__full__ — Thermal Stress Crack

Understanding Thermal Stress Cracking: Mechanics, Causes, and Mitigation

Mass concrete dams are highly susceptible. Hydration of cement generates heat in the core, while the surface remains cooler. This produces: thermal stress crack

At its core, thermal stress is driven by the natural expansion and contraction of materials as they heat and cool. When a temperature gradient exists—meaning one part of an object is significantly hotter or colder than another—the resulting uneven expansion creates internal tension. If this movement is restricted by the surrounding material or fixed supports, the stress accumulates. Cracking occurs when this stress surpasses the material's ability to hold itself together. Common Manifestations Across Industries Understanding Thermal Stress Cracking: Mechanics