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Aptitude de certains pyroclastiques nigérians à servir de matériaux de construction
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ISBN10: 6203331902
ISBN13: 9786203331905
Publisher: Editions Notre Savoir
Published: Jan 20 2025
Pages: 96
Weight: 0.31
Height: 0.23 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786203331905
Publisher: Editions Notre Savoir
Published: Jan 20 2025
Pages: 96
Weight: 0.31
Height: 0.23 Width: 6.00 Depth: 9.00
Language: French
Ce travail étudie, au moyen d'analyses géologiques et géotechniques, le potentiel des corps pyroclastiques (volcaniques) d'Abakaliki dans la métropole d'Abakaliki (sud-est du Nigeria) en tant que matériaux de construction pour divers projets d'ingénierie. L'analyse modale indique que les pyroclastiques sont des tufs à grains fins à porphyriques, avec une grande quantité de plagioclase, une masse vitreuse et des fragments lithiques schisteux, et une composition alcaline/basaltique. La comparaison avec les normes de construction indique que les pyroclastiques d'Abakaliki ont une performance marginale à assez bonne pour la plupart des objectifs de construction, tels que les pierres de construction, les pierres d'amour ou les enrochements, ainsi que le béton et les agrégats routiers; la plupart des échantillons testés ont des valeurs de paramètres géotechniques qui se situent en dehors des limites recommandées. La performance faible à marginale des agrégats pyroclastiques en laboratoire peut s'expliquer par la quantité élevée de minéraux faibles et délétères (fragments lithiques schisteux, verre volcanique et chlorite) qui subissent une détérioration matérielle au fil du temps, en particulier lorsqu'ils sont exposés à des facteurs climatiques défavorables (volume élevé de précipitations et température élevée et fluctuante), comme c'est le cas sous les tropiques.
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