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Contribution to the Characterization of Lateritic Soils for the Manufacture of Compressed Stabilized Earth Bricks

Open Journal of Civil Engineering 2021年第4期11卷 411-426页

作者： Cherif Bishweka Marcelline Blanche Manjia François Ngapgue Ursula Joyce Merveilles Pettang Nana Chrispin Pettang Department of Civil Engineering Faculty of Sciences and Applied Technologies Free University of the Great Lakes Countries Congo North Kivu Goma Civil and Mechanical Engineering Laboratory Research and Postgraduate Training Unit for Engineering and Applications Science Post Graduate School for Science Technology and Geosciences University of Yaoundé I Yaoundé Cameroon Department of Civil Engineering National Advanced School of Engineering Yaoundé University of Yaoundé I Yaoundé Cameroon Fotso Victor University Institute of Technology Bandjoun University of Dschang Dschang Cameroon

The aim of this study is to contribute to the mastery of the physical characteristics of lateritic soils in order to improve their use for the manufacture of Compressed Stabilized Earth Bricks (CSEB) in the province of North Kivu in the Democratic Republic of Congo (DRC). The study of the physical characteristics of lateritic soils was carried out. Samples were subjected to experimental identification tests on the physical characteristics (water content, density characteristics, particle size distribution and consistency). The results of the laboratory analysis of soil samples show that the water content varies between 5.4% and 36.99%. The density of the solid grains has an arithmetic mean of 2.5 g/cm3. The apparent density varies from 0.83 to 1.35 g/cm3. As for the dry density, it is in the range of 0.61 to 1.25 g/cm3. These relatively low densities indicate that the material studied has a significant degree of deformability. From the particle size analysis, it appears that the material studied contains an important fraction of fine particles. According to the consistency study, the soils studied are plastic clay as Ap class according to the Central Laboratory for Roads and Bridges (CLRB) ge

关键词： Lateritic Soils identification tests Characterization Classification Earth Construction

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Precious Metals identification in Computer Motherboards

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材料科学与工程（中英文A版） 2023年第2期13卷 43-47页

作者： Hebah Abdel-Wahab Tamara Gund Science Technology Engineering&Mathematics Devision Middlesex County CollegeEdison 08818New JerseyUnited States Department of Chemistry and Environmental Science New Jersey Institute of TechnologyNewark 07102New JerseyUnited States

Elements can be classified into metals,nonmetals,or metalloids based on their chemical and physical *** metals are rare and *** are ten known precious metals,three of which are of interest to investors,silver,gold,and *** goal is to find physical methods to identify the presence of precious metals,silver,and gold in the metal components of the computer motherboard,and to confirm its presence by chemical methods for its use and its selling to the jewelry industry after it is physically separated from the computer *** and chemical tests were *** tests include inscription test,magnet test and specific gravity test for both silver and gold metal pieces and chemical tests include bleach test,nitric acid test,test karat solution kit,and jewelry test kits.

关键词： Precious metals gold silver identification tests computer motherboards

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