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Study of the Curing Temperature of 600°C, 700°C and 800°C of Mouyondzi Clay on the Mechanical, Physical and Microstructural Properties of Geopolymer Obtained

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Journal of Minerals and Materials Characterization and Engineering 2022年第2期10卷 185-197页

作者： Vezolo Stanislas Ifo Grace Mazel foutou paul mozalin Loubaki Raunel Diamouangana Zita Flora Moutou Joseph-Marie Laboratoire de Chimie Minérale et Appliquée Faculté des Sciences et Techniques Université Marien NGOUABI Brazzaville Republic of the Congo Faculté des Sciences et Techniques Université Marien NGOUABI Brazzaville Republic of the Congo Ecole Normale Supérieure Université Marien Ngouabi Brazzaville Republic of the Congo

This work consists of determining the right curing temperature for Mouyondzi clay, with a view to obtaining a very reactive metakaolinic amorphous phase, which will give us a geopolymer with good physical and mechanical performance. The kaolin-dominant Mouyondzi clay was calcined at 600℃, 700℃ and 800℃ with a heating rate of one degree per minute. In order to achieve the objective of this work, the performance of geopolymer was measured by compressive strength on geopolymer prisms of 28 days of age, by XRD and IRFT of geopolymer powders, calcined clay and raw clay, and by SEM of geopolymer blocks. Analysis of the results shows that the resistance value increases with the curing temperature of the clay and reaches a maximum of 49 MPa at 800℃. At 600℃ we already have 31 MPa, the equivalent of Portland cement with the addition. The XRD confirms the disappearance of clay species from 600℃. At 800℃ there is not yet the appearance of a new crystalline phase. Quartz is the only mineral species present. We can therefore confirm that at 800℃, the geopolymer obtained exhibits higher physical and mechanical performance than the other curing temperatures studied for Mouyondzi clay. This is confirmed by the appearance of a new aluminosilicate phase in the IRFT spectra and in the SEM images appearing as a continuous plate.

关键词： Geopolymer Compressive Strength Mouyonszi Clay Amorphous Phase

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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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Characterization and Evaluation of the Potential Uses of Mouyondzi Clay

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Journal of Minerals and Materials Characterization and Engineering 2018年第1期6卷 119-138页

作者： Joseph Marie Moutou paul mozalin foutou Laurent Matini Vivien Banzouzi Samba Zita Flora Diamouangana Mpissi Raunel Loubaki Laboratoire de Chimie Minérale Appliquée Faculté des Sciences et Techniques Université Marien Ngouabi Brazzaville Congo Ecole Normale Supérieure Université Marien Ngouabi Brazzaville Congo

The overall goal of this study is to characterize and to evaluate the potential uses of clay mined in the Nzaou locality. The Mou sample is argillaceous texture and medium plasticity (Ip = 28.9). Kaolinite is dominant clay species (44.41%). It is associated with illite (9%). Quartz and rutile are the main non clay minerals. The CEC is 8.66 cmol+/kg. Organic matter is low (0.839%). Total shrinkage obtained by dilatometry at 1200°C is 9.26%. The chemical and mineralogical compositions have allowed using the ternary diagrams of Fabbri and Fiori that the MOU clay is favorable for glazed white stoneware (GWS) and for the production of clinker (KLK). Dondi typologies of ceramic tiles according to body color (mostly depending on the iron oxide content) and compactness (expressed by water absorption) have confirmed the use for the manufacture of the GWS and clinker. Classification always according to Dondi taking into account the rate of kaolinite, the fine fraction (°C will be vitrified. Flexural strength at 1200°C (16 MPa) does not correspond to the requirements of GWS or a clinker.

关键词： Mouyondzi Clay Mineralogy Technological Properties Potentiality Ceramic Tiles

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Characterization and Valuation of a Clay Soil Sampled in Londéla-Kayes in the Republic of Congo

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Journal of Minerals and Materials Characterization and Engineering 2021年第2期9卷 117-133页

作者： Roger Makosso Voula Flora Zita Mpissi Diamouangana Joseph-Marie Moutou Vivien Igore Banzouzi Samba mozalin paul foutou Julien Placide Ngoma Laboratoire de Chimie minérale et Appliquée Faculté des sciences et Techniques University Marien Ngouabi Brazzaville Congo Ecole Normale Supérieure University Marien Ngouabi Brazzaville Congo

In order to characterize and enhance clay collected in Londéla-kayes in the Republic of Congo, in this work, it was a question of proceeding to the mineralogical, physico-chemical, thermal and geotechnical characterization of this clay. Next, determine the technological properties of fired bricks. For this, various methods were used in particular: X-ray diffraction, infrared spectroscopy, gravimetric thermal analysis and differential thermal analysis, dilatometric analysis, scanning electron microscopy, specific surface and analysis chemical. It appears that, for the mineralogical characterization, kaolinite is the most abundant mineral of this clay. The results of dilatometric analysis have shown that this clay can be fired at low temperatures. The geotechnical characterization showed that it is plastic clay thus exhibiting a high shrinkage. The results of the technological properties of LON1 bricks have shown that this clay cannot be used in the manufacture of fired bricks. The geotechnical properties must be improved by adding additives in order to improve the technological properties of the fired bricks.

关键词： Clay Characterization Valuation

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Stroke and HIV: Correlation between Viral Load and Type of Stroke

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Neuroscience & Medicine 2021年第4期12卷 163-167页

作者： Prince Eliot Galieni Sounga Bandzouzi Ghislain Armel Mpandzou Josué Euberma Diatewa Patience Moudeko M’foutou Dina Happia Motoula-Latou Charles Godefroy Koubemba paul Macaire Ossou-Nguiet Donatien Moukassa Faculty of Health Sciences Marien N’GOUABI University Brazzaville Republic of Congo Department of Neurology Loandjili General Hospital Pointe-Noire Republic of the Congo Department of Neurology University Hospital of Brazzaville Brazzaville Republic of Congo

Introduction: The role of immunosuppression of TCD4+ lymphocytes in the onset of stroke in people living with HIV has been reported in numerous studies examining the co-morbidity of stroke and HIV. Objective: To determine the correlation between the viral load and the type of stroke. Methodology: This was a 7-month cross-sectional descriptive study carried out in the Neurology Department of Loandjili General Hospital in Pointe-Noire. The study population consisted of patients living with HIV who had a stroke confirmed by brain scan. The sero-immunological investigation consisted of looking for T lymphocyte typing from two kits: a CD4+ T lymphocyte typing reagent kit (BD FACS Presto TM) and a GeneXpert kit for viral load (Xpert®HIV-1 Viral Load). The database was made from the 2010 version of Microsoft Excel. Results: We included 16 patients living with HIV, 56% of whom were women with a sex ration of 0.78. The mean age was 56.92 ± 11.21. The mean number of TCD4+ lymphocytes was 413.44 ± 677.95/mm3;minimum: 93/mm3;maximum: 2854/mm3. The mean viral load was 17,996.31 ± 20,982.22/mm3;minimum: 1002/mm3;maximum: 67,229/mm3. No significant difference between the viral load and the occurrence of the stroke (p = 0.13). Conclusion: Our study did not show a causal link between viral load, immunosuppression of TCD4+ lymphocytes and the onset of stroke.

关键词： Viral Load HIV Stroke

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