Geotechnical and Geological Engineering

, Volume 37, Issue 1, pp 217–234 | Cite as

Correlation of California Bearing Ratio (CBR) Value with Soil Properties of Road Subgrade Soil

  • Valentine Yato KatteEmail author
  • Souleyman Moupe Mfoyet
  • Bertille Manefouet
  • Armand Sylvain Ludovic Wouatong
  • Lawrence Aleh Bezeng
Original Paper


The California Bearing Ratio (CBR) is the most utilised parameter for dimensioning flexible pavements in tropical countries. Often this test is expensive, laborious and time consuming, and to overcome this, some regression analysis (single and multiple) was considered between the soil’s index properties (liquid limit-LL, Plastic limit-PL and Plasticity index-PI), compaction characteristics (maximum dry density-MDD and optimum moisture content-OMC), percentage of particle sizes (gravel, sand and clay/silt) and CBR. The study was carried out along an ongoing roadway construction project where thirty-three soil samples were collected and transported to the laboratory for analysis. Routine geotechnical tests were carried out and thereafter correlation and regression analysis were run on the obtained results to assess the relationship between these index properties, compaction characteristics and the experimental CBR obtained. The results of this analysis showed relatively fair coefficients of determination of R2 = 0.772 between CBR and MDD using single linear regression analysis and R2 = 0.841 between CBR and all the parameters using multiple linear regression analysis (MLRA). Though the MLRA improved the R2 from 0.772 to 0.841, the inclusion of additional properties results in a marginal increase of R2 indicative of weak correlators of CBR hence practically not cost effective for pavement design .


CBR Flexible pavement Soil index properties Compaction characteristics Percentage of particle sizes SLRA MLRA Pearson’s coefficient R2 Cost effective 


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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Civil Engineering and Forestry Techniques, HTTTCThe University of BamendaBambiliCameroon
  2. 2.Department of Earth Sciences, Faculty of ScienceUniversity of DschangDschangCameroon
  3. 3.Bela Company LTD.BamendaCameroon

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