California bearing ratio (CBR) Affect Analyzing soil properties values and that affects the thickness of the rigid pavement layer in the Egyptian context

Document Type : Original Article

Author

civil dept. Elminya H.I.E.T

Abstract

: In the realm of street building engineering, the California Bearing Ratio



Article history:

Received

Received in revised form 0

Accepted 00

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Keywords:

California Bearing Ratio sub-grade reaction Plasticity index

Rigid pavement Experimental



(CBR) is an essential criterion for determining the size of stiff pavements in tropical locations. The ability to compute the modulus of subgrade soil layers using installed correlations is critical when developing both flexible and stiff road layouts. The Atterberg limits, maximum dry density (MDD), and optimal moisture content (OMC) of the soil all have a significant impact on CBR values. Using one hundred soil samples gathered from different

Both single and multiple linear regression models were used to examine the relationship between CBR values and soil index properties. CBR and MDD were found to be directly related, with a coefficient of willpower (R2) of 0.96. With an R2 of 0.87, a comparable association between CBR and OMC% was found. Nonetheless, there was a weaker negative correlation between CBR values and the plasticity index (PI). Additionally, the data analysis revealed that, although soil types A-2-4 and A-2-6 showed considerable differences, soil types A-1-a, A-1-b, and A-3 showed only slight differences between laboratory-derived and projected CBR values.

Conclusions: The findings demonstrate the possibility of cutting down on the time and effort required for CBR estimation.

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The Egyptian International Journal of Engineering Sciences and Technology
Volume 51, Issue 1
September 2025
Pages 45-52

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