Interface shear stiffness test and correction for cement concrete pavement with cement stabilized crushed stone base(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年05期
- Page:
- 22-28
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Interface shear stiffness test and correction for cement concrete pavement with cement stabilized crushed stone base
- Author(s):
- ZHANG Yan-cong; GAO Ling-ling
- 1. School of Highway, Chang’an University, Xi’an, Shaanxi; 2. Key Laboratory of Highway Construction & Maintenance Technology in Loess Region of Ministry of Transport, Shanxi Transportation Research Insitute, Taiyuan, Shanxi; 3. Key Laboratory of Road Structure and Material of Ministry of Transport, Changsha University of Science & Technology, Changsha, Hunan; 4. Department of Road and Bridge Engineering, Shanxi Conservancy Technical Institute, Yuncheng, Shanxi
- Keywords:
- road engineering; cement concrete pavement; interface equivalent shear stiffness; bond stressslip curve; interface treatment measure
- PACS:
- U416.2
- DOI:
- -
- Abstract:
- In order to accurately characterize the interface contact parameter between cement concrete slabs and base, the horizontal shear tester was invented which can simulate the vertical stress. The bond stress-slip curve of cement stabilized crushed stone base concrete pavement specimen in which the interface treated with emulsified asphalt, geotextile and asphalt concrete interlayer was determined in two stages. Then the relationship model between average shear stiffness and vertical compressive stress was established by regression analysis. The size of the interface shear area under the equivalent of a single round load was determined by trial algorithm. Compress stress correction was made for average shear stiffness based on simple iterative method. Equivalent shear stiffness of the three interlayer disposal measures was recommended. The results show that in the first stage of shear test, specimen interface treated with emulsified asphalt requires the maximum shear stress, geotextiles requires little and asphalt concrete is minimum. The interface contact state between slab and base is significantly related to the interface treatment measures, and it has a significant effect on the structural behavior of pavement. So, the interface treatment measure selection needs to find a balance between flexural stress and thermal stress of slab. Compared with the test results of stage one, in the second stage, shear capacity of the three kinds of specimens are significantly weakened and the average shear stiffness decline dramatically. The difference between interface shear stiffness of pavement structure is tremendous in different using stages, so the interface shear parameter selection must adopt the using state of pavement in structural analysis.
Last Update: 2016-10-04