复掺秸秆纤维和粉煤灰再生透水混凝土的性能研究

Research on the Performance of Regenerated Permeable Concrete with Composite Straw Fiber and Fly Ash

为了改善再生透水混凝土(RPC)的工程性能,选用玉米秸秆纤维(CSF)和粉煤灰(FA)进行复掺配比优化设计,基于抗压强度、抗折强度、连续孔隙率、渗水系数及冻融循环等试验,系统考察了复掺CSF和FA对再生透水混凝土力学强度、透水性能及抗冻性能的影响规律。研究结果表明:掺入CSF能够有效增强RPC的力学性能和抗冻性能;适宜FA有利于提升RPC的力学性能,但对其抗冻性能有一定影响;复掺FA和CSF对RPC的透水性能有所削弱,但均满足相关规范设计要求;结合RPC各项性能变化规律,推荐采用10%的FA与0.35%的CSF复掺配比方案,有利于提升RPC的服役性能。

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.