5 results on '"Kouka Amed Jérémy Ouedraogo"'
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2. Characterization of Earth Used in Earth Construction Materials
- Author
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Claudiane Ouellet-Plamondon, Elodie Prud'Homme, Paulina Faria, Jean-Emmanuel Aubert, Pascal Maillard, and Kouka Amed Jérémy Ouedraogo
- Subjects
Rammed earth ,Qualitative analysis ,Earth materials ,Earth (chemistry) ,Field tests ,Civil engineering ,Geology ,Characterization (materials science) - Abstract
The objective of this chapter is to present the physical, geotechnical, chemical and mineralogical characterization techniques used to characterize the raw material (earth and mineral addition, such as sand and gravel) contained in the earth materials manufactured with different techniques: earth bricks, rammed earth or cob. This chapter will be divided into 6 sections. The first will present the method used to find the references considered in this state of the art and we will carry out a general qualitative analysis of these references. The other sections will deal respectively with granular, geotechnical, chemical and mineralogical characteristics and, finally, the last part will be dedicated to field tests.
- Published
- 2021
- Full Text
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3. Improvement of water resistance and thermal comfort of earth renders by cow dung: an ancestral practice of Burkina Faso
- Author
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Halidou Bamogo, Kalifala Dao, Moussa Ouedraogo, Kouka Amed Jérémy Ouedraogo, Jean-Emmanuel Aubert, Younoussa Millogo, Issiaka Sanou, Laboratoire Matériaux et Durabilité des constructions (LMDC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)
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Archeology ,Goethite ,Materials science ,Abrasion (mechanical) ,Materials Science (miscellaneous) ,chemistry.chemical_element ,02 engineering and technology ,Conservation ,Raw material ,01 natural sciences ,chemistry.chemical_compound ,[SPI]Engineering Sciences [physics] ,Kaolinite ,Quartz ,Spectroscopy ,ComputingMilieux_MISCELLANEOUS ,010401 analytical chemistry ,Metallurgy ,021001 nanoscience & nanotechnology ,Nitrogen ,Silicate ,0104 chemical sciences ,[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering ,chemistry ,Chemistry (miscellaneous) ,visual_art ,visual_art.visual_art_medium ,0210 nano-technology ,General Economics, Econometrics and Finance ,Cow dung - Abstract
The main objective of this study was to improve some properties (physical, mechanical, hydric and thermal) of earth renders amended by cow dung, as such amendment is an ancestral practice in Burkina Faso. For this purpose, raw clayey material from Kodeni (in western Burkina Faso), mainly composed of kaolinite (62 wt.%), quartz (31 wt.%) and goethite (2 wt.%) and having adequate geotechnical properties was used to elaborate earth renders reinforced with up to 6 wt.% of cow dung. The cow dung studied was mainly made up of small vegetable fibres, clayey minerals and quartz consumed by cows. Cow dung incorporation limits the spread of cracks and hardens the material thanks to the good adhesion of cow dung to the clayey matrix, which is linked to the rough surface of fibres contained in cow dung. The presence of cow dung in an earth render influences its mineralogy through the formation of insoluble amine silicate (Si(OH)4. 4NH3). This compound is formed during the reaction between fermented cow dung with mainly fine crushed quartz and feebly kaolinite in basic medium. The molecule formed links isolated raw material particles through free electronic doublets on the oxygen atoms and especially on the nitrogen atoms. The consequence of this effect is an improvement of the microstructural, physical and mechanical properties of earth renders. In particular, their thermal conductivity is reduced as the fibres present in the composite materials are rich in cellulose (molecule with thermally insulating properties), and their resistance to abrasion and to water is good. The earth renders elaborated in this way help to provide water resistant housing with good thermal comfort.
