Characterization of Lateritic Banka Gravelous (West Cameroon) for Their Use in Road Geotechnical

  • Keyangue Tchouata Jules Hermann School of Geology and Mining (EGEM), University of Ngaoundere P.O.Box 115 Meiganga Cameroon
  • Gouafo Casimir Fotso Victor Institute of Technology of the University of Dschang Cameroon, P.O.Box 134 Bandjoun Cameroon, Laboratory of Systems and Environmental Engineering (LISIE) IUT / FV, Bandjoun University of Dschang, Cameroon
  • Katte Valentine Yato University of Bambili Cameroon, Department of Civil Engineering and Forestry Techniques
  • Ngapgue François Fotso Victor Institute of Technology of the University of Dschang Cameroon, P.O.Box 134 Bandjoun Cameroon
  • Djambou-Tchiadjeu Cédric School of Geology and Mining (EGEM), University of Ngaoundere P.O.Box 115 Meiganga Cameroon
  • Kamdjo Grégoire Fotso Victor Institute of Technology of the University of Dschang Cameroon, P.O.Box 134 Bandjoun Cameroon, Laboratory of Systems and Environmental Engineering (LISIE) IUT / FV, Bandjoun University of Dschang, Cameroon
  • Zoyem Gouafo Mathurin Fotso Victor Institute of Technology of the University of Dschang Cameroon, P.O.Box 134 Bandjoun Cameroon, Laboratory of Systems and Environmental Engineering (LISIE) IUT / FV, Bandjoun University of Dschang, Cameroon
Keywords: lateritic gravelly, granulometry, CBR lift index, Banfeko, Bakoye, Ketcho.

Abstract

In Cameroon, as in most tropical countries, the use of lateritic gravel in road construction is of great interest because of its abundance. The locality of Banka located in the department of Haut-Nkam (West-Cameroon) abounds several lateritic zones with little known characteristics. These lateritic materials are however very popular in the locality for their main use in the periodic maintenance of unpaved roads. The geotechnical identification tests carried out on 18 samples taken from the Banfeko, Bakoye and Ketcho sites have shown that the density values of the solid grains are greater than 2.57 g / cm3. The values of the plasticity indices are between 17.89 and 25.38 and those of consistency between 1,56 and 2.12 for these gravelly lateritic plastic consistency to firm. Granulometric analysis shows that the fines are less than 35%. The optimum water content values for compaction with modified Proctor energy are between 11% and 14% and those for dry optimum densities around 2.1. The values of the CBR lift index are between 31 and 51.92. These soils are subclass B6 according to the GTR and subclasses A-2-7 (1) and A-2-7 (2) according to the HRB.The particle size curves of the various samples analyzed are relatively well inscribed in the reference spindles of the materials recommended by the CEBTP for the road construction as a base course and as a base layer for these soils of the S5 lift class. But their use as a base layer requires an improvement of the bearing capacity, because the value of the CBR remains less than 80 to 95% of the modified Proctor optimum.

References

Sikali F.et al., 1986. Use of Laterites in Road Technology in Cameroon, report LABOGENIE, pp 277-288.

Ghogue, 2009. Laboratory and in-situ tests and their interpretations for geotechnical studies and control, 15p.

NF P 94-050 , 1995. Sols : Soils: recognition and testing - Determination of weight Content of materials - Steaming method.

NF P 94-058 ,1993. Soils. Recognition and testing - Determination of the density of solid particles by hydrostatic weighing.

NF P 94-056, 1996. Soils. Acknowledgments and tests. Particle size analysis Underwater. sieving. AFNOR, 16p.

NF P 94-093, 1999 Normal Proctor Assays - Modified Proctor Assay. AFNOR, 19p.

NF P 94-078, 1997. Soils: Recognition and testing. CBR index after immersion Immediate CBR index - Immediate indext. AFNOR, 12p.

NF P 94-051, 1995. Soils: determine liquidity and plasticity limits. AFNOR, 15p

Téjani A., 2008. Physical and mechanical characterization of ferralitic soils of Bafoussam and their correlations, PhD Thesis in Engineering Science, 121p.

Lohnes, R., & Demirel, T., 1973. Strength and structure of laterites and lateritic soils, Eng. Geol., 13-33.

Bohi, Z., 2008. Characterization of lateritic soils used in road construction: Case of the Agnéby Region (Ivory Coast). Doctoral thesis National School of Bridges and Roads, 121p.

Djuickouo C.N., 2012 Geotechnical characterization of lateritic gravel on basalts of the Maka area (Dschang, west-Cameroon), presented memory for a Secondary School Teacher's Diploma General Second Rank (D.I.P.E.S II) ,70p.

CEBTP, 1984. Practical guide for pavement design for tropical countries. ISBN 2-11-084-811-1, 154p.

Ananfouet Djeufack C.Y., 2012. Mapping and geotechnical characterization of soils developed on volcanic rocks of the city of Dschang, Master memory II, Fac. sciences, univ.de Dschang, 89 p.

Remillon, A., 1967. Road research undertaken in French-speaking Africa. An. Of the Inst. Tech. of Construction and Public Works No. 231, 366-388.

GTR, 1992. Guide of road earthworks, 12p.

Takala, 2017 Geotechnical characterization and evaluation in road construction of the laterites of Batoufam, article, , 16p.

Ngo’o Zé A., 2011 Effects of lime on some physico-mechanical properties of two lateritic gravel from the Akonolinga area (central region). Master II memory.fac. Sci. univ. Yaoundé I, 97 p

Nanga Bineli M.T., 2014. Geological and Geotechnical Characterization of Gravel Lateritic on Granites in the Ebolowa Region (Southern Cameroon), Master II Dissertation , univ.de Yaoundé I, 73 p.

Eyenga P., 2011. Geotechnical characterization of alteration products on Sa'a Quartzites, Master II, univ. from Yaoundé I, 81p.

Autret P., 1982. Contribution to the study, gravelly lateritic. Withdrawal limits Liaison Newsletter of the Bridges and Roads Laboratories, n° 118, pp. 7-16.

Bagarre E., 1990. Use of lateritic gravels in road construction, document from the Institute of Science and Technology of Equipment and the environment for development, 143p.

Geological map of Cameroon, 1972.

Published
2019-05-12
Section
Articles