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Comparative Analysis of Statistical Thickness Models for the Determination of the External Specific Surface and the Surface of the Micropores of Materials: The Case of a Clay Concrete Stabilized Using Sugar Cane Molasses

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Geomaterials 2024年第2期14卷 13-28页

作者： Nice Mfoutou Ngouallat Narcisse Malanda Christ Ariel Ceti Malanda Kris Berjovie Maniongui erman eloge nzaba madila Paul Louzolo-Kimbembe Mechanics Energy and Engineering Laboratory Higher National Polytechnic School Marien Ngouabi University Brazzaville Republic of the Congo National Institute for Research in Engineering Sciences Innovation and Technology (INRSIIT) Brazzaville Republic of the Congo Higher Institute of Architecture Building Planning and Public Works Denis SASSOU N&#8217GUESSO University Kint&#233l&#233 Republic of the Congo Hydrogen Research Institute University of Quebec in Trois Rivieres Quebec Canada Superior Normal School (ENS) Marien Ngouabi University Brazzaville Republic of the Congo

In this work, four empirical models of statistical thickness, namely the models of Harkins and Jura, Hasley, Carbon Black and Jaroniec, were compared in order to determine the textural properties (external surface and surface of micropores) of a clay concrete without molasses and clay concretes stabilized with 8%, 12% and 16% molasses. The results obtained show that Hasley’s model can be used to obtain the external surfaces. However, it does not allow the surface of the micropores to be obtained, and is not suitable for the case of simple clay concrete (without molasses) and for clay concretes stabilized with molasses. The Carbon Black, Jaroniec and Harkins and Jura models can be used for clay concrete and stabilized clay concrete. However, the Carbon Black model is the most relevant for clay concrete and the Harkins and Jura model is for molasses-stabilized clay concrete. These last two models augur well for future research.

关键词： Statistical Thickness Model External Specific Surface Microporous Surface Clay Concrete Molasses

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Microstructure of Fine Clay Soils Stabilized with Sugarcane Molasses

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Open Journal of Civil Engineering 2022年第2期12卷 247-269页

作者： Narcisse Malanda Nice Ngouallat Mfoutou erman eloge nzaba madila Paul Louzolo-Kimbembe National Upper Polytechnic School Marien Ngouabi University Brazzaville Republic of Congo Department of Chemistry Biochemistry and Physics and Hydrogen Research Institute University of Quebec in Trois-Rivières Trois-Rivières Canada National Upper Education School Marien Ngouabi University Brazzaville Republic of Congo

Sugar cane molasses has proved cohesive and excellent performance on soil aggregates (fine particles). However, the microstructure of consolidated soil by the molasses is not yet subjected to research. The analysis results of sample without molasses (0%) and consolidated samples at 8%, 12%, and 16% show that the molasses acts on the structure of clayey fine soil developing its microstructure of airy matrix type (sample without molasses (0%) to a microstructure of a qualified type, more solid. Consolidated samples to 8%, 12%, 16% of molasses). We also observe the presence of inter-aggregate pores (mesopores) of similar size in all samples. The results of porosimetrical analyses (BJH) of the sample without molasses and consolidated samples to 8%, 12%, and 16% show that simultaneous porous volumes of samples are reduced with the increasing of molasses quantity. This latter, therefore, acts on the porous volume (micropore 2 nm and mesopore 9 nm) by reducing them which really means, molasses occupies the porous volume of the sample. However, this sample seems not to have any effect on the size of mesopores 9 nm. Thus, this product induces the evolution of the soil structure towards the highly dense and condensed structure. Consequently, materials in consolidated soil by molasses will have mechanical properties far superior to those of materials consolidated soil without molasses.

关键词： Microstructure Consolidated Clayey Fine Soil Molasses of Sugar Cane Mesopore Micropore Specific Surface Area

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Characterization of the Clay Collected in the Locality of Dolisie in Congo-Brazzaville

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Journal of Minerals and Materials Characterization and Engineering 2022年第2期10卷 93-105页

作者： Rarahu Nursie Mboho Oba Grace Mazel Ifo erman eloge nzaba madila Flora Zita Mpissi Diamouangana Thierry Vila Mozalin Paul Foutou Joseph-Marie Moutou Laboratoire de Chimie Minérale Appliquée (LACMA) Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Congo Brazzaville Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Congo Brazzaville Département de Chimie Biochimie et Physique and Institut de Recherche sur l’Hydrogène Université du Québec à Trois-Rivières Trois-Rivières Québec Canada Ecole Normale Supérieure Université Marien Ngouabi Brazzaville Congo Brazzaville

