Preparation, microstructure, performance and mortar application of paraffin/titanium-bearing blast furnace slag phase change aggregate

Jun Jiang; Luo Lei; Chao Jin; Tie Liu; Jinqiao Huang; Yanping Wu; Shuzhen Lv; Zhongyuan Lu; Li Zheng; Jun Li

Case Studies in Construction Materials (Dec 2023)

Preparation, microstructure, performance and mortar application of paraffin/titanium-bearing blast furnace slag phase change aggregate

Jun Jiang,
Luo Lei,
Chao Jin,
Tie Liu,
Jinqiao Huang,
Yanping Wu,
Shuzhen Lv,
Zhongyuan Lu,
Li Zheng,
Jun Li

Affiliations

Jun Jiang: State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
Luo Lei: State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China; School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China; Corresponding author at: State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China.
Chao Jin: Ningbo Jiangong Engineering Group Co., Ltd., Ningbo 315040, China
Tie Liu: Ningbo Jiangong Engineering Group Co., Ltd., Ningbo 315040, China
Jinqiao Huang: Ningbo Jiangong Engineering Group Co., Ltd., Ningbo 315040, China
Yanping Wu: Ningbo Jiangong Engineering Group Co., Ltd., Ningbo 315040, China
Shuzhen Lv: School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China
Zhongyuan Lu: State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
Li Zheng: Concrete Technology Unit, School of Science and Engineering, University of Dundee, Scotland DD1 4HN, UK
Jun Li: State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China

Journal volume & issue: Vol. 19
p. e02262

Abstract

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The application of phase change materials (PCM) in building energy saving is limited by the cost and performance of PCM carriers. Using solid waste as a PCM carrier can reduce cost and environmental impacts. In this study, lightweight and porous titanium-bearing blast furnace slag (Ti-BFS) was innovatively used as PCM carrier to prepare paraffin/Ti-BFS phase change aggregate (PTA) by vacuum impregnation, and then PTA was used to develop thermal energy storage cement mortar by replacing sand. The microstructure and performance of aggregate and mortar were also investigated. The results indicated that PTA has a paraffin loading rate of 21.9%, latent heat of 65.7 J/g for melting and 65.0 J/g for freezing, and good chemical compatibility. The microstructure reveals that PTA has good compatibility with cement matrix. Compared with ordinary cement mortar, a reduction percentage of 28-day compressive strength, dry density and thermal conductivity at 100% PTA substitution rate are respectively 39.8%, 29.1% and 52.5%. However, a significant capacity to weaken temperature fluctuation was observed.

Published in Case Studies in Construction Materials

ISSN: 2214-5095 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/case-studies-in-construction-materials

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