Selection of Strength Standard of CTB in High-Class Highways

Abstract:

A reasonable design strength standard is of great practical significance for reducing pavement diseases. First, the bottom layer tensile stress of the typical pavement structure in the operating period is calculated using computer program BISAR while the overload、the interface link status and construction variability are all considered. And then the bottom layer tensile stresses of the upper and lower base are checked under truck load during construction. According to the relationship between cleavage strength (90d) and unconfined compressive strength (7d), it is deemed that the appropriate design strength standard should be 2.1MPa~3.5MPa. Finally, combined with the results of the unconfined compressive strength of core samples in the field it is proved that the current design standard is a little high.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 4261-4264
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.4261
• Online since: May 2011
• Authors: Yin Fei Du, Xin Yu
• Keywords: BISAR, Cleavage Strength, CTB, Highway Engineering, Unconfined Compressive Strength (UCS)

References

[1] JTJ034-2000. Technical Specifications for Construction of Highway Road-bases[S].Beijing: China Communication Press. (In Chinese)

[2] JTGD50-2004.Code for Design of Highway Asphalt Pavement[S]. Beijing: China Communication Press. (In Chinese)

[3] LI Shu-ming and XU Zhi-hong in: Minimum Splitting and Compressive Strength of Cement-Treated Aggregate, edited by JOURNAL OF BUILDING MATERIAL.2007, 10(2):177-182. (In Chinese)

[4] LI Ming-jie in: STUDY ON VIBRATING TEST METHODS FOR CEMENT STABILIZATION OF CRUSHEN [D].Xi'an: Chang'an University, 2010. (In Chinese)

[5] Gao Guo-hua in: The Study on the Mechanical Properties of Interface between Semi-grid Base and Asphalt Pavement [D]. Chongqing: Chongqing Jiao tong University, 2008. (In Chinese)

[6] Zhu Jian-hua and He De-zhong in: Mechanical Analysis of interface of semi-rigid asphalt pavement under different combinations, edited by Journal of China & Foreign Highway.2008, 28(3):59-61. (In Chinese)

[7] Sha Qing-lin.Asphalt Pavement on Semi-rigid Base for High-class Highways. Beijing: China Communication Press (2008). (In Chinese)

[8] Sha Qing-lin. Premature Damage and Its Preservative Measures of Bituminous Pavement on Expressway. Beijing: China Communication Press (2008). (In Chinese)