Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (3): 57-62.doi: 10.6040/j.issn.1672-3961.0.2017.436

• Civil Engineering • Previous Articles     Next Articles

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)

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

CLC Number: 

  • U416.217

Fig.1

The schematic diagram of composite specimen"

Fig.2

The schematic diagram of shear apparatus"

Table 1

Four-factor and tri-level experimental design"

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

Fig.3

The test piece was assembled and installed inthe MTS test machine"

Fig.4

Shear stress changing curve with the shear displacement in the first stage"

Fig.5

Shear stress changing curves with the shear displacement in the second stage"

Fig.6

Shear stress changing curves with the shear displacement in the third stage"

Table 2

The shear resistance of structure and the values of various indexes"

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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