|Table of Contents|

Influence of aggregate physicochemical properties on interfacial adhesion performance of asphalt-aggregate(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年3期
Page:
52-61
Research Field:
道路工程(道路交通功能材料专刊)
Publishing date:

Info

Title:
Influence of aggregate physicochemical properties on interfacial adhesion performance of asphalt-aggregate
Author(s):
WANG Hai-nian1;  XU Hui1;  WANG Jiang-feng1;  YING Jun-zhi2;  SHEN Si-li2;  ZHANG Chen3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Hangzhou Metropolitan Expressway Co., Ltd., Hangzhou 310008, Zhejiang, China; 3.School of Energy and Architecture,Xi'an Aeronautical University, Xi'an 710077, Shaanxi, China )
Keywords:
road engineering;  adhesion;  surface energy;  molecular dynamics;  water stability
PACS:
U416
DOI:
10.19721/j.cnki.1671-8879.2022.03.005
Abstract:
In order to investigate the influence of physical and chemical characteristic of the aggregates on the adhesion performance of the asphalt-aggregate interface. Limestone, basalt, sandstone and granite were adopted as the research objects. The surface energy parameters of aggregate and asphalt were measured by lying drop method. And the interface failure model of aggregate and asphalt under anhydrous and water conditions based on the surface energy parameters were established. The adhesion index(ER)was proposed to quantitatively evaluate the failure mechanism of asphalt-aggregate interface. Furthermore, based on the molecular dynamics(MD)simulation, the interfacial models of aggregate oxide, asphalt and water were established. The relative molecular weight of aggregate oxides(OR)was proposed to characterize the adhesion performance between oxide and asphalt, and its correlation with ER was verified. Four types of aggregates were used to form asphalt mixture specimens, and the water immersion Marshall test, freeze-thaw splitting test and water immersion rutting test were carried out to verify the correlation between ER and OR and moisture stability evaluation indicators. The results show that the surface energy of aggregate is opposite to the bond strength of asphalt-aggregate. The difference between the work of adhesion of asphalt-aggregate and the work of cohesion of asphalt is the work of wetting. Asphalt is more resistant to its own deformation due to the electrostatic attraction in the presence of water. Furthermore, the reduction of the work of wetting affects its adhesion to aggregates. The adhesion work between asphalt and aggregate is transformed into negative debonding work due to the presence of water. The smaller the absolute value of debonding work, the better the adhesion performance between asphalt and aggregate. The proposed ER is directly proportional to the wetting work and inversely proportional to the debonding work of the asphalt-aggregate interface. It can be used to evaluate the adhesion performance of asphalt and aggregate more comprehensively from the perspective of surface energy theory. Furthermore, the law of asphalt-aggregate bonding performance is verified by MD simulation. ER and OR are positively correlated, and the determination coefficients between the two and the moisture stability evaluation index of asphalt mixture have reached above 0.8, which can effectively characterize the adhesion of different aggregates and asphalt, and judge its influence on the moisture damage resistance of asphalt mixtures.12 tabs, 6 figs, 24 refs.

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Last Update: 2022-07-01