الفهرس 
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Abstract
Utilization of waste crushed bricks (WCB), which are obtained from brick factories and demolition waste as coarse and fine aggregate for preparing concrete, is an adequate strategy to reuse them and save natural resources to achieve environmental sustainability. Consequently, this study investigates the possibility of the production of eco-friendly structural lightweight concrete (SLWC) with a 100% replacement of WCB. Different contents (5%, 10%, and 15%) of supplementary cementitious materials (SCM) such as silica fume (SF), fly ash (FA), metakaolin (MK), and slag (S) as a replacement by weight of cement were investigated. The slump test, dry density, and mechanical properties (compressive, splitting tensile, and flexural strengths), also elevated temperature resistance and water absorption, were evaluated. Microstructure tests, including thermogravimetric analysis (TGA), X-ray diffraction (XRD) and scanning electron microscopy (SEM), were performed. Test temperatures corresponding to 200 °C, 400 °C, and 600 °C were used to test the fire resistance of the concrete. The results indicated that SLWC was obtained using WCB as a 100% replacement of aggregate and by using 15% MK and 15% SF as alternatives to cement, with a 39.5 and 41.5 MPa compressive strength, respectively. Incorporation of 15% slag as cement replacement exhibited the best performance after 600 °C exposure compared to other fine materials. The SEM images proved that there was a good bond between WCB and SCM, which enhanced the bond between coarse aggregate and cement paste and improved transition zone characteristics. It has been demonstrated that combining SCM with WCB as coarse and fine aggregates in eco-friendly concrete is a promising method with application potential.