Thermal diffusivity measures how quickly heat passes through a material, which is crucial for understanding how concrete responds to changes in temperature. It is influenced by the concrete’s composition, including the type and density of aggregates, cement hydration levels, and the presence of voids or cracks. A high thermal diffusivity in concrete indicates that heat can travel through it rapidly, which can be advantageous for structures exposed to quick temperature changes. However, it can also mean that thermal stresses develop more quickly, potentially leading to cracks and other forms of structural damage.