Assessment of Lightweight Concrete Thermal Properties at Elevated Temperatures

Structural lightweight concrete (LWC) has recently acquired research importance because of its good thermal insulation properties. However, there is a lack knowledge about properties at elevated temperatures. The properties, such as conductivity and specific heat, porous LWC vary depending on the aggregates, air voids, moisture content in question. To study these effects, this paper, we measured three types structural LWCs different temperatures, combining characterization techniques, namely, differential scanning calorimetry (DSC), laser flash analysis (LFA), modified transient plane source (MTPS). Bulk density porosity were also evaluated. Specific heat analyzed by DSC technique from 20 to 1000 °C MTPS 160 °C. Thermal studied using LFA techniques temperatures ranging 100 300 °C, respectively. results indicate that are highly affected content, temperature, porosity. For LWC, current Eurocodes 2 4 assume constant value (840 J/kg°C). This reveals variability near 150, 450, 850 due endothermic reactions. Furthermore, for low higher porosity, conductivity, while, high lower conductivity. Thus, should be updated accordingly. contributes deeper understanding more accurate prediction LWC’s effects