Abstract
In this study, phase change material (PCM) was used to control the heat of hydration of mass concrete, and the study aimed to evaluate the resulting fundamental and thermal properties of mass concrete with PCM. To evaluate the feasibility of adding PCM to concrete with various binder conditions for mitigating the hydration heat of mass concrete, mechanical and adiabatic temperature rise tests were conducted. The test results showed that the use of PCM did not significantly influence air content, while it slightly reduced flowability. For initial setting properties of concrete, it was found that the initial and final time were delayed when PCM was added. Even though compressive strength was slightly reduced when PCM was added into concrete, the strength development properties of concrete were more closely associated with the strength development properties of the binder. The adiabatic temperature rise test results showed that the addition of PCM resulted in an approximately 15–21% decrease in temperature rise of concrete. From the thermal analysis results, it is noted that thermal cracking probability could be decreased by adding PCM into concrete mix.
Highlights
As urbanization, economic development, and high-rise buildings have increased due to insufficient land areas or various global demands, large-scale mass concrete construction has increased, such as mat foundations of skyscrapers, bridge piers, and power plant structures
When mixed with phase change material (PCM), the air content slightly increased in the OPC mixture, while it decreased in the LHC mixture and showed no significant change in the CBF mixture
This study aimed to investigate the effect of adding PCM on the fundamental properties of concrete and reducing the hydration heat in three binder conditions
Summary
Economic development, and high-rise buildings have increased due to insufficient land areas or various global demands, large-scale mass concrete construction has increased, such as mat foundations of skyscrapers, bridge piers, and power plant structures. A critical issue related to mass concrete is that it is difficult to ensure its quality due to cracks caused by the thermal gradient between the center and the surface because concrete is exposed to various environmental effects. As material-based technology for reduction of hydration heat is not noticeably effective to control the thermal stress and cracks of massive structures, concrete is commonly cast over two or three layers. These layered casting method would cause problems such as requiring additional measures for bonding strength in the cold joints and delays in the construction period (Kim et al 2008)
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