Determining the Effect of Wood Sawdust and Sand on the Compressive Strength and Water Absorption of Clay Pavers | Chapter 11 | Novel Perspectives of Engineering Research Vol. 4

 The purpose of this research is to see how wood sawdust and sand affect clay paver compressive strength and water absorption. The authors mixed cement-stabilized clay with sawdust from various woods (limba or kambala) and various sands to make paving bricks in this study (white or crushed). X-ray diffraction was used to analyse the mineralogical composition of the clay raw material, which revealed that the phyllite fraction is primarily composed of 95 percent kaolinite and 5% smectite and/or chlorite/smectite interstratified. The compressive strengths of the mixtures "clay stabilised with 4 percent cement mixed with 4 percent kambala sawdust and 5 percent white sand" and "clay stabilised with 4 percent cement mixed with 4 percent limba sawdust and 5 percent crushed sand" were found to be higher. The water absorption rate of the paving bricks ranged from 18.1 to 20.4 percent.

Author(S) Details

Hilaire Elenga
Faculté des Sciences et Techniques, Université Marien Ngouabi, BP 69, Brazzaville, Congo and Centre de Recherches Géologiques et Minières (CRGM), BP 14520 Brazzaville, Congo.

Ferland Ngoro-Elenga
Faculté des Sciences et Techniques, Université Marien Ngouabi, BP 69, Brazzaville, Congo and Centre de Recherches Géologiques et Minières (CRGM), BP 14520 Brazzaville, Congo and Groupe de Recherches sur les Propriétés Physico-chimiques et Minéralogiques des Matériaux, Université Marien Ngouabi, BP 69, Brazzaville, Congo.

Jude Nogelvi Ngakosso Ngolo
Faculté des Sciences et Techniques, Université Marien Ngouabi, BP 69, Brazzaville, Congo and Centre de Recherches Géologiques et Minières (CRGM), BP 14520 Brazzaville, Congo and Groupe de Recherches sur les Propriétés Physico-chimiques et Minéralogiques des Matériaux, Université Marien Ngouabi, BP 69, Brazzaville, Congo.

Timothée Nsongo
Faculté des Sciences et Techniques, Université Marien Ngouabi, BP 69, Brazzaville, Congo and Centre de Recherches Géologiques et Minières (CRGM), BP 14520 Brazzaville, Congo and Groupe de Recherches sur les Propriétés Physico-chimiques et Minéralogiques des Matériaux, Université Marien Ngouabi, BP 69, Brazzaville, Congo.

Thomas Tamo Tatietsé
National Advanced School of Engineering, University of Yaoundé 1, Yaoundé, Cameroon.

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Study on Absolute Hardness of Thin Films by Monolayer Model Application | Chapter 10 | Novel Perspectives of Engineering Research Vol. 4

 To determine the absolute hardness of a film or coating, the contribution of the substrate must be separated. It is well known that the film thickness and the applied load are the two most important factors in determining the absolute hardness of a film in this circumstance. The contributions of the substrate and the film are reflected in the apparent hardness values derived from indentation measurements. These two components must be separated in order to ascertain the true hardness of the film. Several writers have worked on this problem over the years, and the literature contains a huge number of models developed using an additive linear function. The goal of this study is to measure the absolute hardness of nitride thin layers created by two different plasma activation rates of 50% and 65 percent. A series of traditional Vickers indentation was done to the objects' surfaces at varied loads. Because the separation of substrate contribution to film measurement hardness reported in the literature is very complicated due to several parameters that intervene, we used the Jonsson- Hogmark model (J-H) in this study, which is simple and gives the best results according to several previous studies.

Author(S) Details

Younès Benarioua
Department of Mechanical Engineering, Faculty of Technology, University of M'sila; Bordj Bou Arreridj Road; M’sila-28000; Algeria.

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