Akademik Veri Yönetim Sistemi
International Conference on Civil and Mechanical Engineering (ICCME-24), Edinburgh, İngiltere, 8 - 09 Ekim 2024, ss.32-41
Recycled concrete aggregate (RCA) is increasingly being generated worldwide and its use in construction may improve sustainability by reducing CO2 emissions, energy and natural resource consumption attributed to concrete production. For this reason, alkali-activated materials (AAM), in which industrial wastes are used as the binder instead of cement, with the use of RCA instead of natural aggregates can improve sustainability concerns. Unlike common activators such as NaOH and Na2SiO3, this research employs Na2CO3, which causes less energy consumption but is a weaker activator compared to its alternatives. Na2CO3 was incorporated into the mix as one-part. In this context, within the scope of this study, 4 different series were determined by substituting RCA with sand at 0-5-10-15%. The disadvantages of Na2CO3 activation were improved in this study with the use of 10% reactive MgO (r-MgO) substitution with slag as a constant in all series. This study aims to evaluate the physical and mechanical properties associated with the use of RCA as fine aggregate. The consistency of the mixtures produced, and 28-day compressive and flexural strength development were determined, and the void structure was analyzed by ultrasonic pulse velocity (UPV) and capillary and gel pore volume determination together with parameters such as capillary water absorption, and water absorption by volume, which are thought to cause a difference with the use of RCA. The findings of the study showed that RCA used as a fine aggregate in substitution with sand led to a decrease in consistency as the substitution rate increased, while significantly increasing the strength values.