Measurements of the thermal conductivity of clay-sand and clay-graphite mixtures used as engineered barriers for high-level radioactive waste disposal

Beziat, A.; Dardaine, M.; Mouche, Emmanuel

doi:10.1016/s0169-1317(09)90001-1

Cited by 20 publications

(8 citation statements)

References 4 publications

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“…3). Beziat et al (1988) concluded that the mineralogical composition was less important in modelling thermal conductivities of clays compared to water content (i.e. porosity) and density.…”

Section: Mineralogymentioning

confidence: 99%

“…The grain size and the grain size distribution are important factors controlling the texture of sedimentary rocks. These factors are assumed to influence the thermal conductivity (Anand et al 1973;Rzhevsky & Novik 1971;Brigaud et al 1990;Beziat et al 1992;Griffiths et al 1992;Jones & Pascal 1994;McKenna et al 1996;Midttømme et al 1997Midttømme et al , 1998. Rzhevsky & Novik (1971) found a decrease in thermal conductivity with decreasing grain size of the material.…”

Section: Introductionmentioning

confidence: 99%

“…In a study of unconsolidated fine-grained sediments, the >63 µm content was, excepting the water content, found to have greatest influence on the measured thermal conductivities (Midttømme et al 1997). The dependence of grain size on thermal conductivity is assumed to be related to the number of grain contacts per unit path of heat flow (McGaw 1969;Rzhevsky & Novik 1971;Beziat et al 1992;Griffiths et al 1992). The grain contact zones offer more resistance to the heat flow than do the grains themselves.…”

Section: Introductionmentioning

confidence: 99%

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The effect of grain size on thermal conductivity of quartz sands and silts

Midttømme

Roaldset²

1998

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Synthetic samples of different grain size fractions of quartz were prepared and the thermal conductivities measured with a divided bar apparatus. The measurements were carried out on dried and water-saturated samples both perpendicular and parallel to the main stress direction during compaction of the samples. A clear correlation was observed between the porosity and the measured thermal conductivities. For water-saturated samples the thermal conductivity decreases more with increasing porosity than for ideal isotropic material as predicted by the geometric mean model. A clear positive correlation was also found between the thermal conductivity and the grain sizes of the samples. When the expected effect of porosity on the thermal conductivity was excluded, a linear correlation between the logarithm of the grain size and the measured thermal conductivities of the water-saturated samples was found. An anisotropy effect (a=k 0 /k ⊥ ) in thermal conductivity was observed for the samples, being most prominent for the coarsest ones. The measured anisotropy is assumed to be mainly due to the thermal anisotropic nature of the quartz crystal.

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“…3). Beziat et al (1988) concluded that the mineralogical composition was less important in modelling thermal conductivities of clays compared to water content (i.e. porosity) and density.…”

Section: Mineralogymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of grain size on thermal conductivity of quartz sands and silts

Midttømme

Roaldset²

1998

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“…The results show the effect on required surface storage time for UOX and MOX in granite and clay repositories due to changing the thermal conductivity of the buffer layer of the EBS from 0.6 W/m--K for a homogeneous bentonite buffer, to 2.0 W/m--K for a modified bentonite buffer that contains sand and graphite (Beziat 1992). Analysis of the clay repository also needs to account for the temperature limit of the bulk clay, if the EBS buffer conductivity improves sufficiently.…”

Section: Buffer Thermal Conductivitymentioning

confidence: 99%

Advanced Nuclear Fuel Cycle Effects on the Treatment of Uncertainty in the Long-Term Assessment of Geologic Disposal Systems - Ebs Input

Sutton¹,

Blink²,

Greenberg³

et al. 2012

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“…The measured anisotropy of thermal conductivity is an example of this influence, where a considerable variation in thermal conductivity is measured due to the direction of heat flow through the material. Thermal conductivity is shown to depend on the grain size and grain size distribution, where coarsegrained materials have higher thermal conductivity than finer material (Johansen, 1975;Beziat et al, 1992;Midttomme et al, 1997b). From the conductivities presented in Table 2 (Blackwell & TABLE 2.…”

Section: Mineralmentioning

confidence: 99%

Thermal conductivity of selected claystones and mudstones from England

1998

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The claystones and mudstones investigated are London Clay, Fullers Earth, Oxford Clay and Kimmeridge Clay. The thermal conductivities were measured using a divided bar apparatus and the values measured perpendicular to layering ranged from 0.68 to 0.97 W/mK. Comparative measurements of thermal conductivities were carried out by the needle probe method and Middleton's method. Deviations of up to 50% were obtained between the needle probe and the divided bar method. The thermal conductivities estimated from the geometric mean model based on mineralogy and water content ranged from 0.87 to 2.01 W/mK, considerably higher than the measured values. A correlation was found between the grain size distributions of the samples and the measured thermal conductivities. This textural effect on the thermal conductivity is assumed to be the main reason for the low measured values and the lack of correlation between the measured and the calculated values.

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Measurements of the thermal conductivity of clay-sand and clay-graphite mixtures used as engineered barriers for high-level radioactive waste disposal

Cited by 20 publications

References 4 publications

The effect of grain size on thermal conductivity of quartz sands and silts

The effect of grain size on thermal conductivity of quartz sands and silts

Advanced Nuclear Fuel Cycle Effects on the Treatment of Uncertainty in the Long-Term Assessment of Geologic Disposal Systems - Ebs Input

Thermal conductivity of selected claystones and mudstones from England

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