Study on the multiscale adhesive properties between asphalt and aggregate
Study on the multiscale adhesive properties between asphalt and aggregate
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沥青与骨料多尺度粘结性能研究
DOI：
10.1016/j.conbuildmat.2020.118693
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发表时间：
2020-07-20
影响因子：
7.4
通讯作者：
Chen, Bo
中科院分区：
文献类型：
--
作者：
Ji, Xiaoping;Sun, Enyong;Chen, Bo
骨料与沥青的粘结性是影响沥青混合料路用性能的重要因素。这主要归因于接触界面之间的微观作用力，包括界面之间的物理和化学相互作用，这分别取决于材料的表面微观形貌（SMM）和化学成分。本研究分别利用共聚焦显微镜和原子力显微镜（AFM）对骨料和沥青的SMM参数和表面能进行了研究。通过拉脱试验测试了集料与沥青的宏观粘接强度，研究了材料的smm和表面能对宏观粘接强度的影响。最后，探讨了集料与沥青的多尺度黏附机理。结果表明，骨料与沥青粘结剂之间的粘结主要是由以沥青表面能为主的化学相互作用引起的。物理相互作用与沥青和集料的smm有关。骨料SMM的粗糙度有利于提高附着力，而沥青SMM的粗糙度则不利于提高附着力。在沥青的四个组分中，沥青质和树脂对沥青的表面能有显著的影响，其表面能随树脂含量的增加而增加，反之随沥青质含量的增加而降低。团聚体表面能主要受SiO2和CaO含量的影响，随SiO2含量的增加而减小，随CaO含量的增加而增大。(C) 2020 Elsevier Ltd.版权所有。
Adhesion between aggregate and asphalt is an important factor affecting the road performance of the asphalt mixture. It can be mainly attributed to the microscopic forces between the contacting interfaces, including the physical and chemical interactions between interfaces, which are subject to the surface micromorphology (SMM) and chemical composition of the materials, respectively. In this study, the SMM parameters and surface energies of the aggregate and asphalt were investigated using confocal microscopy and atomic force microscopy (AFM), respectively. The macroscopic adhesion strength between aggregate and asphalt was tested via pull-off tests, and the influences of the SMMs and surface energies of the materials on the macroscopic adhesion strength were investigated. Finally, the multiscale adhesion mechanisms between aggregate and asphalt were explored. Results indicated that adhesion between aggregate and asphalt binder was mainly attributed to the chemical interaction that was dominated by asphalt surface energy. The physical interaction was related to the SMMs of asphalt and aggregate. The roughness of the aggregate SMM was beneficial for improving the adhesion, whereas the roughness of the asphalt SMM was unfavorable. Among the four fractions of asphalt, the asphaltenes and resins had a significant influence on the surface energy of asphalt, which increased with an increase in the resin content, and conversely decreased with an increase in the asphaltenes content. The aggregate surface energy was mainly affected by the SiO2 and CaO content, and decreased with an increase in the SiO2 content, and increased with an increase in the CaO content. (C) 2020 Elsevier Ltd. All rights reserved.