Properties of pervious concrete incorporating recycled concrete aggregates and slag

摘要

The properties of pervious concrete made with recycled concrete aggregates (RCA) were investigated. Natural aggregates were replaced by RCA at levels of 0, 10, 20, 40, 70, and 100%. Slag was also incorporated to enhance the performance and sustainability of the concrete mixtures. Slump, hardened density, total void content, porosity, permeability, compressive strength, tensile splitting strength, flexural strength, and abrasion resistance were determined. Results showed that the RCA replacement led to an increase in total void content, porosity, and permeability, while a decrease in slump and hardened density was noted. The mechanical properties and abrasion resistance were adversely affected due to the weak RCA and aggregate-mortar interface. The clogging potential of pervious RCA concrete was also assessed over a simulated 20-year lifespan. Permeability could be restored to acceptable, but lower, levels through pressurized water washing. RCA limited the restoration of permeability of pervious concrete, while slag facilitated it. Analytical models were developed to correlate physical, transport, mechanical, and durability properties. Codified equations were assessed for their applicability. Experimental findings highlight the ability to use pervious RCA concrete in pavement applications. (C) 2019 Elsevier Ltd. All rights reserved.