Water retention characteristics of swelling clays in different compaction states

Kannan K. R Iyer, Jeevan Joseph, B. C. F. L Lopes, D. N. Singh, Alessandro Tarantino

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The soil water retention (SWR) characteristics of the clays play an important role in controlling their engineering behaviour, particularly, in the unsaturated state. Although, researchers have attempted to understand the water retention characteristics of the clays in their reconstituted or remoulded state, such studies are rare for the clays in their intact state. In this context, it becomes important to understand the influence of initial state of compaction, which would create different pore- and fabric- structure (viz., microstructure), on the water retention characteristics of the clays. With this in view, SWR behaviour was determined experimentally for the swelling clays (dried from different compaction states, viz., intact, reconstituted and remoulded) by employing Dewpoint Potentiameter (WP4C®). The changes in the pore-size distribution of the clays at different stages of drying cycle were also studied by employing the Mercury Intrusion Porosimetry. The study reveals that the SWR curves for the intact and reconstituted specimens of the clays converge beyond a certain stage of drying. Also, a critical analysis of changes in the pore structure of the swelling clay specimens, during drying, indicates that the progressively deforming pore structure play an important role in controlling its water retention characteristics to a great extent.
LanguageEnglish
Number of pages56
JournalGeomechanics and Geoengineering
Early online date6 Nov 2017
DOIs
Publication statusE-pub ahead of print - 6 Nov 2017

Fingerprint

water retention
swelling
Swelling
compaction
Clay
Compaction
clay
Water
Drying
soil water
Pore structure
Soils
critical analysis
Pore size
microstructure
engineering
Microstructure
drying

Keywords

  • swelling clays
  • state of compaction
  • soil-water retention curve
  • Dew point Potentiometer
  • microstructural studies

Cite this

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title = "Water retention characteristics of swelling clays in different compaction states",
abstract = "The soil water retention (SWR) characteristics of the clays play an important role in controlling their engineering behaviour, particularly, in the unsaturated state. Although, researchers have attempted to understand the water retention characteristics of the clays in their reconstituted or remoulded state, such studies are rare for the clays in their intact state. In this context, it becomes important to understand the influence of initial state of compaction, which would create different pore- and fabric- structure (viz., microstructure), on the water retention characteristics of the clays. With this in view, SWR behaviour was determined experimentally for the swelling clays (dried from different compaction states, viz., intact, reconstituted and remoulded) by employing Dewpoint Potentiameter (WP4C{\circledR}). The changes in the pore-size distribution of the clays at different stages of drying cycle were also studied by employing the Mercury Intrusion Porosimetry. The study reveals that the SWR curves for the intact and reconstituted specimens of the clays converge beyond a certain stage of drying. Also, a critical analysis of changes in the pore structure of the swelling clay specimens, during drying, indicates that the progressively deforming pore structure play an important role in controlling its water retention characteristics to a great extent.",
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Water retention characteristics of swelling clays in different compaction states. / Iyer, Kannan K. R; Joseph, Jeevan ; Lopes, B. C. F. L; Singh, D. N. ; Tarantino, Alessandro.

In: Geomechanics and Geoengineering, 06.11.2017.

Research output: Contribution to journalArticle

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