Version 1
: Received: 17 November 2023 / Approved: 17 November 2023 / Online: 20 November 2023 (10:47:45 CET)
Version 2
: Received: 31 December 2023 / Approved: 2 January 2024 / Online: 2 January 2024 (07:55:29 CET)
How to cite:
Al-hadj, H.Z.; Rochette, P.; Allafouza, A.B. Petrographic and Geotechnical Study of Aggregates from the Alfallé Magmatic and Metamorphic Massif (Central Chad ). Preprints2023, 2023111189. https://doi.org/10.20944/preprints202311.1189.v1
Al-hadj, H.Z.; Rochette, P.; Allafouza, A.B. Petrographic and Geotechnical Study of Aggregates from the Alfallé Magmatic and Metamorphic Massif (Central Chad ). Preprints 2023, 2023111189. https://doi.org/10.20944/preprints202311.1189.v1
Al-hadj, H.Z.; Rochette, P.; Allafouza, A.B. Petrographic and Geotechnical Study of Aggregates from the Alfallé Magmatic and Metamorphic Massif (Central Chad ). Preprints2023, 2023111189. https://doi.org/10.20944/preprints202311.1189.v1
APA Style
Al-hadj, H.Z., Rochette, P., & Allafouza, A.B. (2023). Petrographic and Geotechnical Study of Aggregates from the Alfallé Magmatic and Metamorphic Massif (Central Chad ). Preprints. https://doi.org/10.20944/preprints202311.1189.v1
Chicago/Turabian Style
Al-hadj, H.Z., Pierre Rochette and Annour Birké Allafouza. 2023 "Petrographic and Geotechnical Study of Aggregates from the Alfallé Magmatic and Metamorphic Massif (Central Chad )" Preprints. https://doi.org/10.20944/preprints202311.1189.v1
Abstract
This study focused on aggregates from the geological formations of the Alfallé massif located approximately 75km east of the town of N'Goura, in the Hadjer-Lamis Province (13°N, 17°E). The aim of this study is to determine the petrographic and geotechnical characteristics of these aggregates with a view to their recovery. Petrographically, the massif outcrops in blocks, balls and slabs. It is made up of three types of rock: alkali feldspar megacrystalline granite, biotite mi-crogranite and biotite gneiss. Alkali feldspar megacrystalline granite is composed of quartz (30%), orthoclase (30%), plagioclase (20%), biotite (15%) and opaque minerals (≈5%). Biotite mi-crogranite is composed of quartz (15-20%), orthoclase (20-25%), plagioclase (18-25%), biotite (20-25%) and opaque minerals (≈4%). The biotite gneiss is composed of quartz (25-30%), alkali feldspars (25-27%), plagioclase (17%), biotite (25-27%) and opaque minerals (≈5%). The geotech-nical characteristics show that the aggregates studied have specific density values of between 2.58 and 2.75g/cm3 with an average value of 2.66g/cm3, bulk density of 1, 3 to 1.4g/cm3 with an av-erage value of 1.3g/cm3, a Los-Angeles coefficient of 11.2% to 28.9% with an average value of 20.1% and a wet Micro-Deval coefficient of 5.2% to 10.8% with an average value of 7.6%. The values obtained indicate that the materials studied have satisfactory properties, with the excep-tion of samples E4 and E1, which respectively show aggregates with excellent geotechnical prop-erties and materials with limited impact resistance. These results are conclusive and of scientific interest for the exploitation of an aggregates quarry.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
