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Effects of rice husk on adobes in clay soils

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Author Affiliations

  • 1National High School of Public Works of N’Djamena, Civil Engineering Laboratory, P.O. Box: 60 N'Djamena, Chad
  • 2Group of Mechanics, Materials and Acoustics (GMMA), Department of Physics, Faculty of Science, University of N'Gaoundéré, P.O. Box: 454 Ngaoundéré, Cameroon
  • 3Mongo Polytechnic University, Laboratory of Mechanical Engineering and Materials, P.O. Box: 4377 Mongo, Chad
  • 4National High School of Public Works of N’Djamena, Civil Engineering Laboratory, P.O. Box: 60 N'Djamena, Chad
  • 5National High School of Public Works of N’Djamena, Civil Engineering Laboratory, P.O. Box: 60 N'Djamena, Chad

Res. J. Engineering Sci., Volume 11, Issue (3), Pages 12-21, September,26 (2022)

Abstract

This work aims to evaluate the influence of rice husk on the mechanical and physical characteristics of adobes produced from clay soils. To this end, rice husk sorted by a 1.25mm diameter mesh screen was used to formulate different mixtures comprising 0%, 1%, 1.5%, 2% and 2.5% by mass of clay. The specimens with dimensions of 4cmx4cmx16cm were produced after 0, 7 and 14 days of maturation of the formulated pastes. The different adobes were tested for water absorption, drying shrinkage and mass loss as well as for mechanical characterization. The results obtained indicate that the linear shrinkage, mass loss and water absorption coefficient decrease with increasing percentages of rice husk and days of maturation. The addition of 1% rice husk to these clay soils improves the mechanical strength. This improvement is a function of the number of days of maturation of the pasta and leads to a gain of 5 to 6% in mechanical strength for the clay soil of N'Djamena.

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