Effect of Temperature on Hysteretic Behavior of Water Retention Capacity for Clay–Sand Liners

Al-Mahbashi, Ahmed M.; Al‐Shamrani, Mosleh; Dafalla, Muawia; Basu, Dipanjan

doi:10.1007/s40098-020-00469-5

Cited by 3 publications

(3 citation statements)

References 35 publications

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“…Based on characterization results, Al-Qatif clay is classified as clay with high plasticity (CH) and has high to very high swell potential. Mineralogical characterization of this clay using the X-Ray diffraction technique conducted by Al-Mahbashi [40] and Al-Mahbashi et al [41] revealed that the dominant clay minerals are montmorillonite and palygorskite (attapulgite). Rafi [42] reported that the percentages of montmorillonite and palygorskite in this clay reach up to 23% and 33%, respectively; considerable content of such minerals interpret the high swell potential of this clay.…”

Section: Soil Used and Geotechnical Characterizationmentioning

confidence: 97%

The Role of Stress States on the Hysteric Behavior of Expansive Soil under Multiple Drying-Wetting Cycles

2023

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Expansive soils in the field are typically exposed to cyclic wetting and drying due to climatic fluctuations and subjected to a variety of stress conditions in nature or when used as compacted layers for the construction of hydraulic barriers or waste disposal facilities. The hysteric behavior of the soil-water characteristic curve (SWCC) is a key parameter for understanding, modeling, and interpreting the unsaturated behavior of these soils under such conditions. This study investigates the effect of stress states on the hysteresis behavior of soil-water characteristic curves (SWCCs) for compacted highly expansive clay over a range of matric suction between 0 and 1500 kPa. Two test series were performed, the first test series investigated the effect of stress states on the hysteresis of SWCCs during a single drying-wetting (DW) cycle. The second test series studied the combined effect of stress applied and multiple drying-wetting cycles on the SWCC hysteresis. For the sake of comparison, the overall SWCC hysteresis due to drying-wetting cycles was quantified using the average degree of hysteresis in terms of volumetric water content (ADHθ). Furthermore, contributors to the observed hysteresis were defined using two newly proposed measures; namely, average degree hysteresis in terms of gravimetric water content (ADHw) and in terms of volume change (ADHe*). The outcomes of this study indicate that consideration of stress states on the hysteresis of SWCC for expansive clay is of great importance. The results show a dual trend for the variation of ADHθ with applied vertical stress. Furthermore, multiple DW cycles induced a significant reduction in the hysteresis (ADHθ) under low- and high-stress states up to a certain level of DW cycles, then, no further changes in the hysteresis trend were detected. It was also found that hysteresis loops under a low-stress state were concentric in shape while hysteresis loops for specimens under a high-stress state were non-concentric, with a downward shift in hysteresis loops with the increase in DW cycles.

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Section: Soil Used and Geotechnical Characterizationmentioning

confidence: 97%

The Role of Stress States on the Hysteric Behavior of Expansive Soil under Multiple Drying-Wetting Cycles

2023

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“…Over the past 20 years, this particular sort of clay has been the subject of numerous investigations. This clay can be used in cover layers and clay-sand liners for a variety of environmental applications [23,24]. Clay-sand mixtures were prepared using clay contents of 10%, 20%, and 30%.…”

Section: Laboratory Thermal Testsmentioning

confidence: 99%

Improvement of Subsurface Thermal Characteristics for Green Parks

Dafalla,

Al-Mahbashi

2023

Applied Sciences

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The ground surface of green parks in arid and semi-arid areas may not be comfortable at specific times during the day and night due to the sun and the rate at which the subsoil gains or loses heat. Knowledge of the subsurface soil’s thermal properties can provide designers with convenient and comfortable settings. Design focus is generally directed toward stability, density, and hydraulic conductivity. An assessment of the thermal properties of clay–sand mixtures of 10%, 20%, and 30% clay content is conducted. The proposed clay–sand layers are subjected to three different thermal gradients of 30, 20, and 10 degrees of magnitude. The profile of temperature changes was monitored using 5TE sensors and data loggers. The mixtures were also subjected to cooling at room temperature. The results indicate that the clay type and the clay content govern the response of subsurface clay–sand liners to temperature gain and loss. Two field sections with clay–sand layers of 15% and 20% clay were examined for temperature changes over an extended period. In winter, green areas rich in clays were found to keep heat for several hours and provide relatively warm evenings. In summer, the mixture retains a cool temperature for some time during the day.

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“…In addition, refs. [ 3 , 4 , 5 , 6 , 7 ] have examined the impact of inorganic acid on various soil qualities. According to all of these researchers, the leakage of inorganic acids leads to soil contamination; this contamination can cause significant changes to the soil’s engineering properties, such as its design tolerance, compressibility, and strength, resulting in construction problems for facilities built on such soil.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the Acid Resistance of Silty Clay Using Nano-Magnesium Oxide

2023

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Hydrochloric acid is prevalent in numerous industries; leakage of this acid may cause persistent problems in the soil. The study aims to prevent any adverse impact of acid on the strength characteristics of silty clay soil by modifying the soil’s acid resistance. In this study, unconfined compression tests are performed to investigate the strength of contaminated silty clay soil with concentrations of 4%, 8%, and 12% of HCl solution and the strength of treated soil with 0.4%, 0.5%, 0.6%, and 0.8% of nano-magnesium oxide. In addition, the strength of the soil enhanced with nano-MgO contaminated with different concentrations of hydrochloric acid was investigated to assess the effect of nano-MgO on modifying the acid resistance of clay soil. Moreover, the FE-SEM test was performed to analyze the microstructure of the soil under different circumstances. Based on the results, the strength of clay soil decreased due to contamination with the hydrochloric acid solutions; the reduction in strength was more noticeable when the acid solution became more acidic. Adding 0.6% of nano-magnesium oxide enhances the strength by about 114%. Findings show that adding 0.6% nano-MgO to the soil before exposing it to hydrochloric acid can enhance its acid resistance; the strength of the treated soil with nano-MgO was better at resisting the acid than the untreated soil.

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Effect of Temperature on Hysteretic Behavior of Water Retention Capacity for Clay–Sand Liners

Cited by 3 publications

References 35 publications

The Role of Stress States on the Hysteric Behavior of Expansive Soil under Multiple Drying-Wetting Cycles

The Role of Stress States on the Hysteric Behavior of Expansive Soil under Multiple Drying-Wetting Cycles

Improvement of Subsurface Thermal Characteristics for Green Parks

Enhancement of the Acid Resistance of Silty Clay Using Nano-Magnesium Oxide

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