Abstrakt

Valorization of Lateritic Nodules in Concrete: State of The Art and Perspectives

Paulin Djimonnan*1, Yvette S. Tankpinou Kiki2, Gbènondé S.G. Milohin2, Victor S.Gbaguidi2 and Mohamed Gibigaye2

The exponential needs of construction have created the scarcity of aggregates commonly used in the composition of concrete. The lateritic gravelly is one of the most widespread materials in tropical Africa. To overcome the lack of common aggregates, lateritic nodules have been the subject of studies, namely the substitution of the aggregates commonly used by lateritic nodules in concrete. Concretes have variable mechanical characteristics depending on the region but are acceptable for medium-sized structures. In fact, the compressive strength at 28 days is mostly greater than 24 MPa. The tensile strength varies from 2.42 to 3.40 MPa for a dosage of 350 kg/m3. Lateritic nodules admit a high degree of water absorption. This compilation made it possible to identify several aspects of the study that still need to be further explored, in particular the influence of the inherent strength of the nodules and the mineralogy on the mechanical strengths of the concrete. With regard of the chemical and mineralogical composition, study reveals a dominance of iron oxides, of aluminum oxides, quartz and kaolinite