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Thermal Performance Analysis of Plaster Reinforced with Raffia Vinifera Particles for Use as Insulating Materials in Building

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Journal of Minerals and Materials Characterization and Engineering 2024年第2期12卷 112-138页

作者： Etienne Malbila Danielle Manuella Djouego Tagne Bouto Kossi Imbga Lareba Adelaide Ouedraogo Sié Kam david Yemboini Kader toguyeni Ecole Supé rieure d&#8217Ing&#233nierie (ESI) Universit&#233 de Fada N&#8217Gourma Fada N&#8217Gourma Burkina Faso Laboratoire d’ Energies Thermiques Renouvelables (LETRE) Universit&#233 Joseph KI-ZERBO Ouagadougou Burkina Faso Institut Supé rieur des Techniques Industrielles et Commerciales (ISTIC) Bangangt&#233 Cameroun Unité de Formation et de Recherche en Sciences et Technologies (UFR/ST) Université Norbert ZONGO Koudougou Burkina Faso Laboratoire de Physique et Chimie de l’ Environnemen (LPCE) Universit&#233 Joseph KI-ZERBO Ouagadougou Burkina Faso Ecole Polytechnique de Ouagadougou (EPO) Ouagadougou Burkina Faso

The present study focuses on the formulation of new composite consisting of plaster and raffia vinifera particle (RVP) with the purpose to reducing energy consumption. The aim of this study is to test this new compound as an insulating eco-material in building in a tropical climate. The composites samples were developed by mixing plaster with raffia vinifera particles (RVP) using three different sizes (1.6 mm, 2.5 mm and 4 mm). The effects of four different RVP incorporations rates (i.e., 0wt%, 5wt%;10wt%;15wt%) on physical, thermal, mechanicals properties of the composites were investigated. In addition, the use of the raffia vinifera particles and plaster based composite material as building envelopes thermal insulation material is studied by the habitable cell thermal behavior instrumentation. The results indicate that the incorporation of raffia vinifera particle leads to improve the new composite physical, mechanical and thermal properties. And the parametric analysis reveals that the sampling rate and the size of raffia vinifera particles are the most decisive factor to impact these properties, and to decreases in the thermal conductivity which leads to an improvement to the thermal resistance and energy savings. The best improvement of plaster composite was obtained at the raffia vinifera particles size between 2.5 and 4.0 mm loading of 5wt% (C95P5R) with a good ratio of thermo-physical-mechanical properties. Additionally, the habitable cell experimental thermal behavior, with the new raffia vinifera particles and plaster-based composite as thermal insulating material for building walls, gives an average damping of 4°C and 5.8°C in the insulated house interior environment respectively for cold and hot cases compared to the outside environment and the uninsulated house interior environment. The current study highlights that this mixture gives the new composite thermal insulation properties applicable in the eco-construction of habitats in tropical environments

关键词： Fibres Plaster Thermal Test Mechanical Test Insulating Material Indoor Comfort

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Thermal Performance Analysis of Plaster Reinforced with Raffia Vinifera Particles for Use as Insulating Materials in Building

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Journal of Minerals and Materials Characterization and Engineering（矿物质和材料特性和工程） 2024年第2期 112页

作者： Etienne Malbila Danielle Manuella Djouego Tagne Bouto Kossi Imbga Lareba Adelaide Ouedraogo SiéKam david Yemboini Kader toguyeni

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Parametric Study by Dynamic Simulation of the Influence of the Air Infiltration Rate and the Convective Thermal Transfer Coefficient on the Thermal Behavior of Residential Buildings Built with Cut Lateritic Blocks

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Journal of Energy and Power Engineering 2018年第4期12卷 177-185页

作者： david Yemboini Kader toguyeni Etienne Malbila Laboratory of Physics and Chemistry of the Environment（LPCE） University Ouaga1-Pr JKZ-UFR/SEA-03 BP 7021 OuagadougouBurkina Faso Laboratory of Thermal and Renewable Energy（LETRE） University Ouaga1-Pr JKZ-UFR/SEA-03 BP 7021 OuagadougouBurkina Faso

Sustainable building design in dry tropical areas recommends reducing exposure of buildings to solar radiation and/or designing efficient enclosures with satisfactory thermal *** propose in this paper a study of the influence of the infiltration rate in the building and the coefficient of thermal transfer by convection of the walls, on the thermal comfort using TRNSYS software. All the models carried out were validated by recognized scientific criteria, namely correlation （R） and determination （R2） coefficients on the one hand and NBME and CVRMSE coefficients defined by ASHARE, 2002 on the other hand. The results obtained indicate that the modulation of the air infiltration rate allows the simulations on TRNSYS to be compared to in-situ measurements, with an annual average relative difference of 2.86% on the temperature difference. Furthermore, depending on the parameterization of the heat transfer coefficients by convection of the internal and external walls of walls used in the STD, the average annual difference can be reduced by 1% to 4% between the predictions and the measurements.

