DEVELOPMENT OF A NEW PRODUCT FOR THE OPTIMIZATION OF THE GEOTECHNIC CHARACTERISTICS OF THE BASE COURSE IN THE ROADS CONSTRUCTION IN SOUDANO-SAHALIAN AREA: CASE STUDY OF THE MAROUA AGGLOMERATION Journal title: International Journal of Civil Engineering and Technology Authors: FLAVIEN GUETSA KAMANOU, DENIS NTAMACK, THOMAS TAMO TATIETSE Subject(s): Engineering, Civil Engineering