Comparative study on thermal properties of undisturbed and compacted lateritic soils subjected to drying and wetting

Xu, Yunshan; Zeng, Zhaotian; Sun, Deqing; Li, Haibo

doi:10.1016/j.enggeo.2020.105800

Cited by 26 publications

(10 citation statements)

References 47 publications

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“…The aggregation of the soil particles forms a rough surface, resulting in a well interlocking condition between soil aggregates. The obtained microstructure results in the current research are consistent with previously researched papers [57,68,76,92,93]. The obtained result of the EDX experiment is illustrated in Figure 11.…”

Section: Microstructural and Chemical Characteristicssupporting

confidence: 91%

Characterization of lateritic soil based on literature and lab testing

Roshan

Hezmi

Rashid

et al. 2022

Preprint

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Lateritic soil resulting from weathering, particularly the chemical weathering process of rocks, is found widely in tropical and subtropical countries such as Malaysia, Thailand, Singapore, and Brazil. The characteristics of this residual soil depend on many factors, including weathering degree, chemical compositions, and laterization degree, indicating their varying properties from one place to another. Thus, it is essential to explore their characteristics before using them as a construction material for a particular structure. In this paper, a lateritic soil sampled from Universiti Teknologi Malaysia has been explored in terms of grain size distribution (GSD), Atterberg limits, specific gravity, compaction, unconfined compressive strength (UCS), unconsolidated undrained (UU) test, FESEM, and EDX. The obtained results indicated that the soil is classified as plastic silt (MH) and A-7-5 according to USCS and AASHTO methods, respectively. The optimum moisture content (OMC) and maximum dry density (MDD) were obtained 28 % and 1.39 g/cm3, respectively, based on the standard compaction method. The unconfined compressive strength (UCS) is 200.75 kPa, whereas, in the unconsolidated undrained (UU) test, the deviator stress is equal to 449.4 kPa, 529.3 kPa, and 674 kPa for 50, 100, and 200 kPa, respectively. The total friction angle and undrained cohesion are 25.69° and 115.82 kPa, respectively. According to the FESEM results, the matrix microstructure was detected for the soil. The O, Al, Si, and Fe were detected as primary chemical elements in the soil. The results of this study can help the practitioners to classify the laterite soil and decide based on its characteristics.

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Section: Microstructural and Chemical Characteristicssupporting

confidence: 91%

Characterization of lateritic soil based on literature and lab testing

Roshan

Hezmi

Rashid

et al. 2022

Preprint

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“…Інші вчені наводять дані, що теплофізичні властивості ґрунту визначаються переважно загальним умістом органічної речовини, а не структурно-агрегатним складом, щільністю та вологістю (Zhu et al, 2019). Результати, отримані Xu et al (2020), свідчать, що збільшення щільності ґрунту призводить до зменшення теплопровідності і майже не впливає на теплоємність. До основних факторів, які визначають теплові властивості ґрунту, Usowicz et al (2017) відносять уміст кварцу та води, а також щільність ґрунту.…”

Section: вступunclassified

Features of soil thermophysical properties of the southern variant of ravine biogeocenoses of the Ukrainian steppe zone

Gorban

2020

ean

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Thermophysical properties are an important characteristic of the general condition of soils, which determine the peculiarities of the distribution of heat flow in them. Today studies of thermophysical properties of soils, including the steppe zone of Ukraine, are practically not performed. This determines the relevance of the work, which is devoted to establishing the characteristics of the thermal properties of various soils. As a result of the study of thermal diffusivity, heat capacity and thermal conductivity of soils of northern and southern exposures, as well as the thalweg of the Voyskovoy Bayrak (located near the village of Voyskovoe Solonyansky district of Dnipropetrovsk region), it was found that the most important soil factors particles of physical clay and organic matter content. It was found that the eluvial horizons of the chernozem of the forest of the northern exposure differ in the reduced values of heat capacity and thermal conductivity in comparison with the illuvial horizons. Eluvial horizons of forest-meadow soil of thalweg are characterized by increased values of thermal diffusivity and thermal conductivity, as well as reduced values of heat capacity compared to illuvial horizons. Eluvial horizons of forest chernozem of southern exposure are characterized by lower values of thermal diffusivity, heat capacity and thermal conductivity compared to illuvial horizons. The most significant boundary between eluvial and illuvial horizons in terms of thermophysical properties is characteristic of the chernozem of forest southern exposure, which is manifested in a sharp increase in the values of thermophysical properties in the first illuvial horizon. Cluster analysis revealed that the most similar in terms of thermal diffusivity are forest chernozems of southern and northern exposures, and in terms of heat capacity and thermal conductivity – forest chernozems of northern exposure and forest-meadow soil of thalweg ravine.

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“…obtained that at the same water content and dry density, the thermal conductivity of lateritic clay increased with increasing temperature, and found that the effect of temperature on the thermal conductivity is mainly related to the latent heat transfer (LHT) of water vapor in soils. Soon later, Xu et al 44 …”

Section: Introductionmentioning

confidence: 98%

“…Xu et al 43 obtained that at the same water content and dry density, the thermal conductivity of lateritic clay increased with increasing temperature, and found that the effect of temperature on the thermal conductivity is mainly related to the latent heat transfer (LHT) of water vapor in soils. Soon later, Xu et al 44 found that the difference in microstructure between undisturbed and compacted lateritic clay specimens directly affects the heat transfer paths, such as contact and F I G U R E 1 Schematic of consolidation of the bilayered saturated soils liquid bridge between soil particles. Yuan et al 45 studied the mechanical and deformation characteristics of the interface between the insulation layer and the wall based on the nonlocal theory and the fractional-order generalized thermoelastic theory.…”

Section: Introductionmentioning

confidence: 99%

A general interfacial thermal contact model for consolidation of bilayered saturated soils considering thermo‐osmosis effect

Wen

Tian

et al. 2022

Num Anal Meth Geomechanics

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In this paper, a general interfacial thermal contact model is proposed to investigate the heat conduction characteristics at the interface of bilayered saturated soils. The semianalytical solutions of thermal consolidation of the bilayered saturated soils considering thermo-osmosis effect under ramp-type heating are derived by using the Laplace transform. Then, the expressions of the temperature increment, excess pore water pressure, and displacement are obtained in time domain by using the Crump's method. Comparisons are performed to verify the rationality of the obtained solutions, and the influences of contact transfer coefficient, partition coefficient, and the thermo-osmosis coefficient on the thermal consolidation of the bilayered saturated soil are illustrated and discussed. Neglecting the thermal contact resistance would overestimate the thermal consolidation behavior of the bilayered saturated soils. The calculated excess pore water pressure and displacement considering thermo-osmosis effect are much larger than those without thermo-osmosis effect.

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Comparative study on thermal properties of undisturbed and compacted lateritic soils subjected to drying and wetting

Cited by 26 publications

References 47 publications

Characterization of lateritic soil based on literature and lab testing

Characterization of lateritic soil based on literature and lab testing

Features of soil thermophysical properties of the southern variant of ravine biogeocenoses of the Ukrainian steppe zone

A general interfacial thermal contact model for consolidation of bilayered saturated soils considering thermo‐osmosis effect

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