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See detailcaractérisation physico-chimique et minéralogique de matériaux calcaro-dolomitiques en vue de la production de liants et produits dérivés
Matamba Jibikila, Raphaël ULg

Doctoral thesis (2014)

Due to their abundance and availability, limestone and dolomitic rocks are among the most valued resources in the world. As natural stones, they have many applications, both in trade and industrial ... [more ▼]

Due to their abundance and availability, limestone and dolomitic rocks are among the most valued resources in the world. As natural stones, they have many applications, both in trade and industrial sectors. Moreover, regardless of the scope of these materials, they must meet specific mineralogical and mechanical or physico-chemical properties, depending on the sector. Environmental requirements and sustainable management of mineral resources, have forced companies to reduce the value of naturally occurring materials, focusing oriented processing of waste materials or alternative approach. Moreover, technological developments have led to new applications requiring maximum purity of the material also led farmers to manage natural resources in a more rational manner. Mbuji-Mayi Region in the Democratic Republic of Congo, has huge limestone and dolomitic deposit; located in the " Mbuji-Mayi Supergroup". Nevertheless, the city suffers from a serious lack of sustainable infrastructure to consolidate its development and remains dependent on the supply of construction and building materials from other regions, located sometimes more than 1000 km from the Mbuji-Mayi site. The aim of this thesis is to investigate the potential use of Mbuji-Mayi supergroup materials to produce binder or derivated products in a sustainable management of mineral resources way. Thus, dolomitic samples were taken from Kanshi S13B and S70 Lubi drill cores, while limestone facies are from artisanal quarries in the region. They were then prepared and characterized. Techniques used are: X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), thermogravimetric analysis and the differential scanning calorimetry (TG-DSC), optical microscopy (OM) and scanning electron microscopy combined with chemical microanalysis (SEM / EDX). The results obtained after raw materials characterization showed that the Mbuji-Mayi Supergroup contains pure dolomite (respective mean CaO and MgO contents of 20.5 and 30%), impure dolomites and impure limestones. uniaxial compressive strength test, water absorption coefficient, and porosity were measured. Results were satisfactory in terms of the use of materials such as rubbles or building stones. Thermal and microscopic analyzes of pure dolomite, showed that these materials have high added value in the areas of refractory, glass manufacture or dolomitic lime production. Finally, a binder (CS1c) prepared from impure limestone, posted quite sufficient characteristics for applications with low mechanical stress. Metakaolin prepared from local raw material, was used to improve the characteristics of the binder CS1c. The analysis of the properties of the mixture CS1c-metakaolin, helped us to understand the role of some mineral phases, in contributing to the development of mechanical strength of such binders.   [less ▲]

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See detailCharacterization of material for cement production in Mbuji-Mayi area (DR Congo)
Matamba Jibikila, Raphaël ULg; Pirard, Eric ULg

in ACCTA johannesburg 2013 (2013)

Although the City of Mbuji-Mayi (DR Congo) is rich in limestone and clay deposits, cement and other building materials are still being imported sometimes by plane from Kinshasa, Zambia and Tanzania. A ... [more ▼]

Although the City of Mbuji-Mayi (DR Congo) is rich in limestone and clay deposits, cement and other building materials are still being imported sometimes by plane from Kinshasa, Zambia and Tanzania. A consequence of this situation is low consumption of cement and concrete (less than 1kg per capita) and a lack of modern and sustainable infrastructures. Our study provides a qualitative assessment of all cement raw materials available in the region, including limestone and clay in order to produce hydraulic binder with optimized technical and environmental performances. Chemical and mineralogical characterizations were done using XRF spectroscopy and X-ray diffraction (XRD). Thermal analysis, electron microscopy, and mechanical characterizations are planned to assess the performance of the concrete and mortar manufactured with the binder produced. Finally, the ultimate goal is to produce a local hydraulic binder whose physical and mechanical characteristics are similar to those of Portland cement, but whose production is expected to consume less energy and emit less CO2. [less ▲]

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See detaileffective use of dolomitic material in Mbuji-Mayi region
Matamba Jibikila, Raphaël ULg

Conference (2012, September 12)

En vue d'une utilisation efficace de matériaux dolomitiques du supergroupe de Mbuji-Mayi (RD Congo), une caractérisation méticuleuse de chaque faciès de matériau s'impose. Cela permettrait une bonne ... [more ▼]

En vue d'une utilisation efficace de matériaux dolomitiques du supergroupe de Mbuji-Mayi (RD Congo), une caractérisation méticuleuse de chaque faciès de matériau s'impose. Cela permettrait une bonne gestion de ressources en définissant pour chaque faciès, des applications optimales et durables. [less ▲]

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See detailValorisation des matériaux de construction en RD Congo:Aspects environnementaux et développement durable
Matamba Jibikila, Raphaël ULg; Wetshondo Osomba, Dominique ULg

Scientific conference (2011, September 23)

The exploitation of mineral resources other than building materials was for a long time the main business sector in RD-Congo. Further to the striking degradation of the road infrastructure and various ... [more ▼]

The exploitation of mineral resources other than building materials was for a long time the main business sector in RD-Congo. Further to the striking degradation of the road infrastructure and various architectural works, it turned out indispensable to investigate the various resources in building materials (abundant in the country), to characterize them in order to indicate the fields of appropriate applications. In this note, we are respectively interested in the carbonated and clayey materials of the regions of Mbuji-Mayi and Kinshasa. And we show the various valuations that meet the criteria of sustainable development. [less ▲]

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