This work aims at the characterization of the clay of the locality of Dolisie for its valorization. The mineralogical analysis was determined by the following techniques (DRX, IR, ATG and ATD), chemical analysis was determined by ICP-AES, CEC was assessed by the Metson method. The geothermal properties were determined by the granulometric analysis of the clay soil and allowed us to position the Dolisie clay in the texture triangle, the landings limits obtained allowed to place the Dolisie clay in the abacus of Casagrande and on the workability map of Bain and Highy. Chemical analysis showed that silica alumina as well as iron oxides are the major constituents in Dolisie clay The mineralogical balance showed that kaolinite and illite have similar percentages which are (20.51%) kaolinite, (28.08) illites. This leads us to believe that kaolinite is not the dominant mineral and the IR spectrum shows that kaolinite is poorly crystallized.

关键词： Clay Characterization Mineralogy Valuation

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Adsorption Isotherm of BET Nitrogen of Concretes with Consolidated Soil by Sugar Cane Molasses

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材料科学与工程（中英文B版） 2022年第3期12卷 78-96页

作者： Nice Ngouallat Mfoutou Narcisse Malanda erman eloge nzaba madila Paul Louzolo-Kimbembe National Upper Polytechnic School Marien Ngouabi UniversityBrazzaville BP.69Congo Department of Chemistry Biochemistry and Physics and Hydrogen Research InstituteUniversity of QuebecTrois-RivièresQuébecG9A5H7Canada Upper School of Education Marien Ngouabi UniversityBrazzaville BP.69Congo

Sugar cane molasses is often poured out on roads with soil in the city of Nkayi,Republic of Congo in order to reduce the *** physical adsorption has allowed us to collect information on the state of the accessible total area according to the quantity of sugar cane *** adsorption isotherms,the specific area,the adsorbed quantity of nitrogen on a Qm mono layer,the number of molecules constituting the adsorbed sugar cane molasses(n′)have been *** obtained results show that the quantity of sugar cane molasses in the material does not modify the adsorption isotherm of nitrogen of type IV that remains and a hysteria loop of type H4 in all samples,this justifies the monocoat-multicoat adsorption mechanism with capillary condensation and mesopores presence in the structure of *** with elaborated raw soil by clayey fine soil used are mesoporous *** of 50×1018 molecules constituting sugar cane molasses occupy the extreme area accessible to soil clay,without occupying on accessible sites.

关键词： Isotherm adsorption BET(Brunauer Emmet and Teller)specific area clayey fine soil sugar cane molasses

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Characterization of the Natural and Organomodified Clay Soil of Moukosso (Republic of Congo) by Dimethylsulfoxide: Application to the Adsorption of Lead (II) in Aqueous Solution

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Materials Sciences and Applications 2023年第2期14卷 63-77页

作者： Ottard Arnaud M. R. Ossiby Mwa Ngo Ferland Ngoro-Elenga erman E. nzaba madila Zita F. Diamouangana Mpissi Exaucé R. Kinzonzi Ngongot Joseph Marie Moutou Laboratoire de Chimie Minérale et Appliquée Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Congo Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Congo Centre de Recherches Géologiques et Minières Brazzaville Congo Institut de Recherche sur l’Hydrogène Université du Québec à Trois-Rivières Québec Canada Ecole Normale Supérieure Université Marien Ngouabi Brazzaville Congo

In this study, the authors characterized the raw clayey soil of Moukosso and modified by dimethylsulfoxide (DMSO) by several analytical methods, namely: X-ray diffraction (XRD), Fourier transform infrared (FTIR) and gravimetric thermal analysis (TGA). The cation exchange capacity (CEC) was also determined. Mineralogical analysis by XRD revealed the presence of muscovite (29.7%), kaolinite (8.9%), anatase (2.4%) and quartz (58.9%). The characterization of the organo-clay by infrared and by thermogravimetric analysis confirmed the intercalation of DMSO by the presence of vibration bands at 1008 cm-1 and 1070 cm-1 and a strong increase in the loss of mass. The cation exchange capacity of the raw material is 7.4 meq/100g. Rapid adsorption of Pb2+ ions was observed between 5 and 15 minutes of stirring time in both cases (raw clay and organomodified clay). The modeling of the isotherms by the models of Langmuir and Freudlich showed that these are of type S with a maximum amount of adsorption of 22.471 mg/g for the fine fraction and 41.493 mg/g for the clay intercalated with DMSO. Langmuir’s model best reproduces the experimental data of this study.

关键词： Clay Dimethylsulfoxide Organoclay Characterization Adsorption Isotherm Moukosso

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