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山东大学学报 (工学版) ›› 2019, Vol. 49 ›› Issue (3): 57-62.doi: 10.6040/j.issn.1672-3961.0.2017.436

• 土木工程 • 上一篇    下一篇

ATB柔性基层与半刚性基层的层间抗剪规律

赵之仲(),柳泓哲*(),刘桂强,杨振宇   

  1. 山东交通学院交通土建工程学院, 山东 济南 250357
  • 收稿日期:2017-09-04 出版日期:2019-06-20 发布日期:2019-06-27
  • 通讯作者: 柳泓哲 E-mail:86994896@qq.com;767226439@qq.com
  • 作者简介:赵之仲(1978—),男,山东武城人,博士,副教授,主要研究方向为公路路基路面材料与结构. E-mail: 86994896@qq.com
  • 基金资助:
    2013年度山东省高等学校科技计划资助项目(J13LG12);2016年度山东省交通运输科技计划资助项目(2016B07)

The interlaminar shear rule between flexible base and semi-rigid base

Zhizhong ZHAO(),Hongzhe LIU*(),Guiqiang LIU,Zhenyu YANG   

  1. College of Civil Engineering, Shandong Jiaotong University, Jinan 250357, Shandong, China
  • Received:2017-09-04 Online:2019-06-20 Published:2019-06-27
  • Contact: Hongzhe LIU E-mail:86994896@qq.com;767226439@qq.com
  • Supported by:
    2013年度山东省高等学校科技计划资助项目(J13LG12);2016年度山东省交通运输科技计划资助项目(2016B07)

摘要:

以ATB-25沥青混合料与水泥稳定碎石成型复合试件,控制复合试件层间沥青和碎石用量,采用自主研发的剪切仪进行抗剪强度试验,分析影响层间抗剪强度的因素及变化规律。通过设置试验温度、碎石和沥青用量等参数,制定不同的试验方案进行试验。试验结果表明:对层间抗剪强度影响最大的因素是温度,从5 ℃上升到35 ℃时最大剪应力从1.36 MPa下降到0.16 MPa,其次是沥青用量;碎石用量影响最小,而且不同温度下沥青和碎石的最佳用量也不同。在实际工程中,在考虑沥青和碎石的用量时,应考虑工程所在的地区,高温地区沥青的用量应比低温地区稍低一些,同时严格控制碎石用量,提高层间联结质量,明确层间抗剪强度与层间联接各因素的规律。

关键词: 复合试件, 剪切仪, 抗剪强度, 沥青封层, 碎石封层, 层间联结

Abstract:

ATB-25 asphalt mixture and cement stabilized macadam were taken to shape composite specimen, the amount of asphalt and chip in the composite specimen layer was controlled. The develop shear apparatus was used to carry out shear strength test, the influence factors and change rules of interlaminar shear strength were analyzed based on the test results. Different test schemes were worked out by setting up the test temperature and the amount of chip and asphalt. The test results showed that the temperature was the most influencing factor on the shear strength of the layer, when the test temperature increased from 5 ℃ to 35 ℃, the maximum shear stress decreased from 1.36 MPa to 0.16 MPa. The second influencing factor was the amount of asphalt, the aggregate content had the least influence, and the optimum asphalt content was different due to the different temperature. Therefore, in practical engineering, the amount of asphalt and gravel should be considered in combination with the location. The asphalt content in high temperature area should be slightly less than in the low temperature area. The aggregate content should be strictly controlled to improve the quality of interlayer connection and define the laws of interlaminar shear strength and connection.

Key words: composite specimen, shear apparatus, shear strength, asphalt seal, chip seal, interlayer connection

中图分类号: 

  • U416.217

图1

复合试件示意图"

图2

剪切仪示意图"

表1

四因素三水平试验设计"

试验号温度/℃沥青用量/
(kg·m-2)
碎石用量/
(kg·m-2)
150.74
250.96
351.18
4200.98
5201.14
6200.76
7351.16
8350.78
9350.94

图3

试件装配完毕放入MTS试验机上"

图4

第一阶段剪应力随剪切位移的变化"

图5

第二阶段剪应力随剪切位移的变化"

图6

第三阶段剪应力随剪切位移的变化"

表2

结构的抗剪能力及各指标取值"

温度/℃沥青封层用量
/(kg·m-2)
碎石封层用量
/(kg·m-2)
ATB-25+水稳碎石结构
τmax/MPaσa/MPaSp/mmτs/MPaμ
0.74
50.961.360.281.09
1.18
0.98
201.140.460.091.970.372.76
0.76
1.16
350.780.160.080.08
0.94
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