Thermal and Mechanical Performance of PCM-Modified Concrete: An Experimental Study

This research investigates the integration of phase change materials (PCMs) into concrete to enhance their thermal properties while maintaining mechanical integrity for sustainable building applications. The study specifically examines two commercially available PCMs: CT29P (CrodaTherm ME29P) and M24D (Micronal 24D). The investigation focuses on evaluating workability, heat of hydration, mechanical properties, and thermal heat storage capabilities of PCM-modified concrete compared to traditional concrete formulations. Samples containing varying PCM concentrations (0%, 5%, 10%, 15%, and 20% by mass of cement) were prepared and subjected to comprehensive testing. Results demonstrate that PCM incorporation significantly affects concrete workability, necessitating superplasticizer addition for optimal mix consistency. Literature analysis indicates that PCM-incorporated concrete exhibits reduced heat of hydration by 2-5°C and delays peak hydration temperature by 1-2 hours, suggesting potential applications in thermal crack mitigation in mass concrete structures. While compressive strength decreases at higher PCM concentrations, optimal performance was maintained with 10% PCM addition combined with 5% silica fume replacement by cement mass. The study reveals enhanced thermal mass in PCM concrete, resulting in temperature fluctuation reductions of 3-5°C and improved building energy efficiency. These findings establish PCM-enhanced concrete as a viable solution for creating energy-efficient and thermally comfortable structures, advancing sustainable construction practices.