Mechanical and Thermal Properties of Recycling Lightweight Pervious Concrete

This paper presents an investigation of the use of recycled lightweight aggregate from waste autoclaved aerated concrete block to make lightweight pervious concrete (LWPC). The effects of fine sand (SA) and fly ash (FA) as additive materials on LWPC properties were also studied. The density, total void ratio, water permeability, compressive strength, splitting tensile strength, flexural strength, thermal conductivity, and surface abrasion of LWPC were tested. The results showed that all LWPCs had low density of 775-900 kg/m(3) and low thermal conductivity coefficient of 0.15-0.27 W/m K. The use of SA and FA improved the compressive strength, splitting tensile strength, flexural strength, and abrasion resistance of LWPC, while the total void ratio and water permeability seemed to reduce. The low thermal conductivity and low density of LWPC with reasonable 28-day compressive strength of 1.9-4.1 MPa suggested that it is suitable for use as thermal insulating concrete.