Nano-scale analysis of moisture diffusion in asphalt-aggregate interface using molecular simulations

被引：39
|
作者：
Zhou, Xinxing [1 ,2 ]
Moghaddam, Taher Baghaee [3 ]
Chen, Meizhu [2 ]
Wu, Shaopeng [2 ]
Adhikari, Sanjeev [4 ]
Wang, Fusong [2 ,5 ]
Fan, Zepeng [6 ]
机构：
[1] Shanxi Transportat Technol Res & Dev Co Ltd, Key Lab Highway Construct & Maintenance Technol L, Taiyuan 030032, Peoples R China
[2] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
[3] Univ Waterloo, Ctr Pavement & Transportat Technol CPATT, Dept Civil & Environm Engn, Waterloo, ON N2L 3G1, Canada
[4] Kennesaw State Univ, Marietta, GA 30060 USA
[5] Norwegian Univ Sci & Technol, Dept Civil & Environm Engn, Trondheim 7A, N-7465 Trondheim, Norway
[6] Rhein Westfal TH Aachen, Inst Highway Engn, D-52074 Aachen, Germany
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 285卷
基金：
中国国家自然科学基金;
关键词：
Moisture diffusion; Moisture distribution; Asphalt-aggregate interface; Molecular dynamic simulation; Humidity; WATER-VAPOR; DAMAGE; ADHESION; MODEL; RESISTANCE;
D O I：
10.1016/j.conbuildmat.2021.122962
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Presence of moisture can weaken the asphalt-aggregate bond and result in aggregate stripping and moisture damage in asphalt mixture. This study investigates how the moisture affects the asphalt-aggregate bond and simulates moisture distribution of nano-scale in asphalt-aggregate interface. Effects of aggregate type (basalt, dolomite and limestone minerals), humidity and hydraulic pressure on moisture diffusion in asphalt-aggregate interface are studied. Diffusion coefficient (D), radial distribution function (RDF), contact angle (CA), free volume (FV) are calculated through molecular dynamic simulations. Polarizability of moisture in the asphalt-aggregate interface was measured using density function theory (DFT). Nano-scale moisture migration model in the asphalt-aggregate interface is built for the first time. The results show that D depends more on the hydraulic pressure than humidity and aggregate type which represents the significance of hydraulic pressure on the moisture diffusion. In addition, the aggregate type has significant effects on RDF, CA and FV. DFT results indicate that polarizability of moisture changes for different types of aggregate and hydraulic pressure values. In the asphalt-water-aggregate interface, the asphalt competitively interacts with moisture and ions from minerals through intermolecular forces. (C) 2021 Elsevier Ltd. All rights reserved.
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页数：13
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