Study on the anti-skid attenuation performance of carbonized artificial solid-waste aggregates asphalt pavement

To improve the recycling rate of industrial solid waste and reduce the impact of land occupation and heavy metal leaching, together with the “Dual Carbon” development strategy, steel slag powder, fly ash, and cement were used to create artificial solid waste aggregates (ASWA) in this paper, which were then treated using an accelerated carbonation apparatus. Thermal analysis, SEM, and XRD analysis were used to explore the microstructure and internal phase composition of ASWA before and after carbonation. Based on the Marshall design program, a qualitative and quantitative analysis was conducted on the feasibility of asphalt mixtures with ASWA as a partial substitute for natural aggregates. The results indicated that accelerated carbonation led to the depletion of internal Ca-based and Mg-based compounds and the formation of carbonate crystals, plus the hydration products, microstructure densification was enhanced, and the volume expansion rate was reduced. Concurrently, 12 h carbonation could acquire the optimal CO2-sequestration efficiency with an 82.23% drop in expansion rate, a 31.92% and 5.59% increment in anti-rutting performance and water stability for the ASWA-asphalt mixture. Additionally, from the macro and micro perspectives of anti-skid performance, the anti-skid attenuation rate was retarded by approximately 16.06%-19.55% and 9.15%-15.18% based on accelerated wear tests. Overall, this paper lays the foundation for solid waste’s resource reuse and CO2 sequestration in asphalt pavement.