A leaching study to investigate the characteristics of gypseous soil from Baher Al-Najaf in Iraq on samples taken from three sites with different gypsum contents was performed in this work. The combination between X-ray fluorescence and scanning electron microscopy (SEM) analysis has been used to study the changes in surface matrix, chemical composition due to reaction between minerals of soil-gypsum and micro-fabrics of soils with gypsum. The solubility of gypsum minerals was found to be directly proportional to gypsum content and leaching period. An SEM analysis has shown an increase in the total change of voids and cavities for higher gypsum soils. In addition, increase in the formation of weaker binding between the sand particles was noticed due to presence of the non leached gypsum crystals in the soil structure that were identified as fibres and crusts covering the soil particles.
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Fattah et al. (2019) studied this question.
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