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

Journal of Materials Science and Chemical Engineering 2023年第6期11卷 1-20页

作者： Souleymane Sanou Issiaka Sanou Moussa Ouedraogo Halidou Bamogo lohami valentin landry gnoumou Younoussa Millogo Seynou Mohamed Laboratoire de Chimie et Energies Renouvelables (LaCER) Département de Chimie Université Nazi BONI (UNB) Bobo Dioulasso Burkina Faso Laboratoire de Chimie Moléculaire et des Matériaux (LC2M) Département de Chimie Université Joseph KI-ZERBO (UJKZ) Ouagadougou Burkina Faso

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

关键词： Lateritic Clay Cement Metakaolin Road Construction The California Bearing Ratio Index

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