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Estimation of lateritic soils elastic modulus from CBR index for pavement engineering in Burkina Faso

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Abstract

Pavement design with some soils, such as lateritic soils, is still a “real challenge” in some countries. In the tropical countries guide, recommended for Burkina Faso, the pavement design is performed according to the class of traffic and the soil bearing capacity, characterized by the soaked CBR index (Californian Bearing Ratio). In practice, the validation of pavement structures is possible using numerical models requiring the thickness, the Poisson’s ratio and the elastic modulus of the pavement’s layer materials, as input data for the stresses and the strain calculation. Until now, the guides provide none value of the modulus for the lateritic soils. So, the modulus is estimated by assimilating the lateritic soils to untreated coarse gravels (or GNT: Graves Non Traitées in the French guideline) with known modulus or by using empirical correlations based on the soaked CBR index. This approach lead to an erroneous estimating of modulus of lateritic soils, and to an under or overdesign of pavement structures, due to the fact that the specific correlation suitable for these soils in Burkina Faso is not known. So, this paper was interested in the characterization of lateritic soils from Burkina Faso, according to their CBR bearing capacity, their elastic modulus and to their compaction parameters, after having been assured that the selected soils were representative of country’s road soils. The objective is to perform a specific model for estimating the elastic modulus of these soils. Analysis of the studied parameters showed that CBR and elastic modulus, both depend on moisture content and dry unit weight of soils. A correlation was thus performed between elastic modulus and CBR index. The specific correlation obtained is in power form: E= a.CBRb and relatively close to whose obtained by Green and Hall, where a=66.50 and b=0.526.

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Abbreviations

AASHTO:

American Association of State Highway and Transportation Officials

a, b and c :

Coefficients depending on the nature of soils

AFNOR:

Association Française de Normalisation

CBR:

Californian Bearing Ratio (unsoaked CBR)

CBRs:

Californian Bearing Ratio (soaked CBR)

CEBTP:

Centre Expérimental de recherches et d’études du Bâtiment et des Travaux Publics

CSIR:

Council of Scientific and Industrial Research

D MAX :

Maximum diameter of soils

E:

Young modulus of soils

ε :

Strain of samples

E Oed :

Oedometric modulus

ε v :

Vertical strain of samples

γ d :

Dry unit weight of soils

ε d-MAX :

Maximum dry unit weight of modified Proctor

GNT:

Graves Non Traitées

GTR:

Guide de Terrassement Routier

HRB:

High Research Board

IFSTTAR:

Institut français des sciences et technologies des transports, de l’aménagement et des réseaux

MP:

Modified Proctor

ν :

Poisson’s ratio

NFP:

Normes Françaises

OMC:

Optimum Moisture Content

PI:

Plasticity index

σ :

Stress of soils

SETRA:

Service d’études technique, des routes et autoroutes

σ ϖ :

Vertical stress of soils

TRRL:

Transport and Road Research Laboratory

US:

United State

USA:

United State of America

W:

Moisture content

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Acknowledgements

The authors of this paper would like to express their acknowledgement to many institutions and companies from Burkina Faso and France, as Institut Pascal, Cerema the “Conseil General” of Puy de Dôme in France, the Ministry of Infrastructure, the National Public Works Laboratory and Sogea Satom in Burkina Faso and many persons for their participation in data collection, testing and advices in this project.

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Authors and Affiliations

  1. CNRS, SIGMA Clermont, Institut Pascal, Université Clermont Auvergne, F-63000, Clermont-Ferrand, France

    Yassia Gansonré, Pierre Breul & Claude Bacconnet

  2. Department of Research and Innovation, Sol-Solution, France

    Miguel Benz & Roland Gourvès

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  1. Yassia Gansonré
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  2. Pierre Breul
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Correspondence to Yassia Gansonré.

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Peer review under responsibility of Chinese Society of Pavement Engineering.

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Gansonré, Y., Breul, P., Bacconnet, C. et al. Estimation of lateritic soils elastic modulus from CBR index for pavement engineering in Burkina Faso. Int. J. Pavement Res. Technol. 14, 348–356 (2021). https://doi.org/10.1007/s42947-020-0118-9

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