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Thermophysical Characterization of Local Materials from a Locality in Chad for Use in Eco-Building

Open Journal of Civil Engineering 2024年第3期14卷 486-497页

作者： Abderahman Adoum Oumar Malloum Soultan Abdallah Dadi togdjim jonas Mahamat Saleh Abdel-Khadir Mahamoud Youssouf Khayal Salif Gaye Laboratoire de Recherche en Energétique et Matériaux (LREM) de l’INSTA Institut National Supérieur des Sciences et Techniques d’Abéché Abéché Chad Ecole Doctorale Science Technique et Environnement Université de N’Djamena N’Djamena Tchad Laboratoire CABET (Construction Alternative Basse Energie au Tchad) N’Djamena Chad Laboratoire de Matériaux d’Énergétique d’Électricité et d’Économie (LM3E) Université Iba Der Thiam de Thiès Thiès Sénégal

With the aim of enhancing the value of local building materials, the subject of this paper is a thermophysical study of natural Chadian clay from the eastern region of Chad, “Abeche”. Samples were taken from a brickwork in Abeche from a depth of 1 m, then using a clay brick-making press, 4 × 5 × 8 cm 3 clay test tubes were made with 2%, 4%, 6% and 8% cow dung, and a 100% clay sample was used as a control. These samples underwent thermophysical characterization using the hot-wire method with a hot-plane option, yielding results that could improve thermophysical performance. The thermal conductivity of the test sample is in the order of 0.715 to 0.420 W/m. K, at 8% for cow dung, so the addition of cow dung as a percentage in the clay matrix enabled us to obtain various satisfactory thermal parameters.

关键词： Soils Characterization Thermophysical Local Building

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Hygrothermal Properties of a Composite Based on Clay Soils and Diatomite

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Open Journal of Civil Engineering 2024年第3期14卷 363-373页

作者： togdjim jonas Malloum Soultan Modjinguem F. Ronelngar Mahamat S. Abdel-Khadir Alexis M. Nanimina Michel Querry Mechanical Engineering Department Higher National Institute of Sciences and Techniques of Abéché Abéché Chad Technology Department University of N’Djamena N’Djamena Chad National Center for Development Research (CNRD) N’Djamena Chad Mechanical Department National Institute Superior of Sciences Appliqued Lyon France

The purpose of this paper is to make a contribution to the use of diatomite as a mineral additive in the composition of compressed earth blocks. The aim is to study the influence of diatomite on the hygrothermal behaviour of composites based on clay soils. For this reason, two clay soils with different physicochemical and mineralogical compositions were incorporated with diatomite at percentages ranging from 5% to 50% with a step of 5 to produce compressed earth blocks. After assessing the hydric and thermal characteristics of the composites, it was found that the incorporation of diatomite into the clay matrix favours the absorption of water by capillary action for all the composites. The diatomite-amended blocks subjected to the rain erosion test were less eroded than the unamended blocks. In addition, BYD composites were found to be more resistant than BTD composites, due to the high percentage of clay in T soil. The thermal conductivity of the latter decreases respectively from 0.72 to 0.29 W/m∙K for BTD composites and from 0.52 to 0.21 W/m∙K for BYD composites. This reduction proves the thermal insulating properties of diatomite. Despite the high capillary absorption capacity of these composites, they have good thermal properties, enabling them to be used in the construction of buildings for improved indoor thermal comfort.

关键词： Clay Soil Diatomite Capillary Absorption Erodibility and Thermal Conductivity

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Analysis of Fatigue and Microhardness in Metallic Powder Mixed EDM

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Open Journal of Applied Sciences 2020年第10期10卷 613-624页

作者： Alexis Mouangué Nanimina Nandiguim Lamaï Djimako Bongo togdjim jonas Bonaventure Danoumbé Ahmad Majdi Abdul-Rani Mechanical Engineering Department Higher National Institute of Sciences and Techniques of Abéché (INSTA) Abéché Ouaddai Chad Higher Normal School of Technology of Sarh Moyen-Chari Chad Mechanical Engineering Department Universiti Teknologi PETRONAS (UTP) Perak Darul Ridzuan Malaysia

The objective of this work research is to investigate the potential of using metallic powder mixed with electrical discharge machining (EDM) dielectric when machining hard electrically conductive materials. Nowadays, the development of industries requires hard materials for various applications. Machining the hard materials using the traditional processes lead to tool break and poor machined product. Even when the conventional EDM can machine hard material as long as it is electrically conductive materials, the machined parts still present drawbacks. Metallic powder mixed with EDM dielectric (PMEDM) was hypothesized to improve the machined part. The presence of metallic powder ensures uniform distribution of spark and the electrical density of the spark decreases which reduces craters, cracks and voids on machined surface. The transfer and deposit of alloying elements during powder mixed electrical discharge machining improve the machined surface properties particularly micro-hardness and fatigue. Discharge current (IP), gap voltage (GapV), ON-time (ON) and aluminum powder are selected as machined variable parameters and the output responses are fatigue performance, micro-hardness and surface topography. The workpiece material selected is molybdenum high speed steel. Micro-hardness was determined using micro-hardness tester device. The fatigue performance was determined using empirical equation. Analysis of material transfer was done using energy dispersive spectroscopy (EDS) attached to FESEM. EDS analysis involves the generation of an X-ray spectrum from the entire scan area of the SEM. The use of PMEDM improved the fatigue, the micro-harnes

关键词： PMEDM Fatigue Micro-Hardness Discharge Current Gap Voltage ON-Time

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