eng Science and Education Publishing American Journal of Civil Engineering and Architecture 2328-3998 2026-01-08 14 1 1 10 10.12691/ajcea-14-1-1 AJCEA20261411 article Papa Sanou Faye sanou.faye@univ-thies.sn 1 Adama Dione 2 Issa Ndoye 2 Saliou Pene 2 Fatou Samb 3 Ibrahima Khalil Ciss¨¦ 4 Laboratoire L2M; UFR Sciences et technologies, Universit¨¦ Iba Der Thiam de Thi¨¨s, Thi¨¨s, S¨¦n¨¦gal Laboratoire de G¨¦o mat¨¦riaux, ¨¦cole Nationale Sup¨¦rieure des Mines et de la G¨¦ologie, Dakar, S¨¦n¨¦gal Laboratoire L2M; UFR Sciences de l¡¯Ing¨¦nieur, Universit¨¦ Iba Der Thiam de Thi¨¨s, Thi¨¨s, S¨¦n¨¦gal Laboratoire de Mat¨¦riaux, M¨¦canique et Hydraulique, ¨¦cole polytechnique de Thi¨¨s, Thi¨¨s, S¨¦n¨¦gal Lateritic gravels (LG) constitute a strategic material for road construction in Senegal. This study aims to map and perform a geotechnical characterization of lateritic borrow pits from the Dakar and Thiès regions, in order to assess their suitability for use in sub-base and base layers of road pavements. Physical and mechanical tests were carried out on laterites from nine sites in their natural state, and after stabilization with 1%, 2%, and 3% cement. The results show that most laterites from the Dakar and Thiès regions except those from the Ngoundiane and Lam-Lam quarries, which exhibit excessive plasticity (PI > 25%) are suitable for use as sub-base materials (CBR > 30%). However, most of them do not meet the CEBTP and AGEROUTE standards for base course applications. After cement stabilization at 1%, 2%, and 3%, the CBR values range between 54% and 374.53%. Laterites from Toglou 1, Sindia, and Tchicky can be used as base course materials (CBR at 95% > 80%, and in some cases > 160%) starting from 2% cement content, while all laterites become suitable from 3% cement, except Lam-Lam, which meets specifications only at 4% cement content. Unconfined compressive strength (UCS) tests on cement treated laterites (1%, 2%, and 3%) yielded results that comply with CEBTP (1984) standards (1.8 < Rc < 3.0 MPa). In terms of tensile strength, only the Sindia, Toglou, Yeba, and Tchicky quarries met the CEBTP criterion (Rt > 0.3 MPa) after 3% cement treatment. https://pubs.sciepub.com/ajcea/14/1/1/ajcea-14-1-1.pdf Geotechnical mapping lateritic gravels CBR base course sub-base borrow pits Dakar Thi¨¨s Senegal