Research on the Performance of Regenerated Permeable Concrete with Composite Straw Fiber and Fly Ash
In order to improve the engineering performance of recycled pervious concrete(RPC),corn straw fiber(CSF)and fly ash(FA)were selected to optimize the mixing ratio.Based on the tests of compressive strength,flexural strength,continuous porosity,water permeability coefficient and freeze-thaw cycle,the effects of CSF and FA on the mechanical strength,water permeability and frost resistance of recycled pervious concrete were systematically investigated.The results show that the incorporation of CSF can effectively enhance the mechanical properties and frost resistance of RPC.Appropriate FA is beneficial to improve the mechanical properties of RPC,but it has a certain effect on its frost resistance.The water permeability of RPC is weakened by adding FA and CSF,but they all meet the design requirements of relevant specifications.Combined with the performance variation of RPC,it is recommended to use a composite ratio scheme of 10%FA and 0.35%CSF,which is beneficial to improve the service performance of RPC.
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