关键词： Cut lateritic blocks dynamic thermal simulation air infiltration thermal transfer coefficient by convection thermalbehavior.

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Analysis of the Modes of Vibration and Static Resistance of the Frame of a Stirred Tank

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Journal of Energy and Power Engineering 2014年第1期8卷 85-93页

作者： david Yemboini Kader toguyeni Stanislas Sanfo Fati Zoma Laboratory of Physics and Chemistry of the Environment (ECPA) University of Ouagadougou Ouagadougou 03 BP 7021 BurkinaFaso

The present study focuses on the design and choice of materials （steels S355 and 45SCD6） of a chassis of stirred tank （with a variable filling rate） for use in the manufacturing of cosmetic products. This tank or trough will be submitted to important mechanical and thermal loads and pressure according to the various manufacturing processes. The authors propose a model of thermal and mechanical loads which takes into account the operating conditions of the tank. The analysis of the first 10 modes of vibration of the frame shows that the frequencies are much higher when the filling rate is high. They are higher for steel 45SCD6 than for the $355. The simulation results show that for a selected type of steel, the equivalent Von Mises stress increases along with increase in fill rates and thermal gradient. It appears that the influence of the thermal gradient is predominant. For both steels, the Von Mises equivalent stress is maximum in the beam 32 when the thermal gradient is at its lowest stage, and in the beam 40 for the greatest thermal gradient.

关键词： Static strength vibrations chassis stirred tank buckling of beams.

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Eco Insulation Materials： Reduction of Cooling Loads of a House Made of Breeze Block or Laterite in a Dry Tropical Climate

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Journal of Energy and Power Engineering 2014年第7期8卷 1246-1250页

作者： Ousmane Coulibaly david Yemboini Kader toguyeni LPCE (Laboratoire de Physique et de Chimie de l 'Environnement) UO-UFR/SEA (Universite de Ouagadougou Unite de Formation et Recherche en Sciences Exactes et Appliquees) Ouagadougou 03 BP 7021 Burkina Faso

In this paper, we study the influence ofeco materials for roof insulation and fiber-reinforced mortar coatings on cooling loads of a home in dry tropical climate. The walls of the house are made of cinderblock or laterite and the insulating material of a roof panel is made with lime （24%）, cement （6%）, water （50%） of vegetable fibers hibiscus sabdariffa （16%）, tree widespread in Burkina Faso and sugar cane bagasse （4%）. This panel roof insulation and the fiber-reinforced mortar were characterized at the Laboratory of Physics and Chemistry of the environment by the hot plate method. The building is modeled in TRNSYS using climate data from the city of Ouagadougou. The results obtained show that in the warmer months of the year, that is to say in March and April, the relative differences between heat gains the configurations ＂breeze block-coating mortar and roof not insulated＂ and ＂laterite- fiber-reinforced mortar coating and insulated roof＇ vary between 15.6% and 16.8%. The configuration ＂laterite-fiber-reinforced mortar coating and insulated roof allows a reduction of annual heat gains of 15.5% compared to the configuration ＂breeze block-coating mortar and roof not insulated＂.

关键词： Hot-plate approach laterite fiber-reinforced mortar TRNSYS model cooling load.

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An Experimental Study on the Use of Fonio Straw and Shea Butter Residue for Improving the Thermophysical and Mechanical Properties of Compressed Earth Blocks

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Journal of Minerals and Materials Characterization and Engineering 2020年第3期8卷 107-132页

作者： Etienne Malbila Simon Delvoie david toguyeni Shady Attia Luc Courard Laboratory of Thermal and Renewable Energy (LETRE) University Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratory of Physics and Chemistry of the Environment (LPCE) University Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratory of Building Materials (LMC) University of Liège Liège Belgium Sustainable Building Design Lab (SDB Lab) University of Liège Liège Belgium

