Optimizing Strength and Sustainability: The Behavior of Recycled Alkali-Activated Concrete Across Temperature and Curing Regimes

The construction industry has increasingly turned to sustainable solutions to minimize its environmental impact. alkali-activated represents a green alternative to traditional concrete, while recycled aggregate (RA) offers a means to reuse construction and demolition waste. This paper explores the potential of geo-concrete with recycled aggregate (GOCRA) as a sustainable construction material, emphasizing its environmental benefits, mechanical properties, and studies the affected of different curing temperature on strength. Cement-free geopolymer (GOC) composite composed of a variety of waste materials with a high concentration of Al ₂ SiO ₃ and Na ₂ SiO ₃ /NaOH (alkali-activated silica) are a sustainable material with lower greenhouse gas emissions compared to OPC. Meticulously assesses using geopolymer binders in place of cement, and replacement of different mixtures of aggregates, the combinations that were used included natural coarse aggregate concrete (basalt), also mentioned recycled coarse aggregate concrete (RAC) which totally substituted natural aggregates such as crushed concrete (CC), and crushed ceramic (CE). The results showed that geo-concrete with recycled aggregate (GOCRA) showed Slight effect for ordinary geo-concrete in mechanical characteristics, including compressive, tensile, and flexural strength that were decreased by 10%, 8.7%, and 8%, respectively for (CC), and were decreased by 8.9%, 7.8 %, and 6.5%, respectively for (CE) as they were compared to the control concrete samples. the compressive strength showed that the best strength occurred When samples were cured at 60 °C for 60 hours. geopolymer binder have been successfully analyzed using scanning electron microscopy (SEM) technique Micro- images demonstrated how the geopolymer binder formed a strong bond with the recycled aggregate. These findings emphasize the need for additional research in this area to promote environmentally friendly building techniques.