Mechanical and microstructural performance of hybrid waste brick powder and glass powder concrete after exposure to 200 °C

The use of waste brick powder (WBP) and waste glass powder (WGP) in concrete reduces its environmental impact and improves its performance. In this regard, four concrete mixes with different percentages were made to evaluate their performance individually and synergistically. Fresh properties were measured through the slump test, and hardened properties were assessed through compressive strength, tensile strength, ultrasonic pulse velocity, water absorption and density after exposure to 200 °C. Furthermore, microstructure was examined by Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results indicate that WBP reduced workability, attributed to its porous particles. Furthermore, the GP slightly improved in workability and strength. In contrast, the hybrid mix made with 10% WBP and 15%WGP showed a synergistic effect with workability comparable to the control. Also, the hybrid mixes improved splitting-tensile and compressive and strengths by 24.2% and 7.0%, respectively. XRD and FTIR indicated that both WBP and GP participate in pozzolanic reactions, contributing to a denser matrix. The findings also suggest that WBP and GP could support the circular use of construction waste, but further validation is required to support these claims.