Abstract
This paper presents experimental results that can be applied to select a possible phase change material (PCM), such as a latent heat material (LHM), to control the hydration heat in mass concrete structures. Five experimental tests (microconduction, simplified adiabatic temperature rise, heat, and compressive strength tests) were conducted to select the most desirable LHM out of seven types of inorganic PCM used in cement mortar and to determine the most suitable mix design. The results of these experimental tests were used to assess the feasibility of using PCM to reduce hydration heat in mass concrete that was examined. The experimental results show that cement mortar containing barium- [Ba(OH)2 ·8H2O] based PCM has the lowest amount of total hydration heat of the cement pastes. The barium-based PCM provides good latent heat properties that help to prevent volume change and microcracks caused by thermal stress in mass concrete.
Highlights
Mass concrete has a high potential to crack due to the temperature difference between the inside and the outside of concrete structures that results from hydration after a large quantity of concrete is placed
This study focuses on evaluating the applicability of seven different types of inorganic phase change material (PCM), as shown in Table 2, to conditions that are similar to those used for concrete materials
After selecting three possible PCMs based on the Series 1 test results, the characteristics of the hydration heat of these three types of PCMs were examined in Series 2 testing by conducting a simple adiabatic temperature rise test of the mortar mixtures
Summary
Mass concrete has a high potential to crack due to the temperature difference between the inside and the outside of concrete structures that results from hydration after a large quantity of concrete is placed. Latent heat and phase transition temperatures differ from one substance to another, which means that each type of latent heat material (LHM) has different latent heat and phase transition temperatures For this reason, LHMs that are selected according to specific usage can be applied in many areas, including energy-related, chemical, and construction industries. The high heat absorbance or radiation effect of latent heat can help preserve original energy and maintain a constant temperature. These characteristics of LHM can stop the rise in temperature of a substance that radiates heat. These characteristics of LHM in mass concrete play a role in mitigating the radical fluctuation of hydration temperature and preventing retarding effects with the use of low heat binder in cement mixtures
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