The efficient use of building materials is one of the responses to increasing urbanization and building energy consumption. Soil as a building material has been used for several thousand years due to its availability and its usual properties improving and stabilization techniques used. Thus, fonio straws and shea butter residues are incorporated into tow soil matrix. The objective of this study is to develop a construction eco-material by recycling agricultural and biopolymer by-products in compressed earth blocks (CEB) stabilization and analyze these by-products’ influence on CEB usual properties. To do this, compressed stabilized earth blocks (CSEB) composed of clay and varying proportion (3% to 10%) of fonio straw and shea butter residue incorporated were subjected to thermophysical, flexural, compressive, and durability tests. The results obtained show that the addition of fonio straw and shea butter residues as stabilizers improves compressed stabilized earth blocks thermophysical and mechanical performance and durability. Two different clay materials were studied. Indeed, for these CEB incorporating 3% fonio straw and 3% - 10% shea butter residue, the average compressive strength and three-point bending strength values after 28 days old are respectively 3.478 MPa and 1.062 MPa. In terms of CSEB thermal properties, the average thermal conductivity is 0.549 W/m·K with 3% fonio straw and from 0.667 to 0.798 W/m. K is with 3% - 10% shea butter residue and the average thermal diffusivity is 1.665.10-7 m2/s with 3% FF and 2.24.10-7 m2/s with 3.055.10-7 m2/s with 3% - 10% shea butter residue, while the average specific heat mass is between 1.508 and 1.584 kJ/kg·K. In addition, the shea butter residue incorporated at 3% - 10% improves CSEB water repellency, with capillary coefficient values between 31 and 68 [g/m2·s]1/2 and a contact angle between 43.63°C and 86.4°C. Analysis of the results shows that, it is possible to use these CSEB for single-storey housing constru

关键词： Fonio Straw Shea Butter Residue Stabilization Compressed Stabilized Earth Blocks Thermophysical and Mechanical Properties

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Study of the Influence of a Young Synthetic Leachate on the Hydromechanical Properties of a Swelling Clay

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Journal of Environmental Science and Engineering(B) 2017年第11期6卷 569-581页

作者： Hamma Fabien Yonli david Yemboini Kader toguyeni Moussa Sougoti Department of Physics the University Ouaga I Pr Joseph KI-ZERBO BP 7021 Ouagadougou 03 Burkina Faso Department of Civil Engineering the University of Fada N'Gourma BP 46 Fada N'Gourma Burkina Faso

Despite the developments of sectors which aim at valorizing recyclable materials, landfills remain essential in integrated waste management. The construction of such infrastructures is an engineering challenge that must be proven over the long term. The purpose of this study is to understand the modification of the hydromechanical properties of bottom liners of landfills that may occur during their exploitation under leachate action. To do so, on the basis of its parameters of nature, a swelling clay from Burkina Faso is selected from soils of seven localities in Burkina Faso （West Africa）. Laboratory tests carried out with distilled water and then with a young synthetic leachate show a degradation of the permeability of this clay from 2.42 × 10^-10 m/s to 1.01 × 10^-9 m/s. In addition, leachate leads to an inhibition of the swelling and a remarkable increase of its compressibility, inducing significant settlement. With the increase in permeability, the primary consolidation settlement is increasing faster. Changes in the hydromechanical behavior can be attributed to the clays mineralogy, mainly cation exchange and the development of the diffuse double layer.

关键词： Bottom liner leachate hydraulic conductivity compressibility consolidation.

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Thermal Effect of Braking on Pavements during Heat Waves in Ouagadougou

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Materials Sciences and Applications 2023年第7期14卷 382-396页

作者： Sidpouita Mathilde Koudougou Hamma Fabien Yonli Moussa Sougoti david Yemboini Kader toguyeni Institut du Génie des Systèmes Industriels de Textiles Ecole Polytechnique de Ouagadougou Ouagadougou Burkina Faso Laboratoire de Physique et de Chimie de l’Environnement Ouagadougou Burkina Faso Université de Fada N’Gourma Fada N’Gourma Burkina Faso Université Joseph Ki-Zerbo Ouagadougou Burkina Faso

Flexible pavements, whose surface layers are made from hot mix asphalt, may show rutting in some of these infrastructures during the first months of life. In the city of Ouagadougou, this rutting phenomenon is sometimes observed. The objective of this article is to quantify the thermal response of the wearing course of national roads 1 and 2, when they are subjected to the braking of heavy trucks of 13 tons and 20 tons per axle. The meteorological conditions retained are those of the Burkinabe climate. The evaluation of the temperature was carried out by numerical simulation using the Comsol Multiphysics 5.2 software. This study showed that the thermal response of the pavement to the combined effects of surface temperature, overloading by a 20 tons heavy truck and braking during a heat wave increase in pavement surface temperature ranging from 1.09% for National Road 1 to 0.91% for National Road 2, particularly in the braking zone. This made it possible to establish the diagnosis according to which the nature of the bitumen used on the wearing course can reduce rigidity modulus. In predictive terms, they allowed us to deduce that an under-dimensioning of the wearing course, even if the bitumen was used is adequate.

