Thermal Conductivity of Sand–Tire Shred Mixtures

Xiao, Yang; Nan, Bowen; McCartney, John S.

doi:10.1061/(asce)gt.1943-5606.0002155

Cited by 35 publications

(13 citation statements)

References 30 publications

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“…In this study, the KD2 Pro thermal properties analyzer developed by METER Group, Inc. USA, was used as the test instrument, which belongs to transient method 15 . The KD2 Pro thermal properties analyzer is widely utilized as a tool to research thermal conductivity of soil 15,20,21 . The test probe is selected as the SH-1 probe with an accuracy of 5%, and 30 mm length.…”

Section: Methodsmentioning

confidence: 99%

Measurement and prediction on thermal conductivity of fused quartz

Zhang

Kong

Wang

et al. 2020

Sci Rep

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thermal conductivity of soil is a basic physical property related to heat conduction, and also is one of parameters widely applied in geotechnical engineering. The effect of gradation on the thermal conductivity of fused quartz was analyzed by thermal needle tests. The different particle size with the same uniformity coefficient (C u = 3.2) and different uniformity coefficient for the same particle size (0.10~1.00 mm) were considered in this study. It shows that the thermal conductivity of fused quartz decreases with the decreasing of the mean particle size and with the increasing of the porosity. Simple modified methods to estimate the value of thermal conductivity are proposed, and had been demonstrated successfully by conducting fused quartz, carbonate sand and ottawa sand.

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Section: Methodsmentioning

confidence: 99%

Measurement and prediction on thermal conductivity of fused quartz

Zhang

Kong

Wang

et al. 2020

Sci Rep

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“…In addition, in the case of mixtures with larger SR (i.e., mixtures with SR = 5.2), the smaller sand particles can penetrate rubber surface with increasing applied stress (Fig. 5) (Xiao et al 2019), resulting in a limited increase in connectivity between sand particles, and a consequent decrease in β with increasing SR.…”

Section: Pure Stress Impact On Thermal Conductivitymentioning

confidence: 99%

Thermal Conductivity of Sand-Tire Rubber Mixtures with Varying Tire Chip Fractions and Size Ratios as a Function of Void Ratio and Applied Vertical Stress

Oh,

Choo

2024

Preprint

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Sand–tire rubber mixtures are promising materials for thermal insulation. However, studies evaluating the impact of applied stress on the thermal conductivity (kt) of these mixtures are limited, despite the fact that energy storage tanks are typically located at deep depths where the sand–tire rubber mixtures may experience changes in the connectivity between sand particles under increasing stress. Therefore, in this study, thermal needle probe tests were conducted on sand–tire rubber mixtures with various size ratios (SR = 0.3, 1.4, and 5.2) and tire chip fractions (TF = 0.0, 0.1, 0.2, 0.4, and 1.0). To separate the impact of porosity and that of applied stress on kt of the tested sand–rubber mixtures, kt was measured as a function of porosity at very low stress levels. The kt values of the mixtures were then measured according to the applied vertical stress. The results of the tests performed at low stress levels demonstrated that kt of the tested mixtures decreased with increasing TF and decreasing SR because of the decrease in the number of sand-to-sand contacts. All mixtures showed a decrease in kt with increasing porosity; however, the dependence of kt on porosity was affected by TF and SR. With an increase in the applied stress, kt of all the mixtures increased. In particular, the tested mixtures with smaller SR showed even greater kt than pure sand at an applied vertical stress of 460 kPa, highlighting the significance of the applied stress on kt of the tested mixtures. Most notably, this study developed a novel thermal conductivity model that considers both the packing impact and pure stress impact, providing a more comprehensive framework for predicting the thermal conductivity of sand–tire rubber mixtures with varying SRs, TFs, porosities, and applied stresses.

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“…. Previous studies found that the particle size could greatly influence the thermal conductivity of sands (Lee et al 2015;Xiao et al 2019c;Zhang et al 2019;Zhang et al 2020).…”

Section: Predictions Of Thermal Conductivitymentioning

confidence: 99%

Thermal Conductivity of Biocemented Graded Sands

Xiao

Tang

et al. 2021

J. Geotech. Geoenviron. Eng.

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This paper includes an investigation of the thermal conductivity of biocemented soils to better understanding the regimes of heat transmission through soils treated by microbially induced calcium carbonate precipitation (MICP). A series of thermal conductivity tests using the transient plane source method (TPS) were performed on biocemented silica sand specimens with different gradations, void ratios, and MICP treatment cycles. The results showed that MICP treatment greatly improved the thermal conductivity of sand specimens. An increase in uniformity coefficient or a decrease in void ratio of the sand resulted in an increase in the thermal conductivity of MICP-treated specimens for a given MICP treatment cycle. The increment of thermal conductivity of MICP-treated specimens with respect to that of untreated specimens was also affected by gradation, void ratio and content of calcium carbonate. The greatest improvements in thermal conductivity were achieved for sands having an initial degree of saturation between 0.82 and 0.85. An empirical equation was established to predict the thermal conductivity of MICP-treated silica sand with different variables which may be useful in designing energy piles in biocemented sand layers.

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Thermal Conductivity of Sand–Tire Shred Mixtures

Cited by 35 publications

References 30 publications

Measurement and prediction on thermal conductivity of fused quartz

Measurement and prediction on thermal conductivity of fused quartz

Thermal Conductivity of Sand-Tire Rubber Mixtures with Varying Tire Chip Fractions and Size Ratios as a Function of Void Ratio and Applied Vertical Stress

Thermal Conductivity of Biocemented Graded Sands

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