This research work is undertaken with the aim of contributing to development local building materials in certain provinces Chad (Abeche, NDjamena and Sarh). Physico-chemical mechanical characterizations are carried out on samples from these Provinces. It emerges geotechnical study that soils Abeche silty-clayey respective plasticity indices (PI) 32% for 19.86% as soil Sarh, it corresponds a loa...