Thermal Cracking Mitigation in Mass Concrete on Preplacing Aggregate Concrete Method with Pozzolanic Materials

Fly ash is known as a waste from burning coal which has answered the issue of global warming to be an alternative constituent material for concrete. Casting on mass concrete has a major problem like the thermal cracking caused by the hydration process in the cement chemical component. The prevention solution is using fly ash for a mixed design. Moreover, the casting method using the preplacedd aggregate method could be able to control the heat of hydration which lowers the temperature of the concrete by minimalizing the friction between the coarse aggregate particles during the mixing operation. This study aims to analyze the behaviour of surface and core temperatures in mass concrete using the preplacedd aggregate concrete method and substituting part of the cement with fly ash. The result from the study showed that the temperature behaviour of preplacedd aggregate concrete for mass concrete decreased and slowed the temperature rise if compared to the conventional methods. Moreover, the partial substitution of class C fly ash in the concrete mixture leads to reduce the temperature of the mass concrete.