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·The cellular concrete ACE had better heat insulation property in the summer and the crushed rock ACE had stronger natural convection in winter The crushed rock layer has a thermal
·The relevant experimental and numerical results are useful for investigating mechanical properties and failure mechanisms of rock masses in cold regions subjected to F T cycles Evaluation of the long term thermal stability of a crushed rock revetment embankment in pan Arctic permafrost regions under the effect of snow drift Energy Volume
·ABSTRACT To investigate temperature effects on the thermal transport properties of several typical rocks thermal conductivity thermal diffusivity and specific heat capacity or volumetric heat capacity of dry granite gabbro marble and sandstone samples and a fused silica sample were measured under high ambient temperature conditions from room
All the important thermal properties of rocks can be estimated from the graphs and tables in this report Most of the useful published data are summarized herein to provide fairly accurate evaluations of thermal coefficients and parameters of rocks for many engineering and scientific purposes Graphs of the published data on common rocks and minerals were prepared to
·The study of changes in the physical properties of rocks as a function of thermal cracking is relevant to various engineering applications A nuclear waste repository is essentially an excavated underground cavity composed of tunnels and openings in which radioactive waste is emplaced [3] This waste releases heat after placement and causes a long term an increase in
·The cooling performance is mainly determined by the forced convective heat transfer process; 2 pore air flow pattern can change thermal resistance of the crushed rock layer Larger thermal
·Thermal properties of samples from laboratory consolidated granular salt and in situ consolidated granular salt were measured using a transient plane source method at temperatures ranging from 50 to 250 °C 2015 Thermal and physical properties of reconsolidated crushed rock salt as a function of porosity and temperature Acta Geotech
·Crushed rock embankment CRE which is implemented to construct roadways in permafrost regions effectively protects underlying permafrost because natural air convection occurs within crushed rock layer CRL embedded in the embankment Considering the effect of climate warming and special geological conditions this study investigated the impact of the
·The current crushed rock interlayer structure which was successfully adopted in construction of the Qinghai Tibet Railway cannot maintain the foundation stability of expressways in permafrost
Based on Table 3 the physical properties of coarse aggregate crushed stone are the bulk specific gravity of coarse aggregate is minimum specification water absorption %
This study focusses on laboratory evaluation of hydrogeological and thermal properties of three crushed rock bentonite mixtures % % and % bentonite for a potential use as a moisture
·Crushed rock subgrade as one of the roadbed cooling methods has been widely used in the Qinghai Tibet Railway Much attention has been paid on the cooling effect of crushed rock; however the
Numerical simulation on the effects of deteriorating crushed rock interlayers on thermal stability of embankments in permafrost regions Author links open overlay panel Yanqiao Zhou a b Mingyi Zhang a b Wansheng Pei a b Ruiqiang Bai a b This is primarily because its excellent physical conservation properties
·Natural aggregate such as sand gravel or crushed rock is the major constituent of concrete in terms of both volume and mass Since huge amount of concrete is produced annually it logically follows that much quantity of natural aggregate is mined for the production of concrete There is dearth of literature on thermal insulation properties
·The increased rainfall in summer induces warming and humidification of the Qinghai Tibet Plateau significantly affecting the temperature boundaries and cooling effects of the crushed rock embankment CRE The crucial issue of quantitatively characterizing the hydrothermal changes and the cooling effects of CRE has not been considered in previous
·Zeolite poor rock combined eggshell foams were synthesized using the alkali activation and reactive sintering technique Fig 1 Crushed zeolite poor rock powders were mixed with different proportions of eggshell Table 1 15 wt% of NaOH granules were dissolved in distilled water to prepare 1 M NaOH which were then added to the previously prepared zeolite
·A comprehensive data compilation in respect to thermo mechanical parameters of granite exposed to temperatures up to about 1000 °C is presented Most material parameters experience a significant change with increasing temperature connected with thermal induced cracking Some of them tensile strength Young s modulus cohesive strength thermal
·The crushed rock embankment has been used as a mainstream technology to maintain road foundation stability on the Tibet Plateau Now a new problem has to be faced aeolian sand fills the pore spaces of rock layer and may influence the cooling effect of blocky material and thus warm permafrost thermal regimes
·Thermal conductivity also heat conductivity λ Physical property governing heat diffusion in the steady defines how much heat flows across a unit cross section of rock along a unit distance per unit temperature decrease per unit time; dimension W m −1 K − Thermal diffusivity κ Physical property governing transient heat is defined by the
·Yavuz H Demirdag S Caran S 2010 Thermal effect on the physical properties of carbonate rocks Int J Rock Mech Min Sci 47 94 103 Article Google Scholar Zeisig A Siegesmund S Weiss T 2002 Thermal expansion and its control on the durability of marbles Geol Soc Lond Special Publ 205 65 80
·The permeability and thermal conductivity of bentonite/crushed rock mixtures used as backfill for a nuclear waste repository have an important impact on the maximum radioactive load of the waste canister that can be embedded Our research pursues useful methods for estimating the permeability thermal conductivity and specific heat of various
·This study focusses on laboratory evaluation of hydrogeological and thermal properties of three crushed rock bentonite mixtures % % and % bentonite for a potential use as a moisture
DOI / Corpus ID 263724821; Evaluation of portable Raman spectroscopic analysis for source rock thermal maturity assessments on bulk crushed rock
·The simulation results demonstrate that a properly designed crushed rock embankment can effectively maintain the long term thermal stability of the road embankment in permafrost regions [[19] [20] [21]] These studies have confirmed that the crushed rock layer has good cooling performance on the embankment and its underlying permafrost
·The viability of a specific type of crushed rock for storage depends upon long term chemical and mechanical stability of the rock during thermal cycling Crushed rock is used and proposed for many heat storage systems because the capital costs per unit of sensible heat storage is more than an order of magnitude less than other energy storage media
