Materials Reports 2021, Vol. 35 Issue (z2): 138-144 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
|
|
|
|
|
Adhesion of Foamed Asphalt-Aggregate Interface Based on Molecular Dynamics |
YANG Jian, GUO Naisheng, GUO Xiaoyang, WANG Zhichen, FANG Chenze, CHU Zhaoyang
|
College of Transportation Engineering, Dalian Maritime University, Dalian 116026, China |
|
|
Abstract To reveal the micro-scale interfacial adhesion properties of foamed asphalt and aggregate, based on molecular dynamics (MD) simulation method, the 4-component 12-molecule asphalt molecular model was employed and water molecules was added into it to simulate foamed asphalt, then the influence of the water content and temperature on the foamed asphalt cohesion was analyzed, also, the effect of water content, aggregate type, aggregate surface humidity and the diffusion of water molecules on the foamed asphalt-aggregate interface adhesion was investigated in this study. The effects of water content, temperature and simulation duration on the diffusion of water molecules in foamed asphalt were analyzed by statistical method. The results showed that the addition of water can increase the distance among asphalt macromolecules, weaken the intermolecular force of asphalt and reduce the viscosity of foamed asphalt. Moreover, the introduction of water can increase the glass transition temperature of the foamed asphalt. When the moisture content (<1%) of the foamed asphalt was relatively low, the foamed asphalt-aggregate interface adhesion was enhanced, additionally, when it was relatively high (>1.6%), the water can overflow from the foamed asphalt and combine with the aggregate, so as to reduce the interface adhesion of foamed asphalt-aggregate. Under the wet condition of the aggregate surface, the interface adhesion between the alkaline aggregate and the foamed asphalt was better than that between the acidic aggregate and the foamed asphalt. Also, with the increase of the moisture content of the foamed asphalt, the interface adhesion cannot be weakened, but it can be enhanced to a certain extent. The moisture content showed no significant effect on the diffusion of water molecules, while the temperature and simulation duration performed an important effect on it. As simulation duration increased, the diffusion of water molecules gradually weakened and finally reached a dynamic equilibrium. The higher the temperature, the faster the diffusion of moisture in the foamed asphalt, which can cause an adverse effect on the foamed asphalt-aggregate interface adhesion.
|
Published: 09 December 2021
|
|
Fund:This work was financially supported by the National Natural Science Foundation of China (51308084), the Fundamental Research Funds for the Central Universities (3132017029), the “Double Tops” Construction Special Project of Dalian Maritime University(BSCXXM021), the Science Fundation of Dalian,China(2020JJ26SN062). |
About author:: Jian Yang is currently pursuing his master degree at the college of Transportation Engineering, Dalian Maritime University(DMU), under the supervision of Prof. Guo Naisheng. His research has focued on the micro-interaction mechanism between foamed asphalt and aggregate. Naisheng Guo, professor, supervisor of doctor, Ph. D., postdoctor. He is currently a full professor in College of Transportation Engineering, Dalian Maritime University. His research has focused on bitumen and bituminous mixture. In recent years,more than 90 academic papers have been published in domestic and foreign academic journals, among which more than 50 have been retrieved by SCI and EI. |
|
|
1 韦武举,郑炳锋,韩超,等. 公路, 2017, 62(02), 200. 2 Liu S, Zhou S, Peng A. Journal of Cleaner Production. 2020, 277, 123334. 3 Bairgi B K, Tarefder R A. International Journal of Pavement Research and Technology, 2021, 14(1), 13. 4 Li D D, Greenfield M L. Fuel, 2014, 115, 347. 5 Sun W, Wang H. Applied Surface Science, 2020, 510, 145435. 6 Guo F, Zhang J, Pei J, et al. Construction and Building Materials, 2020, 252, 118956. 7 Guo F, Zhang J, Pei J, et al. Journal of Molecular Modeling, 2019, 25(12), 365. 8 Xu G, Wang H. Fuel, 2017, 188. 9 Liu J, Yu B, Hong Q. Construction and Building Materials, 2020, 255, 119332. 10 He L, Li G, Lv S, et al. Construction and Building Materials. 2020, 254, 119225. 11 Du Z, Zhu X. Transportation Research Record: Journal of the Transportation Research Board, 2019, 2673(4), 500. 12 陈桥,虞浩,陈东风,等. 河南科学, 2018, 36(3), 349. 13 崔亚楠,李雪杉,张淑艳. 建筑材料学报, 2021, 24(5), 1105. 14 韦万峰. 温拌泡沫沥青发泡特性及混合料路用性能研究. 硕士学位论文,重庆交通大学, 2018. 15 李根泽. 基于分子模拟技术的路用沥青感温性研究. 硕士学位论文, 吉林大学, 2019. 16 刘圣洁,谢政专,彭爱红. 深圳大学学报(理工版), 2021, 38(2), 163. 17 Liu S, Zhou S, Peng A. Journal of Cleaner Production, 2020, 277, 123334. 18 郭猛. 沥青与矿料界面作用机理及多尺度评价方法研究. 博士学位论文, 哈尔滨工业大学, 2016. 19 Xu G, Wang H. Computational Materials Science, 2016, 112, 161. 20 王鹏. 沥青与集料界面的粘附性能研究. 硕士学位论文, 华南理工大学, 2017. 21 Khan A, Redelius P, Kringos N. Construction and Building Materials, 2016, 125, 1005. 22 Cala A, Caro S, Lleras M, et al. Construction and Building Materials, 2019, 216, 661. 23 邓乃铭. 基于泡沫沥青温拌再生沥青混合料基体的半柔性路面路用性能研究. 硕士学位论文,广州大学, 2020. 24 魏建明. 沥青、集料的表面自由能及水分在沥青中的扩散研究. 博士学位论文, 中国石油大学, 2008. 25 Dos Santos S, Partl M N, Poulikakos L D. Construction and Building Materials, 2014, 71, 618. 26 Hou Y, Wang L, Wang D, et al. Applied Sciences-Basel, DOI:10.3390/app7080770. |
|
|
|