Thermal stress in mass concrete is a critical factor that is used in determining serviceability, and long-term durability of concrete. Phase change material (PCM) can be considered to mitigate such thermal stress in massive concrete structures. Based on related research results, barium-based PCM was selected as the latent heat binder. This study focuses on the appropriate mix design of selected PCMs. The test results indicate that the application of barium-based PCM in mass concrete mixtures is effective in controlling the hydration heat with manageable negative effects on the mechanical properties and durability of the concrete. Based on the experimental results, the proposed mixing methods were implemented at a construction site. The maximum temperature at the core of the structure was maintained at around 58 degrees C, which indicates that the hydration temperature could be controlled effectively. (C) 2015 Elsevier B.V. All rights reserved.