A new temperature controlled triaxial apparatus

Cekerevac, C.; Laloui, L.; Vulliet, L.

doi:10.1201/noe9058096043.ch18

Cited by 5 publications

(2 citation statements)

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“…These data (Figure 12) complement the permeability data ( Figure 11) and suggest that a general contraction of the bentonite may be occurring. Other studies have investigated the effect of consolidation on saturated soils, finding that low over-consolidation causes contraction whilst high over-consolidation causes expansion up to a specific temperature, followed by contraction for temperatures above this point (fractionated illitic material and glacial lake clay, normally consolidated [50]; low porosity clay [51], MC clay (similar to Kaolin) and bentonite [52]; Boom Clay, Pasquasia Clay and Spanish Clay [53]; Boom Clay [54]; Kaolin [55]). The thermal history of the bentonite in a repository could therefore have an important effect on its operational performance.…”

Section: Discussionmentioning

confidence: 99%

Bentonite Permeability at Elevated Temperature

et al. 2017

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Repository designs frequently favour geological disposal of radioactive waste with a backfill material occupying void space around the waste. The backfill material must tolerate the high temperatures produced by decaying radioactive waste to prevent its failure or degradation, leading to increased hydraulic conductivity and reduced sealing performance. The results of four experiments investigating the effect of temperature on the permeability of a bentonite backfill are presented. Bentonite is a clay commonly proposed as the backfill in repository designs because of its high swelling capacity and very low permeability. The experiments were conducted in two sets of purpose-built, temperature controlled apparatus, designed to simulate isotropic pressure and constant volume conditions within the testing range of 4-6 MPa average effective stress. The response of bentonite during thermal loading at temperatures up to 200 • C was investigated, extending the previously considered temperature range. The results provide details of bentonite's intrinsic permeability, total stress, swelling pressure and porewater pressure during thermal cycles. We find that bentonite's hydraulic properties are sensitive to thermal loading and the type of imposed boundary condition. However, the permeability change is not large and can mostly be accounted for by water viscosity changes. Thus, under 150 • C, temperature has a minimal impact on bentonite's hydraulic permeability.

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Section: Discussionmentioning

confidence: 99%

Bentonite Permeability at Elevated Temperature

et al. 2017

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“…Reports mentioned above, Alonso et al (1990) [6] organized a fundamental theory for unsaturated constitutive framework that was possible to verify suction effect. Beyond constitutive model suggested by Alonso et al (1990) [6], a few studies have been developed the models based on modified Cam-clay model, and Cekerevac et al (2003) [7] and Cekerevac et al (2004) [8] indicated the influence of thermal effort to clay material.…”

Section: Swelling Pressure Under Various Suctionmentioning

confidence: 99%

Swelling pressure of a sodium bentonite in solutions of different suction

2021

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In this study, the swelling pressure of unsaturated, compacted bentonite-sand mixture was measured, which the all samples had experiment in dying-wetting history in suction changing. This test program used Kunigel V1 as sodium type. Constant volume swelling test was conducted out that swelling pressure was measured using a developed apparatus. A pressure sensor was mounted in the swelling test apparatus. Previously, the all samples deformed due to suction change (i.e. drying-wetting process in suction). Two types were prepared before applying suction that were initial unsaturated condition and saturated condition on same initial dry density. Swelling pressure and adsorbed water amount was monitored in the test, which lasted for one month.

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New thermal triaxial apparatus for unsaturated soils using the osmotic method

Ghembaza¹,

Taïbi²,

Fleureau³

2014

Arab J Geosci

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International audienceThe study of the temperature effects on the behaviour of saturated and unsaturated soils on triaxial paths requires the development of a new triaxial experimental device of 3.5 MPa of confining pressure and equipped with a heating collar-controlled temperature. In addition to this case of the unsaturated soils, a special pedestal is developed, so as to impose suctions up to 9 MPa using an osmotic solution of polyethylene glycol (PEG) 6000 through a permeable semi-membrane. Measurements of the degree of saturation and the variation of volume during tests induce various problems, primarily related to the thermal dilation of the osmotic solution and the cell-water system. These problems have been solved by carrying out a preliminary calibration. The applicability of this new apparatus concerns environmental geotechnics and geological engineering such as the design and behaviour of engineered barriers as well as the behaviour of the receiving layers of storage sites like radioactive waste

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A new temperature controlled triaxial apparatus

Cited by 5 publications

References 0 publications

Bentonite Permeability at Elevated Temperature

Bentonite Permeability at Elevated Temperature

Swelling pressure of a sodium bentonite in solutions of different suction

New thermal triaxial apparatus for unsaturated soils using the osmotic method

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