eng Science and Education Publishing American Journal of Civil Engineering and Architecture 2328-3998 2018-06-30 6 5 172 179 10.12691/ajcea-6-5-1 AJCEA2018651 article AMEY Kossi Bollanigni ameykoss3@yahoo.fr 1 SAMAH Ouro-Djobo 2 NEGLO Koumah 2 AMOUSSOU Komlan 3 SOUNSAH Komi Mawutodzi 3 TCHAMDJA Bawubadi 4 Ecole Nationale Supérieure des Ingénieurs (ENSI) de l’Université de Lomé (UL), BP 1515, Lomé, Togo Equipe de Recherche et Devéloppement de FORMATEC, BP 20436 Lomé, Togo Centre de Construction et de Logement (CCL), BP 1762, Lomé, Togo Laboratoire National du Bâtiments et des Travaux Publics (LNBTP), BP 20100, Lomé, Togo This study consists in experimentally determining a formula of mortar got from silty sands of Togo for the purpose of optimal mechanical properties. 1,443 4cmx4cmx16cm test tubes of mortars made from silty sands of 12 sites of extraction of Togo are prepared at variations of water and cement. The results show that for the water-cement ratio (E/C) of 0.5, the evolution of resistances in compression at 28 days of age (σc) increases exponentially to C/S and E/S ratios ranging between 0.311 to 0.512 and 0.156 to 0.256 (σc=aeb1(C/S)=aeb2(E/S) with 0.061<a<0.182, 11.08<b1<12.9 and 22.17<b2<25.80). They become stationary beyond these values (σcҡ19MPa to 35,45MPa). Two formulas of rich mortars (E/C=0.5, C/S>0.512 and E/S>0.226) and lean (E/C=0.5, C/S<0.311 and E/S<0.156) silty sands taken in Togo are therefore defined. http://pubs.sciepub.com/ajcea/6/5/1/ajcea-6-5-1.pdf silty sand mortar Togo mechanical properties