Swelling and mineralogical characteristics of alkali-transformed kaolinitic clays
Source abstract
Abstract
Abstract This work investigates the swelling and mineralogical characteristics of alkali-transformed (partially and completely transformed) kaolinitic clays to bring out the subsequent effect of alkali contamination. One-dimensional free swell tests were conducted to determine the degree of swelling on alkali-transformed kaolinitic clays inundated with water and 4 N NaOH. Swelling increased in transformed clays with an increase in degree of transformation when inundated with water. An opposite trend was observed in the swelling patterns of alkali-transformed clays upon inundation with 4 N NaOH when compared with water i.e., swelling decreased with increase in degree of transformation upon inundation with 4 N NaOH. This was mainly attributed to mineralogical changes, which occurred in transformed clays. This was confirmed by X-ray diffraction (XRD) analysis. To further re-confirm the changes observed, Fourier transform infrared spectroscopy (FTIR), and Thermogravimetric-Differential thermal analysis (TG-DTA) techniques were carried out. Complete kaolinite mineral dissolution and neogenic formations (mainly sodalites) were the key factors for differences in swelling tendencies when inundated with water or 4 N NaOH.
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Research context
OpenAlex topics: Soil and Unsaturated Flow · Clay minerals and soil interactions · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (37)
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