Thermal Properties of Concrete in the Development of Precast Walls for Thermoelectricity Generation Utilizing Thermoelectric Principles

This study aims to develop a concrete model for prefabricated walls intended for future thermoelectric power generation. Three-layer composite concrete samples were fabricated to achieve the maximum temperature difference between layers. These samples can be applied to the thermoelectric principle, generating electricity by converting heat energy from the temperature difference occurring at two points between the concrete layers. The concrete layers were fabricated by replacing 10% of Portland cement with bagasse ash and 5% of sand with graphite powder. The samples were then subjected to heat absorption tests over time to measure temperature differences. The results suggest that the three-layer composite concrete samples consisting of graphite powderbagasse ash-graphite powder (G-B-G) achieved a temperature difference 1.59 times greater than that of Portland cement concrete samples. This finding indicates the potential for higher thermoelectricity generation compared to Portland cement concrete, while also reducing electricity use, and improving heat insulation in buildings. In addition, the mechanical properties were tested by measuring the compressive strength and flexural strength of the concrete samples to assess their practical suitability.