Petrographic and Geotechnical Characterization of Granites from the N’Goura Massif (Center-Sud/Tchad): Implication for their Used in Civil Engineering

This work deals with the petrographic and geotechnical characterization of rocks from N'goura massif focus on their use in civil engineering. The study area is located central southern Chad, about 205km to north N'Djamena. monzogranitic two micas. outcrop as blocks, slabs balls displaying fine, medium coarse grained minerals. Monzogranite composed 34% quartz, 32% alkali feldspar, 26% plagioclase, 4% biotite, 2% muscovite 1% chlorite average. Geotechnical data show that aggregates obtained this rock have a Los Angeles coefficient ranging 22.70 38.70% an average 30.70%, Microdeval 4 13% 8.5% dynamic fragmentation 11.43 18.57% 15%. These results indicate studied materials are suitable be used for construction engineering works. correlation between reveals size (texture), grain structure mineralogical composition (Qtz, Kfs Bt+Ms+Chl+Ser) influence behavior these materials.