A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Swelling and mineralogical characteristics of alkali-transformed kaolinitic clays
https://orcid.org/0000-0001-7901-0524
https://orcid.org/0000-0002-1763-3256
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.
Highlights Kaolinitic clays were transformed at different solid:liquid ratio using 4 N NaOH. Dissolution of kaolinite and formation of sodalites are clearly observed after the transformation phase. Swelling characteristics of transformed kaolinitic clays is studied. Swelling with water increased with increase in degree of transformation of clays. Swelling with 4 N NaOH decreased with increase in degree of transformation of clays.
Swelling and mineralogical characteristics of alkali-transformed kaolinitic clays
https://orcid.org/0000-0001-7901-0524
https://orcid.org/0000-0002-1763-3256
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.
Highlights Kaolinitic clays were transformed at different solid:liquid ratio using 4 N NaOH. Dissolution of kaolinite and formation of sodalites are clearly observed after the transformation phase. Swelling characteristics of transformed kaolinitic clays is studied. Swelling with water increased with increase in degree of transformation of clays. Swelling with 4 N NaOH decreased with increase in degree of transformation of clays.
Swelling and mineralogical characteristics of alkali-transformed kaolinitic clays
https://orcid.org/0000-0001-7901-0524
https://orcid.org/0000-0002-1763-3256
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.
Highlights Kaolinitic clays were transformed at different solid:liquid ratio using 4 N NaOH. Dissolution of kaolinite and formation of sodalites are clearly observed after the transformation phase. Swelling characteristics of transformed kaolinitic clays is studied. Swelling with water increased with increase in degree of transformation of clays. Swelling with 4 N NaOH decreased with increase in degree of transformation of clays.
Swelling and mineralogical characteristics of alkali-transformed kaolinitic clays
Sruthi, P. Lakshmi (author) / Reddy, P. Hari Prasad (author)
Applied Clay Science ; 183
2019-10-25
Article (Journal)
Electronic Resource
English
Kaolinitic clays , Alkali , XRD , FTIR , TG-DTA
Swelling behavior of kaolinitic clays contaminated with alkali solutions: A micro-level study
| Online Contents | 2016