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NF P 11-300 (1992) Construction of Earthworks—Classification of Materials for Use in the Construction of Embankments and Subgrades of Road Infrastructure.

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• TITLE: Characterization of the Activity, Mineralogy and Correlations between the Properties of Clayey Soils

  AUTHORS: Louis Ahouet, Sorel Dzaba, Brige Dublin Boussa Elenga, Sylvain Ndinga Okina, Fabien T. Kimbatsa

  KEYWORDS: Activity, Specific Surface Area, Cation Exchange Capacity, Mineralogy, Atterberg Limit

  JOURNAL NAME: Journal of Minerals and Materials Characterization and Engineering, Vol.10 No.5, September 27, 2022

  ABSTRACT: The activity is related to the mineralogy and geological history of clays. Soils with the same value of the liquidity limit or plasticity index can have very different characteristics depending on the amount and type of clay minerals. The methylene blue value characterizes the activity of the clays and reflects the surface activity. Ten inactive soils contain minerals (kaolinite, illite), these soils absorb little water. Two swelling soils have normal activity and are composed of minerals (kaolinite, illite, Montmorillonite). The relationships between clayey soils properties, their activities and between the activity and the liquidity limit are defined. The correlations obtained are linear fit and exponential and sigmoidal fits. The correlations obtained with a coefficient of determination of R2 (0.859 - 0.999) can be used to characterize and predict certain parameters of fine-grained soils as a function of clay content.