DEVELOPMENT OF REFRACTORY CONCRETE USING GLASS GRINDING WASTE SAND

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This study investigates the utilization of glass grinding waste sand as an alternative fine aggregate in the formation of refractory concrete. Experimental refractory-concrete samples were subjected to sintering at 1200 °C, followed by a comprehensive evaluation of their physical and mechanical properties. The parameters assessed included flexural strength, volume density, shrinkage/expansion behavior upon drying and firing, thermal shock resistance, and thermal conductivity, following Vietnamese standards. Additionally, the mineral composition was determined using X-ray diffraction, while the microstructural characteristics were analyzed via scanning electron microscopy. Experimental findings indicate that incorporating 5 wt.% of glass grinding waste sand enhances the degree of sintering in refractory concrete at elevated temperatures while maintaining its essential refractory properties. The XRD analysis revealed the presence of α-Al2O3 and γ-Al2O3 phases, contributing to the refractory concrete’s improved heat resistance and thermal shock resistance. The SEM analysis corroborated these findings by illustrating the microstructural modifications imparted by the glass grinding waste sand. Incorporating glass grinding waste sand at an optimal concentration of 5 w/% promotes sintering at high temperatures and preserves the critical refractory characteristics of concrete. This study underscores the potential of glass grinding waste sand as a viable alternative fine aggregate for refractory concrete, contributing to material sustainability and performance improvement.