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Ex-situ and In-situ Manufacturing Procedures for Optimizing the Characteristics of a Soil Concrete Based on Lateritic Gravels and Granitic Aggregates: Application in Road Construction

International Journal of Pavement Research and Technology, ISSN: 1997-1400, Vol: 17, Issue: 1, Page: 226-239
2024
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Article Description

A methodology of in-situ mixing of soil concrete in a quarry has been proposed to guarantee the required characteristics after implementation. The manufactured soil concrete is a mixture of granitic aggregates and lateritic gravels. Geotechnical tests were used to determine the physical and compaction characteristics of the studied materials. The results obtained show that the rocks encountered in the Gamboula area are granites with good to excellent impact resistance (LAA < 45%), good wear resistance (Micro Deval < 15%), and compaction characteristics (Maximum dry density MDD = 2.29 g/cm, California bearing ratio CBR = 100%) suitable for use as a base course for T1 to T4 volume traffic. The nodular materials developed on these granitic rocks are thick (2.55 m) and present geotechnical characteristics required for use in sub-base (MDD = 2.09 g/cm, CBR = 56%). The addition of 25% of 0/31.5 granite aggregates improves the characteristics of the lateritic gravels by decreasing the plasticity index, increasing the MDD, and obtaining a CBR value > 60%. A mixing logigram of the aggregate-soil mixture with the mechanical shovel was proposed. This logigram indicates that for these materials, mixing step number 5 gives a better homogeneity of the mixture and the best geotechnical characteristics, especially the CBR. After this step, the mixtures obtained can be implemented without risk of segregation or alteration of the geotechnical characteristics of the mixture. Graphical Abstract: [Figure not available: see fulltext.]

Bibliographic Details

Arnaud Ngo’o Ze; Aloys Thierry Ndzié Mvindi; Jean Francis Lobe Bille; Willy Passy Mvindi Mvindi; Danielle Léa Mebouinz; Vincent Laurent Onana

Springer Science and Business Media LLC

Engineering

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