Extension of CBR Method to Highway Pavements
Publication: Journal of Transportation Engineering
Volume 111, Issue 5
Abstract
The CBR design method for flexible airfield pavements was modified in 1971, on the basis of full‐scale tests. A new load repetition factor and Equivalent Single Wheel Load computation scheme were introduced and implemented in the modified CBR design method. In the present paper, the method is extended to flexible highway pavements. The effect of loading conditions (which are different in highway and airfield pavements), is verified using AASHO Road Test results. The load repetition factor is then adjusted for the heavy traffic range. Pavement thicknesses obtained with the extended CBR design method are compared with those obtained with the current CBR method for highways, AASHO Road Test, SHELL and the British Road Note 29. It is found that the extended CBR design method leads to: (1) A substantial reduction of pavement thickness as compared to the current CBR method; (2) a slightly thicker pavement in the light and medium traffic range and a slightly thinner pavement for heavy traffic as compared to other design methods. Design curves are presented for different subgrade CBR values.
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References
1.
AASHO Road Test: “The AASHO Road Test: Report 5—Pavement Research,” Special Report 61E, Highway Research Board, 1962, p. 352.
2.
Asphalt Institute, “Thickness Design—Asphalt Pavements for Highways and Streets,” Manual Series No. 1, Revised 8th Ed., College Park, Md., 1981.
3.
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4.
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5.
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6.
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8.
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9.
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10.
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11.
Wiseman, G., and Zeitlen, J. G., “A Comparison between CBR and the Shear Strength Methods in the Design of Flexible Pavements,” Proceedings, Fifth ICSMFE, 1961, pp. 359–366.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 111 • Issue 5 • September 1985
Pages: 561 - 569
Copyright
Copyright © 1985 ASCE.
History
Published online: Sep 1, 1985
Published in print: Sep 1985
Authors
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