关键词： Road Modeling Finite Elements Thermomechanical Tropical Climate

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Experimental Alternative to the Determination of the Thermal Dependence of the Complex Modulus of Asphalt Mixes in Dry Tropical Areas

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Journal of Minerals and Materials Characterization and Engineering 2022年第3期10卷 275-286页

作者： Sidpouita Mathilde Koudougou Guy Christian Tubreoumya david Yemboini Kader toguyeni Tégawendé Justin Zaida Institut de Génie des Systèmes Industrielles de Textiles Ecole Polytechnique de Ouagadougou Ouagadougou Burkina Faso Laboratoire de Physique et de Chimie de l’Environnement Ouagadougou Burkina Faso Université Joseph Ki-Zerbo Ouagadougou Burkina Faso

Current pavement design methods do not allow for the reduction of early deformation of the surface layers of bituminous pavements in the city of Ouagadougou. Weather conditions combined with traffic, particularly during heat waves, are factors. The temperature at the surface of the bituminous pavement can reach 62˚C but the complex modulus associated with this temperature is not taken into account in the design, hence the interest in proposing laws of dependence of the complex moduli is taken into account in the maximum temperatures of the pavement surface. The objective of this paper is to propose an experimental method to determine the temperature dependence of the complex moduli of asphalt mixes for temperatures between 40˚C and 70˚C. This experimental method consists of performing axial compression tests on cylindrical asphalt specimens. It was applied to three different formulas of bituminous mixes, intended for the wearing course, obtained from mixes of crushed granites, granular classes 6/10, 4/6 and 0/4, pure bitumens of grade 50/70, 35/50 and modified bitumen of grade 10/65. The comparative study of the experimental results obtained with the results of a semi-empirical methodology revealed a root mean square deviation from the mean of between 6.58% and 14.8% of the norms of the complex moduli (modulus of rigidity) of the asphalt mixes for a fixed frequency of solicitations of 10 Hz. The consistency of these results with data from the literature led to the initial conclusion that asphalt mixes formulated with 35/50 and 10/65 bitumen would have better compressive strength than those formulated with 50/70 bitumen, for exposure temperatures between 40˚C and 70˚C. This experimental approach could be an alternative to the complex modulus test for determining the modulus of rigidity for design purposes under real pavement exposure conditions in the city of Ouagadougou during heat waves.

关键词： Asphalt Mix Complex Modulus Axial Compression Semi-Empirical Methodology

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Study of Time Lag in a Bioclimatic House Made of Eco Materials

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材料科学与工程（中英文B版） 2015年第7期5卷 255-262页

作者： Fati Zoma toguyeni david Yemboini Kader Abdoulaye OUEDRAOGO Jean KOULIDIATI Laboratory of Physics and Chemistry of Environment University of Ouagadougou Ouagadougou 03 BP 7021 Burkina Faso Laboratory of Thermal and Renewable Energies University of Ouagadougou Ouagadougou 03 BP 7021 Burkina Faso

This paper presents a prediction of thermal behavior of bioclimatic building by the mean of time lag. Firstly, we provided locally made materials with commonly known thermal properties. Afterwards, we conducted a simulation of a building free of internal charges on the TRNSYS 16 (Transient system simulation) platform. This simulation has focused on the collection of thermograms concerning the inside and outside surfaces (exposed to solar radiation) temperatures of walls oriented South, East, North and West on the basis of a weather file called Meteonorm. An analysis of the results was conducted which leaded to the conclusion that time lags of East oriented walls is greater than that of the other walls. Furthermore, the simulation confirms that the lower the value of thermal diffusivity is, the greater the corresponding time lag is. Finally, the results of the investigations revealed that the locally designed materials have greater time lag than that of commonly use materials, like concrete. Therefore, they consume less energy as construction materials.

关键词：生物气候建筑生态材料时间滞后时滞仿真系统热扩散系数性能预测平台建设

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