Temperature Rise of Mass Concrete Containing Class N Pozzolan

Thermal effects from hydration and the environment can lead to thermal gradients within the concrete section and induce thermal cracking. Temperature effects are especially important in mass concrete, where the size of the placement can produce large amounts of heat and relatively little surface area to dissipate it. Even in smaller placements, concrete containing high cement contents or supplementary cementitious materials (SCMs) such as silica fume can produce high temperatures. Some Reclamation Regions are experiencing a shortage in Class F fly ash which is usually the SCM used to lower the heat of hydration. This research project reports the adiabatic temperature rise and heat of hydration for concrete containing Class N pozzolan from a source near several Reclamation projects. The data from this report is compared to mixtures containing Class F fly ash.