Assessing the direct interaction of asphalt binder with stearic acid/palmitic acid binary eutectic phase change material

被引：30

作者：

Dai, Jiasheng ^{[1
]}

Ma, Feng ^{[1
,2
]}

Fu, Zhen ^{[3
]}

Li, Chen ^{[1
]}

Wu, Di ^{[1
]}

Shi, Ke ^{[3
]}

Dong, Wenhao ^{[1
]}

Wen, Yalu ^{[1
]}

Jia, Meng ^{[1
]}

机构：

[1] Changan Univ, Key Lab Special Area Highway Engn, Minist Educ, Xian 710064, Shaanxi, Peoples R China

[2] Xinjiang Agr Univ, Sch Traff & Logist Engn, Urumqi 830052, Peoples R China

[3] Changan Univ, Sch Mat Sci & Engn, Xian 710064, Shaanxi, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 320卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

Phase change materials; Binary eutectic; Thermal regulating property; Rheological properties; Heat island effect; THERMAL-ENERGY; FATTY-ACIDS; RHEOLOGICAL PROPERTIES; PERFORMANCE; STORAGE; PAVEMENT; FEASIBILITY; MIXTURE;

D O I：

10.1016/j.conbuildmat.2021.126251

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

To achieve the practical application of the stearic acid/palmitic acid binary eutectic phase change material (SA/ PA-PCM) as an asphalt additive for cooling asphalt pavements in the summer, this study aimed to explore the direct interaction of asphalt with SA/PA-PCM. A series of tests were implemented to analyze the chemical composition, microstructure, thermophysical and rheological behaviors and thermal regulating properties of the SA/PA-PCM-modified binders. The results showed that a binder with a higher content of crystalline SA/PA-PCM corresponded to greater elastic modulus, complex modulus, elastic recovery potential, and creep behaviors, suggesting a positive role for SA/PA-PCM in the high-temperature rutting resistance and low-temperature cracking resistance of asphalt. These results are ascribable to the fact that incorporating SA/PA-PCM reconstructed the chemical composition of asphalt and formed a stable layered structure system inside the binder. However, the liquefied SA/PA-PCM destroyed the internal layered structure in the modified binders, resulting in a double loss of elasticity and viscosity. Furthermore, SA/PA-PCM improved the specific heat capacity of the binder by approximately 20%. The distinguished temperature regulating property was reflected by the obvious temperature difference (max 11.5 degrees C) and temperature hysteresis (approximately 40 min) between the modified binder and the base binder.

引用

页数：14

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