The thermal conductivity for granite with various water contents

Cho, W.J.; Kwon, Soonjo; Choi, Jongwon

doi:10.1016/j.enggeo.2009.05.012

Cited by 96 publications

(39 citation statements)

References 9 publications

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“…For the thermal conductivity of the rock material, a standard value for saturated granitic rock of 3.5 W −1 K −1 m −1 (Cho et al, 2009) was chosen and the water content (porosity) was set to 1% which is a common value employed in rock wall permafrost modelling (Gruber et al, 2004b;Hipp et al, 2014). With the selected values, the modelled temperatures can roughly reproduce the amplitude of the seasonal oscillations registered at 10 m-depth at BH_S.…”

Section: Model Parametrization Initialization and Evaluationmentioning

confidence: 98%

Snow control on active layer thickness in steep alpine rock walls (Aiguille du Midi, 3842ma.s.l., Mont Blanc massif)

Magnin

Westermann

Pogliotti

et al. 2017

CATENA

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Section: Model Parametrization Initialization and Evaluationmentioning

confidence: 98%

Snow control on active layer thickness in steep alpine rock walls (Aiguille du Midi, 3842ma.s.l., Mont Blanc massif)

Magnin

Westermann

Pogliotti

et al. 2017

CATENA

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“…The addition of the ice in the whole modelled medium is expressed throughout the bulk volume as ε a + ε w + ε i + ε r = 1, with ε a , ε w , ε i and ε r the bulk fractions of air (ε a = 0 in our case), water, ice and rock respectively. A relation is established between the bulk volume of ice and the bulk volume of liquid, which is the mass fraction per bulk volume of the unfrozen liquid to the total liquid mass, also called the freezing function F (Clausnitzer and Mirnyy, 2015):…”

Section: Heat Transfers: Numerical Approachmentioning

confidence: 99%

“…The thermal conductivity of the rock was set to 3 W m −1 K −1 , which stands for a conservative value for saturated granitic rock (Cho et al, 2009). However, the thermal conductivity of a saturated media does not only depend on the mineral properties, but also on the liquid or solid state of water, ice being up to six times more conductive than water at 0 • C (Williams and Smith, 1989).…”

Section: Thermal Parametersmentioning

confidence: 99%

Modelling rock wall permafrost degradation in the Mont Blanc massif from the LIA to the end of the 21st century

et al. 2017

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Abstract. High alpine rock wall permafrost is extremely sensitive to climate change. Its degradation has a strong impact on landscape evolution and can trigger rockfalls constituting an increasing threat to socio-economical activities of highly frequented areas; quantitative understanding of permafrost evolution is crucial for such communities. This study investigates the long-term evolution of permafrost in three vertical cross sections of rock wall sites between 3160 and 4300 m above sea level in the Mont Blanc massif, from the Little Ice Age (LIA) steady-state conditions to 2100. Simulations are forced with air temperature time series, including two contrasted air temperature scenarios for the 21st century representing possible lower and upper boundaries of future climate change according to the most recent models and climate change scenarios. The 2-D finite element model accounts for heat conduction and latent heat transfers, and the outputs for the current period (2010)(2011)(2012)(2013)(2014)(2015) are evaluated against borehole temperature measurements and an electrical resistivity transect: permafrost conditions are remarkably well represented. Over the past two decades, permafrost has disappeared on faces with a southerly aspect up to 3300 m a.s.l. and possibly higher. Warm permafrost (i.e. > −2 • C) has extended up to 3300 and 3850 m a.s.l. in N and S-exposed faces respectively. During the 21st century, warm permafrost is likely to extend at least up to 4300 m a.s.l. on S-exposed rock walls and up to 3850 m a.s.l. depth on the N-exposed faces. In the most pessimistic case, permafrost will disappear on the S-exposed rock walls at a depth of up to 4300 m a.s.l., whereas warm permafrost will extend at a depth of the N faces up to 3850 m a.s.l., but possibly disappearing at such elevation under the influence of a close S face. The results are site specific and extrapolation to other sites is limited by the imbrication of local topographical and transient effects.

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“…Thus, the thermal conductivity of granite aggregate increases with aggregate moisture content increases [28].…”

Section: Effects Of Aggregate Moisture Content On Epoxy Curing Degreementioning

confidence: 99%

“…Thermal conductivity is an important material property controlling the transport and exchange of thermal energy [28]. Aggregate moisture content has a great effect on thermal conductivity of granite aggregate.…”

Section: Effects Of Aggregate Moisture Content On Epoxy Curing Degreementioning

confidence: 99%

Influence of Aggregate Moisture Content on the Mechanical Properties of Resin Mineral Composite

Yin¹,

Zhang²,

Zhang³

et al. 2015

Proceedings of the International Conference on Chemical, Material and Food Engineering

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INTRODUCTIONMachine tool bed plays an important role in the manufacturing industry, which could provide mechanical products of better precision and surface quality. However, vibration generated in the machining process has much more influence on the dimensional precision and surface quality of the workpiece, which prohibits high-speed and high-precision machining from developing rapidly. How to minimize vibration during the manufacturing process is now an important factor that affects machining precision and the stability of machine tool [1] [2].Resin mineral composite (RMC) is a composite material similar to plain concrete that it is composed of granite particles as solid aggregate. The difference is that the binder is organic resin. With the development of high-speed and high-precision machining technology, RMC has attracted more and more attention for its good vibration alleviating properties [3]. Compared with gray cast iron and welded steel, RMC has ten times the damping ratio that it can better absorb vibrations generated in the machining process, especially in high-speed and high-precision machining processes [2] [4]. However, the application of RMC is restricted by its limitation in mechanical strength, and considerable research should be done to improve its mechanical properties in order to satisfy the requirements of high-speed and high-precision machining.The mechanical strength of fully cured RMC is highly related to its components and the interface between the resin matrix and filler [5] on the mechanical strength of RMC. However, little information has been focused on the influences of aggregate moisture content on the mechanical strength of RMC. As the key component in RMC to bear loads, the aggregate weight of the total composite material accounts for more than 85%, the physical and chemical properties of the aggregate has a significant impact on the mechanical properties of RMC [5]. Influence of aggregate moisture content on the mechanical strength of RMC was not received sufficient attention. Fontana and Reams [14] revealed that 3% of pre-existing water in aggregates reduces the compressive strength of the PC by half. Header and Mohammad [15] found that the polymer concrete's flexural strength decreased from 25.8 MPato 0.68 MPa and compressive strength from 190MPa to 85 MPa when the initial moisture added to the aggregate content increased from 0% to 5%. However, data is still scarce. We need to provide more documents. In this International Conference on Chemical, Material and Food Engineering (CMFE-2015)

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The thermal conductivity for granite with various water contents

Cited by 96 publications

References 9 publications

Snow control on active layer thickness in steep alpine rock walls (Aiguille du Midi, 3842ma.s.l., Mont Blanc massif)

Snow control on active layer thickness in steep alpine rock walls (Aiguille du Midi, 3842ma.s.l., Mont Blanc massif)

Modelling rock wall permafrost degradation in the Mont Blanc massif from the LIA to the end of the 21st century

Influence of Aggregate Moisture Content on the Mechanical Properties of Resin Mineral Composite

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