Evaluation of Internal Curing of HPC Using Lightweight Aggregates and Other Techniques

Traditional external concrete curing methods don't work well for high performance concrete (HPC), due to their low water content (autogenous shrinkage and internal dessication), and their low permeability that prevents external water sources from reaching the interior of the concrete element in need of curing. To resolve these problems, internal curing (IC) can be used to supply water from an internal source. IC introduces a curing agent such as an admixture or special aggregate into the concrete mixture. Most commonly, this is a water-saturated lightweight aggregate, but strength and durability concerns still prevail. Alternative approaches to IC are sought in this study, with the goal of producing HPC with improved strength, durability, permeability, and overall performance