Performance Optimization of Pervious Concrete for Pavements Using Treated Recycled Aggregates and Cement Replacement with Silica Fume

Abstract

This study evaluates the influence of the mineral addition of microsilica as a partial binder replacement, in combination with the partial substitution of natural aggregates with treated recycled concrete aggregate (TRCA). This process aims to optimize the performance of pervious concrete to mitigate the loss of compressive strength in rigid pavement under rainy conditions while promoting the recycling of old concrete. Natural aggregates were partially replaced by TRCA at a 25% ratio, and cement was replaced with silica fume at concentrations of 0%, 5%, and 7%. Four mixtures were prepared following the ACI 522R-10 standard, with final results showing compressive strengths ranging from 15 to 23 MPa, meeting the requirements of the CE.010 standard. Infiltration rates ranged from 0.84 to 1.19 cm/s, within the allowable range. It is concluded that the use of TRCA along with silica fume improves compressive strength, although it reduces the infiltration rate due to decreased porosity.