Heat-stored calcined clay limestone cement: Role of microencapsulated n-octadecane with calcium carbonate shell

Kunyang Yu, Yunshi Pan, Minjie Jia, Zilong Wang, Yan Xia, Yingzi Yang and Yushi Liu

Energy, 2025, vol. 334, issue C

Abstract: Heat-stored functional cement-based composites with low-carbon cementitious material and microencapsulated phase change materials (PCMs) have shown great potentials in energy conservation and emission reduction of buildings. In this study, a novel heat-stored cement-based composite system was proposed by incorporating microencapsulated PCMs into limestone calcined clay cement (LC3), in which a microencapsulated n-octadecane with calcium carbonate shell (ODE@CaCO3) was synthesized via in-situ self-assembly method and it was employed as a substitute for limestone in LC3. The micromorphology, chemical compatibility and phase transition properties of ODE@CaCO3 were investigated. ODE@CaCO3 had the latent heat of 86.0 J/g and the phase transition temperature of 26.8 °C, and its average particle size was 2.19 μm. Moreover, the experimental results of mechanical property indicated the 28d compressive strength of heat-stored LC3 containing ODE@CaCO3 (i.e., limestone was completely replaced) was 26.7 MPa, which was decreased by 48.2 % as compared to the pure heat-stored LC3. The analysis on hydration reaction and microstructure evolution of heat-stored LC3 was carried out, and the influence mechanisms behind ODE@CaCO3 on the mechanical strength were unveiled. In overall, this work provided novel insights into the optimized design of low-carbon heat-stored construction materials with PCM.

Keywords: Phase change materials; Limestone calcined clay cement; Heat-stored construction materials; Energy conservation (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:334:y:2025:i:c:s0360544225034851

DOI: 10.1016/j.energy.2025.137843

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