低温下水泥路面调温相变材料的制备及性能

doi:10.11896/cldb.20050159

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Abstract To prepare and select temperature-adjusting phase change materials for cement pavement under low temperature, expanded graphite was used as the carrier for phase change materials, the phase change properties of octanoic acid-decanoic acid and tetradecane were studied. In this study, the optimum eutectic mass ratio of octanoic acid-decanoic acid was determined by step-cooling curve experiments and the lowest eutectic mixture phase change temperature theory. The phase change process and chemical property of the two phase change materials were investigated by differential scanning calorimetric (DSC)analysis experiments, fourier transform infrared spectrometer(FT-IR)experiments and thermogravimetric analysis (TGA)experiments. The results show that: The low temperature phase change range of octanoic acid-decanoic acid and tetradecane is about -1.8—2.5 ℃, and their phase change performance is less affected by heat release from cement hydration.Octanoic acid-decanoic acid and tetradecane meet the requirements of low temperature phase change materials. However, tetradecane has a higher enthalpy of phase change, so it is recommended as a phase change material to regulate temperature for cement pavements at low temperatures; after multiple phase change cycles, there is no chemical change in octanoic acid-decanoic acid and tetradecane, their phase change properties are stable. The adsorption of expanded graphite to tetradecane is better, and it is a physical adsorption. After encapsulation,there is little change in phase change performance of tetradecane.

Key words： octanoic acid-decanoic acid tetradecane expanded graphite low temperature phase change performance cement pavement

Published: 03 August 2021

CLC number:

U414

Fund:National Natural Science Foundation of China (51178491).

About author:: Hongzhou Zhu received his Ph.D. degree from Sou-theast University in 2005,and as a visiting scholar at Rutgers State University of New Jersey from 2013 to 2014. He is a professor of Ph.D. tutor at School of Ci-vil Engineering in Chongqing Jiaotong University, and the executive deputy director of National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials. In recent years, some research projectshas been completed, including National Natural Science Foundation projects, Key Special subprojects of the Ministry of Science and Techno-logy, Transportation Construction Science Projects of the Ministry of Transport, industry standard, etc. Some provincial and ministerial prizes have been awarded. He has published more than 90 scientific research papers. His research interests are road engineering structure and materials, including functional pavement, pavement fatigue damage theory, etc.
Ruipu Chen is currently pursuing his Ph.D. degree at School of Civil Engineering in Chongqing Jiaotong University under the supervision of Prof. Hongzhou Zhu. His research focus on road engineering structures and materials.
† These authors contributed equally to this work

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	ZHU Hongzhou
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	GOU Shan
	WANG Daqian
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Cite this article:

ZHU Hongzhou,CHEN Ruipu,GOU Shan, et al. Preparation and Performance of Cement Pavement Temperature-adjusting Phase Change Materials Under Low Temperature[J]. Materials Reports, 2021, 35(14): 14198-14203.

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http://www.mater-rep.com/EN/10.11896/cldb.20050159 OR http://www.mater-rep.com/EN/Y2021/V35/I14/14198

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