Thermal properties of soft clayey soils from the former Lake Texcoco in Mexico

López-Acosta, Norma Patricia; Portillo-Arreguín, Diana Margarita; Barba-Galdámez, David Francisco; Singh, Rao Martand

doi:10.1016/j.gete.2022.100376

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…Similar observations have been reported for former lake Texcoco soils that increase in porosity (decrease in γ d ) causes increase in speci c heat capacity [72]. The rise in C v might be upto 3.2 MJ/m 3 K at full saturation level for clayey soils have been observed [53,72,73]. Moreover, Zhou and Si [56] reported the C v from 0.6 to 3.65 MJ/m 3 K for peat and it has observed that C v strongly in uenced by w rather than γ d , similar trends were also found in this study.…”

Section: Thermophysical Properties Of Geomaterialssupporting

confidence: 87%

“…The variation of C v of geomaterials were found in the order of 1.00-1.25 MJ/m 3 K at dry conditions (w = 0). Similar observations have been reported for former lake Texcoco soils that increase in porosity (decrease in γ d ) causes increase in speci c heat capacity [72]. The rise in C v might be upto 3.2 MJ/m 3 K at full saturation level for clayey soils have been observed [53,72,73].…”

Section: Thermophysical Properties Of Geomaterialssupporting

confidence: 82%

“…The thermal conductivity of geomaterials and mixtures increases with larger rate upto the TWC, however it can be seen that increasing rate has relatively smaller after the TWC. As such as water has higher thermal conductivity and speci c heat than air pores, causes improvement in thermal properties with increase of water content [72]. Moreover, the soil solid has higher thermal conductivity and speci c heat than water, hence water lm around the particles and grain to grain contact both promote the thermal conductivity at lower water content and the improvement on the thermal conduction is rapid [67,70].…”

Section: Discusionmentioning

confidence: 99%

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Thermophysical Properties of Bentonite–Sand/Fly Ash-Based Backfill Materials for Underground Power Cable

2023

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The surrounding (back ll) materials around the underground power cable systems are essential for dissipiating the heat away from it, during the exertion phases. The heat dissipiation restrains the thermal instability and risk of progressive drying of the back ll materials, thus, reduce thermal stress on power cable. Thermal instability is the reduction of thermal properties (conductivity or diffusivity) due to migration of moisture because of heat accumulation. Thus, the back ll materials should have adequate thermal properties and favorable water retention capacity, which will falicitate the heat transfer easily from the heat source to the surrounding area with minimal moisture migration. The bentonite have high water retention capacity, but low thermal conductivity. Sand/ y ash exhibit low water retention and have higher thermal conductivity than bentonite. The addition of bentonite promote the water holding capacity and thermo-physical properties of sand and y ash. Therefore, this study presents the thermal properties of back ll materials, bentonite-y ash (B-F) and bentonite-sand (B-S) at varying weigth-percent of sand and y ash with bentonite. various compositions of the mixtures were compacted to varying dry densities and water contents and thermal properties variation of back ll materials were measured using a dual thermal needle probe 'KD2 Pro 2008' at room temperature. The study deals with systematic evaluation of the volumetric speci c heat capacity, thermal conductivity and diffusivity of back ll materials against varying dry density and water content. The threshold water content (TWC) has been determined from the thermal diffusivity-water content variation curve and it has correlated with plastic limit (PL) and optimum mosite conetn (OMC). Thereafter, the e cacy two thermal conductivity prediction models also were statistically evaluated with respect to experimental results.

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