Performance of Composite Modified Permeable Concrete with Nano-Silicon and Polypropylene Fiber
In order to improve the comprehensive performance of permeable concrete,nano-silicon and polypropylene fiber were added to permeable concrete to study the performance of the composite modified permeable concrete.Firstly,the influence of single-doped nano-silicon on the performance of cement paste and permeable concrete was studied,and the content of nano-silicon and the optimal water-to-binder ratio were determined.On this basis,different proportions of polypropylene fiber were mixed,and the reasonable content of polypropylene fiber was determined.The results show that nano-silicon improves the porosity of permeable concrete and increases the optimal water-to-binder ratio.When the content of nano-silicon is 0.5%,and the water-to-binder ratio is 0.32,the compressive strength of permeable concrete is the highest.Based on this ratio,the maximum compressive strength can be obtained by adding 1.0 kg/m3 polypropylene fiber,and the compressive strength after 7 d and 28 d is increased by 29.9%and 42.2%,respectively.Adding 1.5 kg/m3 polypropylene fiber has the most significant effect in improving the frost resistance of permeable concrete.After 300 freeze-thaw cycles,the residual rate of compressive strength and flexural strength are 62%and 75%,respectively,which are far higher than 40%and 55%of single-doped nano-silicon.
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