American Concrete Institute (ACI) defines Mass Concrete as:

“Any volume of concrete with dimensions large enough to require that measures be taken to cope with the generation of heat from the hydration of cement and attendant volume change to minimize cracking”.

In mass concrete structures, the temperature rise caused by cement hydration can be significant, leading to internal thermal expansion. At the same time, heat is rapidly dissipated from the exterior surfaces, resulting in large temperature gradients. These gradients induce tensile stresses at the concrete surface.

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