|Table of Contents|

Interlayer pollution characteristics of asphalt pavement based on compression-direct shear test method(PDF)

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

Issue:
2023年5期
Page:
21-29
Research Field:
道路工程
Publishing date:

Info

Title:
Interlayer pollution characteristics of asphalt pavement based on compression-direct shear test method
Author(s):
AI Chang-fa1; 2;  LIU Yi-ming1; 2;  REN Dong-ya1; 2
(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Sichuan Provincial Key Laboratory of Road Engineering, Chengdu 610031, Sichuan, China)
Keywords:
road engineering;  interlayer contamination;  composite Marshall specimen;  bonding performance;  pressure-direct shear test;  compressive stress;  shear strength
PACS:
U416.217
DOI:
10.19721/j.cnki.1671-8879.2023.05.003
Abstract:
The interlayer strength characteristics of pavement layers under pollution conditions were investigated by conducting pressure-direct shear tests on composite Marshall specimens, and the direct shear test fixture had been improved into a pressure-direct shear device based on existing equipment. Three types of pollution(soil pollution, water pollution, and oil pollution)were used to simulate interlayer environmental conditions, with different levels of pollution, soil pollution(0, 0.3, 0.6, 0.9 kg/m2), water pollution(0, 0.3, 0.6, 0.9 kg/m2), and oil pollution(0, 0.3, 0.6, 0.9 kg/m2). Additionally, different horizontal stress conditions were applied(0, 0.1, 0.3, 0.5 MPa)during the pressure-direct shear tests, the impact of these factors on the interlayer shear strength of the composite Marshall specimens were studied. The results show that under both pure direct shear and pressure-direct shear, all three types of pollution weaken the interlayer bonding performance to varying degrees. Under the same soil pollution level, shear strength increases with an increase in horizontal stress. As the soil pollution level increases under the same horizontal stress, the reduction in shear strength gradually decreases, and at 0.5 MPa of pressure, the coverage area of the interface soil pollution increases, but it has almost no effect on the interlayer shear strength. Under pure direct shear, water pollution significantly influences the shear strength, with a maximum variation of 0.2 MPa, while under pressure-direct shear, it does not exceed 0.1 MPa. Increasing the amount of oil pollution under the same horizontal stress results in shear strength reductions of 79.24%, 80% and 79.4%, respectively. At an oil pollution level of 0.9 kg/m2, an increase in horizontal stress can no longer restrain the weakening effect of oil pollution on the interlayer shear strength. By establishing fitting models for the three types of pollution and pollution levels with shear strength under both no stress and with stress conditions, the analysis reveals the following order of influence on interlayer strength, oil pollution, soil pollution, water pollution. When compared to pure direct shear, pressure-direct shear shows no significant effects of different gradients of water pollution and soil pollution on interlayer shear strength. However, under the influence of oil pollution, pressure-direct shear exhibits a notable reduction in interlayer shear strength.2 tabs, 12 figs, 25 refs.

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Last Update: 2023-10-10