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- W2916895385 abstract "The Californian Bearing Ratio (CBR) is one of the most important geotechnical parameter used for designing pavement layers in road construction. However, the test for determining CBR requires a large quantity of laterites, enough time and energy. This study proposes a method for assessing the CBR values of laterites based on index parameters using univariate and bivariate statistical analyses. The results obtained show that the volcanic rock-derived laterites are slightly more fines (<75 µm = 26.8%), more plastics (Plasticity Index PI = 29%) and have a low bearing capacity (CBR = 38%) than sedimentary rock-derived laterites (<75 µm = 26.3%, PI = 27%, CBR = 40%). The Principal Component Analysis reveals 03 groups of geotechnical parameters, (1) fines, clays, skeleton, mortar, sand and specific gravity (γs) parameters, (2) Plasticity Product (Pp), PI, Potential Swelling (εs), Liquid Limit (LL), Plasticity Limit (PL) and Optimum Moisture Content (OMC) parameters, and (3) CBR, Grading Modulus (Gm), gravel and Activity Ratio (Ac) parameters. The Hierarchical Classification in Principal Components confirms the existence of 02 families of laterites and shows that sedimentary rock-derived laterites are characterized by Maximum Dry Density (MDD), sand and Gm parameters, and volcanic rock-derived laterites by εs, PI, LL, Pm, Pp, PL, <425 μm, OMC, <2 mm, <75 µm, and <2 µm parameters. The prediction of CBR values based on those of 04 physical geotechnical parameters is excellent (R2 = 0.95). The adjustment equation is: CBR = -0.0616 (< 75 µm) + 0.0892PI - 0.1035OMC + 0.9347MDD + β. Also, under similar bioclimatic conditions, sedimentary rock-derived laterites are more suitable for road construction than volcanic rock-derived laterites." @default.
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- W2916895385 date "2019-06-01" @default.
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- W2916895385 title "Assessment of the determination of Californian Bearing Ratio of laterites with contrasted geotechnical properties from simple physical parameters" @default.
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- W2916895385 doi "https://doi.org/10.1016/j.trgeo.2019.02.001" @default.
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