Abstract
Vertisols presenting kaolinite codominance or prevalence were already reported in several countries worldwide. However, the literature has few studies focused on investigating the influence of this clay mineral in soil geotechnical behavior. This study aimed to carry out the characterization of Vertisols in Bahia State, Brazil, to understand the influence of physical, chemical, and mineralogical properties on their geotechnical behavior, as these soils have high natural fertility and have been used for agricultural activity, but with great risk due [...]
Highlights
Geotechnical properties of expansive soils have been investigated in several regions worldwide, mainly due to damage caused by expansion and shrinkage processes to civil construction (Chen, 1988; Driscoll and Crilly, 2000; Hakari and Puranik, 2010, 2011; Paiva et al, 2016)
This study aimed to present the results of the geotechnical properties of Vertisols in the Semiarid and the Recôncavo Baiano regions, Brazil, to improve the understanding of the influence of chemical, physical, and mineralogical properties on the expansion potential, compaction ability, cohesion, and internal friction angle of these soils
The incidence of smectites and high clay content in the soil accounted for its increased expansion potential when kaolinite prevailed in the clay fraction
Summary
Geotechnical properties of expansive soils have been investigated in several regions worldwide, mainly due to damage caused by expansion and shrinkage processes to civil construction (Chen, 1988; Driscoll and Crilly, 2000; Hakari and Puranik, 2010, 2011; Paiva et al, 2016) The potential of these soils to expand is mainly associated with the incidence of expansive clay minerals, such as smectites, in them. Vertisols in Brazil are mainly found in regions whose terrain, climate, or origin material are conducive to the genesis and conservation of expansive clay minerals, such as the Semiarid and Recôncavo Baiano regions Vertisols in these regions present highly varying granulometric properties that lead to textures ranging from medium to very clayey (Jacomine et al, 1979; Lima, 2014). In addition to soils presenting prevalence of smectite in their clay fraction, there are soils presenting codominance of smectite and kaolinite and even prevalence of kaolinite (Lima, 2014), which is a non-expansive clay mineral
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