Abstract Concrete is the most widely used construction material worldwide and, at the same time, one of the most resource- and emission-intensive. In parallel, the annual generation of millions of tons of mineral-based construction waste underscores the urgent necessity to recycle concrete aggregates. According to EN 1992-1-2 1, concrete properties must be verified through experimental testing when the substitution rate of recycled concrete aggregates exceeds 20%. The research presented in this study investigates the fire performance of two types of recycled aggregate concrete, T1 and T2, with substitution levels of 45%, 70%, and 100% for T1 and 35%, 70%, and 100% for T2. The experimental program investigates both the thermomechanical behavior of concrete through hot compression tests and its susceptibility to fire induced spalling. The results indicate that the intrinsic properties of the aggregates exert a greater influence on high temperature performance than the proportion of recycled aggregates used.
Jalaeeyan et al. (Thu,) studied this question.