Effect of shrinkage on water retention characteristics of bentonite and its influence on WRCC parameterization
By: Abhijit, D
.
Contributor(s): Gupt, Chandra B.
Publisher: USA Springer 2023Edition: Vol.53(3), Jun.Description: 548-561p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian geotechnical journalSummary: Unsaturated characterization of expansive soil like bentonite has been a tedious task for the researchers to give a correct and reliable relationship between suction and water content due to its high sensitive property of volume change. The studies reported in the literature to an extent have circumvented the influence of volume change on water retention characteristics by reporting the results in terms of gravimetric water content. However, most of the field applications and complex mathematical formulations require Water Retention Characteristics Curve (WRCC) to be represented in terms of volumetric water content. In this work, four types of commercially available bentonite with varying degrees of plasticity were chosen and the effect of volume change on WRCC was studied in detail. Continuous measurements of volume change and suction of bentonites were made and a suitable methodology for selecting the appropriate range of suction data for WRCC parameterization was proposed. Thus, this study recommends a mandatory approach for determining the WRCC model parameters unambiguously by considering the results of shrinkage characteristics and suction data. A robust method was finally proposed for determining volumetric shrinkage curves for bentonite. The results of WRCC parameterization clearly highlight the difference in model parameters with and without the use of shrinkage test results. Based on the present work, a new framework for WRCC parameterization of high volume change soils like bentonite was suggested to overcome the possibilities of multiple initial volumetric water content depending on users and results in unique WRCC parameters for high volume change soils like bentonite.
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2023-1208 |
Unsaturated characterization of expansive soil like bentonite has been a tedious task for the researchers to give a correct and reliable relationship between suction and water content due to its high sensitive property of volume change. The studies reported in the literature to an extent have circumvented the influence of volume change on water retention characteristics by reporting the results in terms of gravimetric water content. However, most of the field applications and complex mathematical formulations require Water Retention Characteristics Curve (WRCC) to be represented in terms of volumetric water content. In this work, four types of commercially available bentonite with varying degrees of plasticity were chosen and the effect of volume change on WRCC was studied in detail. Continuous measurements of volume change and suction of bentonites were made and a suitable methodology for selecting the appropriate range of suction data for WRCC parameterization was proposed. Thus, this study recommends a mandatory approach for determining the WRCC model parameters unambiguously by considering the results of shrinkage characteristics and suction data. A robust method was finally proposed for determining volumetric shrinkage curves for bentonite. The results of WRCC parameterization clearly highlight the difference in model parameters with and without the use of shrinkage test results. Based on the present work, a new framework for WRCC parameterization of high volume change soils like bentonite was suggested to overcome the possibilities of multiple initial volumetric water content depending on users and results in unique WRCC parameters for high volume change soils like bentonite.
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