more than 50%,the mechanical properties of gobi aggregate concrete were equivalent to those of natural one.The effect of gobi fine aggregate replacement percentage and aggregate type on the triaxial mechanical properties of gobi aggregate concrete was more significant than that of water cement ratio and coarse aggregate size.The formulas for calculating the triaxial mechanical properties of gobi aggregate concrete was proposed and agreed well the results of experiment results.
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