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- 2020
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- View/download PDF
4. Is stabilization of earth bricks using low cement or lime contents relevant?
- Author
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Gilles Escadeillas, Kouka Amed Jérémy Ouedraogo, Jean-Emmanuel Aubert, Christelle Tribout, Laboratoire Matériaux et Durabilité des constructions (LMDC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), and Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées
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Materials science ,Moisture buffer value ,0211 other engineering and technologies ,Cement ,020101 civil engineering ,Compressive strength ,02 engineering and technology ,engineering.material ,Water resistance ,0201 civil engineering ,[SPI]Engineering Sciences [physics] ,021105 building & construction ,Thermal ,Earth bricks ,General Materials Science ,Civil and Structural Engineering ,Lime ,Mineral ,Moisture ,Hydrated lime ,Metallurgy ,Building and Construction ,Stabilization ,[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering ,Thermal conductivity ,Soil water ,engineering ,Earth (classical element) - Abstract
International audience; The starting premise of this article is that it is not environmentally consistent to stabilize earth by using more than 4% of mineral binder (cement or lime). Thus, this paper presents a study of the effects of low mineral binder contents (2 and 4%) on the properties of earth bricks. The results obtained on two different soils show that the effects are not observable for dry compressive strengths or for dry thermal conductivities but the addition of small amounts of mineral binders significantly modifies the resistance to water and the Moisture Buffer Value.
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- 2020
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5. Laboratory test to assess sensitivity of bio-based earth materials to fungal growth
- Author
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Camille Magniont, Christine Roques, Jean-Emmanuel Aubert, Christophe Roux, Alexandra Bertron, Aurélie Laborel-Préneron, Kouka Amed Jérémy Ouedraogo, Matthieu Labat, Alexis Simons, Laboratoire Matériaux et Durabilité des constructions (LMDC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Laboratoire de Génie Chimique (LGC), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Interactions Microbiennes dans la Rhizosphère et les Racines, Laboratoire de Recherche en Sciences Végétales (LRSV), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Matériaux, Procédés et Technologie des Composites, Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Laboratoire Matériaux et Durabilité des constructions [Toulouse] ( LMDC ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ), Laboratoire de génie chimique ( LGC ), Institut National Polytechnique [Toulouse] ( INP ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Recherche en Sciences Végétales ( LRSV ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Laboratoire de génie chimique [ancien site de Basso-Cambo] (LGC), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3)
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Fungal growth ,Environmental Engineering ,Geography, Planning and Development ,[ SPI.MAT ] Engineering Sciences [physics]/Materials ,0211 other engineering and technologies ,Earth materials ,Building material ,02 engineering and technology ,010501 environmental sciences ,engineering.material ,Bacterial growth ,medicine.disease_cause ,Plant aggregate ,01 natural sciences ,[SPI.MAT]Engineering Sciences [physics]/Materials ,[ SPI.GCIV.CD ] Engineering Sciences [physics]/Civil Engineering/Construction durable ,Mold ,021105 building & construction ,medicine ,Génie chimique ,Relative humidity ,Food science ,Génie des procédés ,0105 earth and related environmental sciences ,Civil and Structural Engineering ,[SPI.GCIV.CD]Engineering Sciences [physics]/Civil Engineering/Construction durable ,Inoculation ,Chemistry ,Indoor environment ,Building and Construction ,Straw ,engineering ,Aspergillus brasiliensis ,Unfired earth - Abstract
International audience; The effect of molds present in buildings on the health of the occupants is a major issue hence, when a building material is developed, its sensitivity to microbial growth should be assessed. However, few studies have investigated fungal growth on bio-based building materials with the resources available in a laboratory specializing in materials. The objective of this paper is thus to propose a simple and efficient experimental method useful for construction materials laboratories, adapted from methods proposed in the literature. For this purpose, fungal growth was investigated under different environmental conditions on earth-based material with or without the addition of straw or hemp shiv. Samples were inoculated with a strain of Aspergillus brasiliensis and were incubated for 12 weeks at 76, 84 or 93% RH, and 30 °C or 20 °C. Reproducible results showed that earth-based materials were more sensitive to fungi when they were enriched in plant aggregates. Fungal development was observed on earth material containing plant aggregates after 4 weeks of exposure at 93% RH and 30 °C, whereas it was observed after 8 weeks on raw earth material under the same conditions. Additionally, the possibility of quantifying fungal development with increased sensitivity by using image analysis is proposed. Due to the growth of fungal species other than A. brasiliensis, a natural inoculation approach is recommended. One of the conclusions is that liquid water is more favorable to mold growth than relative humidity alone. The addition of liquid water is thus recommended to accelerate the test.
- Published
- 2018
- Full Text
- View/download PDF
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