Influence of Recycled Asphalt Pavement Aggregate on the Mechanical Properties of Very-High Strength Heat-Resistant Concrete

Abstract

Very-High Strength Heat-Resistant Concrete (VHSHRC) endures elevated temperatures for extended durations without performance deterioration. Furthermore, it exhibits enhanced resistance to spalling, loss of strength, and diminished durability. The use of VHSHRC is particularly evident in scenarios involving prolonged exposure to elevated temperatures, such as power plants, industrial facilities, and areas susceptible to fires. The increasing need for resource-efficient building materials in concrete structures demands the assessment and performance implications of integrating Recycled Asphalt Pavement (RAP) aggregate into Very High Strength High-Performance Concrete (VHSHRC) mixes. The use of RAP aggregate is an exemplary option for constructions aiming to reduce environmental impact, optimise resource efficiency, and conform to the increasing focus on sustainability. This research employed RAP aggregate as a partial substitute for quartz sand at rates of 4%, 5%, 6%, and 7%. Mechanical tests were performed on VHSHRC exposed to various high temperatures and exposure periods. The research findings revealed that the optimal ratio of RAP aggregate was 5%, resulting in increases in compressive strength and split tensile strength of 3.34% and 3.68%, respectively.