Experimental study on the swelling behaviour of bentonite/claystone mixture

Wang, Qiong; Tang, Anh Minh; Cui, Yu‐Jun; Delage, Pierre; Gatmiri, Behrouz

doi:10.1016/j.enggeo.2011.10.003

Cited by 198 publications

(85 citation statements)

References 49 publications

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“…14 clearly distinguish the two groups in terms of swelling stress σ s . In addition, a unique correlation between e i and σ s may be expected with normalisation by mineralogy, like the normalisation by dry density of bentonite in the case of bentonite mixtures (Dixon et al, 1996;Lee et al, 1999;Agus, 2005;Wang et al, 2012). Unfortunately, the discrepancy in mineralogical composition (Vandenberghe, 2011) and physical properties mentioned above does not allow this normalisation in the present study.…”

Section: Swelling Capacitycontrasting

confidence: 49%

Physical and microstructural impacts on the hydro-mechanical behaviour of Ypresian clays

Nguyen¹,

Cui²,

Tang³

et al. 2014

Applied Clay Science

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International audienceAn experimental characterisation on Ypresian clays that are considered as one of the potential geological host formations for the radioactive waste disposal in Belgium has been carried out. Physical, microstructural, hydraulic and mechanical properties were investigated on the samples taken from a cored borehole at Kallo in the Northern Belgium at 290-400 m depth. Identification tests, scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP) and oedometer tests were performed. The results obtained showed that Ypresian clays are highly plastic (large values of consistence limits, specific surface, blue ethylene value) and of relatively low density, in relation to their high swelling clay content. In addition, their physical and mineralogical properties present significant variations over depth. Two microstructural arrangements, matrix-type and aggregate-type respectively for the depths with higher and lower swelling content, were identified. The former exhibits bi-modal porosity while the latter shows a common deep sediment mono-modal porosity but with a larger dominant pore size. The permeability of the clays with matrix-type microstructure is significantly lower than that with aggregate-type despite their higher void ratio. Moreover, these microstructural features result in the initial unsaturated state of Ypresian clays sample. Typical hysteretic unloading-reloading loops are identified on both low- and high-pressure oedometer tests that can be explained by a microstructure-based swelling stress concept. The variation of this swelling stress with the corresponding initial void ratio over depth perfectly reflects the physical variations and is consistent with that of swelling stress determined from common swelling tests. The yield stress ratios are slightly higher than the over-consolidation ratio, suggesting negligible effects of diagenesis, cambering and valley bulging etc. The variations of compression index, compression and swelling slopes are consistent with the physical and microstructural variations

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Section: Swelling Capacitycontrasting

confidence: 49%

Physical and microstructural impacts on the hydro-mechanical behaviour of Ypresian clays

Nguyen¹,

Cui²,

Tang³

et al. 2014

Applied Clay Science

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“…Figure 5 [3,[37][38][39][40][41][42][43][44][45] and Fig. 6 [3,37,[39][40][41][42][43][46][47][48][49][50][51][52][53][54][55][56][57][58][59] show the variations of individual swelling parameters S and S p with MC, respectively. In general, it can be observed from the trends that both S and S p vary linearly with MC.…”

Section: Resultsmentioning

confidence: 99%

Mineralogical Compositions of Some Indian Expansive Soils and Their Influence on Swelling Properties

Tahasildar

Rao

Shukla

2017

Int. J. of Geosynth. and Ground Eng.

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“…Recent literature (e.g. [8,23,30,47]) has focused in particular on the effect of fabric/structure evolution of compacted/aggregated clayey soils during generalised hydro-mechanical paths. As a result of this research, recent models describing the water retention of compacted soils (e.g.…”

Section: Introductionmentioning

confidence: 99%

A study of the water retention curve of lime-treated London Clay

2016

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This paper investigates the drying and wetting soil water retention curves (SWRCs) of statically compacted lime-stabilised London Clay specimens. A series of tests were performed using the contact filter paper method, pressure plate apparatus and a suction-controlled triaxial system incorporating the axis translation technique. These investigated the water retention of the soil under different boundary and stress-state conditions and simultaneously determined the volume change in the soil during drying and wetting. Factors relevant to the lime treatment of soils, such as curing period and method (air vs. water curing), were also considered. Finally, the hysteresis of the SWRC of the chemically treated soil (for which there appears to be a lack of information in the international literature) was investigated. The results showed that the treatment with lime increased the volumetric stability but reduced the water retention ability due to a more open structure enabled by the flocculation and chemical bonding effects. Curing period and method effect appears to be small. Hysteresis was noted to some degree in all instances.

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Experimental study on the swelling behaviour of bentonite/claystone mixture

Cited by 198 publications

References 49 publications

Physical and microstructural impacts on the hydro-mechanical behaviour of Ypresian clays

Physical and microstructural impacts on the hydro-mechanical behaviour of Ypresian clays

Mineralogical Compositions of Some Indian Expansive Soils and Their Influence on Swelling Properties

A study of the water retention curve of lime-treated London Clay

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