Abstract
Bentonite, which is known as adsorbent expansive clay, is widely used as a nanoparticle in a variety of applications due to its unique microstructure. Analyzing the pore size distribution is crucial for studying its microstructural behavior. Drying techniques and initial moisture content play a significant role in the microstructural changes of clays. This study aimed to investigate how different drying techniques and initial moisture content influence the pore size and volume distribution of bentonite. The results indicate a correlation between drying techniques and hydraulic states with the microstructural changes observed in bentonite. Pore size distribution analysis reveals distinct differences in micro, meso, and macro-pore volumes depending on the employed drying techniques. Conventional drying methods show significant alterations in pore volume distribution for specimens prepared with moisture content from dry and wet of the compaction curve's optimum water content. Conversely, a separate phenomenon is observed for specimens subjected to direct outgassing without prior drying. It is observed that specimens undergoing outgassing at elevated temperatures exhibit almost similar pore volume distributions between dry and wet specimens. Dry specimens exhibit a higher cumulative pore volume and a greater number of macro pores compared to wet specimens when subjected to a specific drying method. Moreover, specimens subjected to outgassed freeze-drying, oven-drying, and air-drying exhibit significant changes in cumulative pore volume distribution compared to those without outgassing treatment. These findings highlight the importance of employing a standardized drying technique to accurately predict the microstructural behavior of bentonite clay and understand its pore-size distribution.
Published Version
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