Stabilization of a Lateric Clay from Burkina Faso with Cement-Metakaolin for an Application in Road Construction

The objective of this work is to obtain a composite clay-cement-metakaolin having good mechanical properties and geotechnical. To do this, lateritic clay from Burkina Faso referenced ALK was characterized by various methods (X-ray diffraction, infrared spectrometry, thermal analysis Inductively Coupled Plasma, Atomic Emission Spectrometry) in order be used as base course after adding cement metakaolin. results the mineralogical characterization showed that it composed kaolinite (65.7 wt.%), quartz (19.3 wt.%) goethite (10.8 wt.%). geotechnical tests carried out moderately plastic with plasticity index Ip = 22%. optimum moisture content maximum dry density are respectively 15.9% 1.76 g∙cm-3. Simple compressive strength splitting tensile Rc 1.59 MPa ft 0.149 respectively. California Bearing Ratio (CBR) at 95% 40% above minimum value 30% shows can sub-base road construction. addition metakaolin proportions improved CBR composites produced. This improvement due formation hydrated calcium silicate (CSH) resulting pozzolanic reaction between portlandite amorphous silica Thus 2 wt.% 6 formulation 95%CBR 81% suitable for development