Mechanical properties of pervious concrete prepared from recycled aggregates treated by three methods

Nowadays, every country produces a large amount of construction waste every year, which is not only difficult to handle but also a huge waste of resources (Naseri et al. 2022). Recycling construction waste and applying it as recycled aggregates (RA) in construction can bring huge economic and environmental benefits (Ma et al. 2022). Pervious concrete (PC) is also an environmentally friendly road construction material that can help cities quickly remove stagnant water and mitigate the heat island effect (Strokova et al. 2022). Applying RA to PC to form recycled aggregate pervious concrete (RAPC) can bring the above-mentioned comprehensive effects and has a good future for application. But the combination of PC and RA leads to worse mechanical properties of RAPC (Yang et al. 2022). Therefore, it is necessary to find a way to treat RA so as to increase the performance of RA and improve the mechanical properties of RAPC. This study employs three different methods to treat RA: sodium silicate-silane composite modification (SS), volcanic ash slurry modification (VS), and a combination of volcanic ash slurry and sodium silicate-silane composite modification (VS-SS). Subsequently, PC is prepared using the treated RA to investigate the impact of these three treatment methods on the mechanical properties of RAPC.