The Influence of Phase Change Aggregate Dosage on the Performance of Cement-based Self-insulating Wall Materials under Natural Curing Conditions

DOI: https://doi.org/10.62517/jcte.202506407

Author(s)

Qiuwang Jiang1, Liang Zhao1,*, Liping Tian2, Xiaolong Li1, Xianliang Yin1

Affiliation(s)

1College of Civil Engineering and Architecture, Yangtze Normal University, Chongqing, China 2Shaanxi Province Design and Research Institute of Building Materials Industry Co., Ltd., Xi’an, China *Corresponding Author

Abstract

In the process of urbanization in China, the high energy consumption of building wall materials has restricted the development of building energy conservation. Phase change materials (PCM) with phase change latent heat characteristics provide a way to improve the energy-saving performance of walls. This study focuses on the influence of phase change aggregates on the performance of self-insulating wall materials and explores the optimal dosage. The experiment uses water, cement, sand, and ceramsite as the base materials, and solid/liquid paraffin is used to prepare phase change aggregates. The dosage is adjusted to prepare cement-based specimens. After 7 days and 28 days of natural curing, the thermal conductivity, compressive and flexural strength are tested. The results show that the apparent density and water absorption rate affect the thermal conductivity through the coupling of pores and water conduction; the reduction of cement paste (thermal conductivity 1.2~1.5 W/(m·K)) will affect the thermal conductivity and weaken the mechanical properties. When the content of phase change aggregates: cement: water is 1.5:1:0.4, the comprehensive performance is the best: the thermal conductivity is 0.078 W/(m·K) (meeting the standard), the compressive strength is 19.93 MPa (meeting the non-load-bearing requirements), and the water absorption rate is 8.98% (which can be optimized by curing).

Keywords

Self-insulating Wall Materials; Phase Change Aggregates; Thermal Properties; Mechanical Properties

References

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