Heating effect on swelling behaviour of expansive soils

Wang, M. C.; Jao, Mien; Ghazal, M. S.

doi:10.1080/17486020802069067

Cited by 12 publications

(8 citation statements)

References 4 publications

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“…Due to combustion of organic matter, the potential to swell reduced, and the soil behaved like a cohesionless soil, which agrees with the findings of Wang et al (2008). The increase in strength as shown by the increase in CBR, and the reduction in swelling and shrinkage are probably as a result of breaking of the montmorillonite structure, largely attributed to the expansive behaviour and low strengths of expansive clays (Mitchell and Soga, 2005).…”

Section: Cbr Atterberg Limits and Free Swellsupporting

confidence: 79%

“…According Bell (1993), soil at temperatures of between 200 and 400 0 Cbegins to aggregate into granules and when the soil is heated to temperature of 400 0 C to 600 0 C, some irreversible changes which make the soil nonplastic and non-expansive. Wang et al (2008) also suggested that the formation of the larger particles is irreversible. Thus the black cotton under study experienced de-hydroxylation followed by an irreversible formation of larger particles/granules explaining the 80% combined sand and gravel fractions.…”

Section: Loss On Ignitionmentioning

confidence: 99%

“…Further, Wang et al (2008) published data for swelling behavior for commercial expansive clays. The research presented explored the effect of heating to 600 0 C of naturally occurring expansive clay.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Heat on the Properties of Expansive Clay Soil

2017

IJSR

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Abstract:The cost of cut to spoil of expansive soils during construction of infrastructure projects such as roads, airports, and housing estates has continued to increase due to high cost of excavation and haulage and the increasing scarcity of spoil areas due to development. Further, suitable borrow materials continue to deplete, with their locations getting further and further from the location where they would be required. The environmental consequences of cut to spoil and borrow to fill continue to soar. This has led into continuous research into suitable ways of improving and using expansive clays. Most research methods currently concentrate on attempting to stabilize these soils. The need to eliminate cut to spoil of expansive clays followed by borrowing suitable material for fill led to this research -improving the performance of expansive clays by subjecting it to high temperatures in a closed kiln to eliminate emission of greenhouse gases. This paper reports the effect of heating the expansive clay for 2 hours at a temperature of 600 0 C. The properties of the neat material were investigated which included compaction, the California Bearing Ratio (CBR), grading, atterberg limits, linear shrinkage, free swell, chemical composition and loss on ignition (LOI). The same properties were investigated for the heated expansive clay. The heating increased the maximum dry density (MDD), the CBR, altered the particle size distribution, reduced the plasticity index, the free swell and linear shrinkage hence reduction in plasticity. The properties of the expansive soil were therefore improved. It was concluded that subjecting the soil to 600 0 C makes it suitable as a fill material.

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Section: Cbr Atterberg Limits and Free Swellsupporting

confidence: 79%

Section: Loss On Ignitionmentioning

confidence: 99%

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The Effect of Heat on the Properties of Expansive Clay Soil

2017

IJSR

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“…The size of clay particles increases by enforcing the heat on the specimens, which increases the volume of cavities. Therefore, The void ratio is very likely to increase by increasing the temperature [30,31].…”

Section: Weight Change In Kaolinite Specimensmentioning

confidence: 99%

The Effect of Heat on the Settlement Properties of Cement-stabilized Clay Soil

2022

IJE

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Clay soil may be subjected to heat in various applications, such as nuclear waste burial sites and high voltage transmission lines. The impact of heat on clay soil's physical and mechanical properties has been explored in previous studies. However, previous studies have mainly focused on the mechanical properties of clay soil without stabilizers, and the effect of heat on the properties of the stabilized clay soil is scarcely studied. The present paper has analyzed and studied the combined effects of heat and cement on the settlement properties of kaolinite clay soil. To conduct the study, kaolinite clay mixed with various degrees of cement was exposed to a range of 25 to 600 degrees Celcius. The results showed that the coefficient of consolidation gradually decreased by increasing heat up to the dehydroxylation point. An increase in heat up to 200 degrees Celcius resulted in increasing the coefficient of consolidation in the specimens containing cement. In specimens containing 10 percent of the cement at temperatures higher than 200 degrees Celcius, the coefficient of consolidation in room temperature decreased by 73 percent compared to kaolinite. Moreover, the void ratio increased in kaolinite specimens without cement when subjected to heat up to 400 degrees Celcius. By increasing the heat, the void ratio decreased in specimens containing 10 percent cement.

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“…It is worth mentioning that some studies have shown that high temperature can reduce the expansion potential of soils (Wang et al, 2008;Estabragh et al, 2016). Microwave irradiation is a fast-heating method, Microwave oven.…”

Section: Introductionmentioning

confidence: 99%

Improvement of expansive soil by microwave irradiation

Yao

2024

Acta Geodynamica Et Geomaterialia

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This paper presents an experimental investigation of the use of microwave irradiation to improve the characteristics of expansive soils. The expansive soil samples were subjected to microwave heating in an industrial microwave oven, and were followed by analysis of the soil characteristics such as the specific gravity, liquid and plastic limit, free swelling ratio, vertical free swelling strain and swelling pressure. X-ray diffraction was also used to determine the mineral composition of the samples. Experimental results showed that the microwave irradiation induces both a rapid increase in the soil temperature and a significant change in the soil mineral content. With the increase in the power level, we observed first an increase in the specific gravity up to a peak, which was followed by a decrease. For the other characteristics such as the liquid and plastic limit, the free swelling ratio, the vertical free swelling strain and the swelling pressure, their values were observed a decrease with the increase in the power level. The change in the soils characteristics could be attributed to the impact of the irradiation on the expulsion of the interlayer structure water and on the change of soil mineral content or structure.

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Heating effect on swelling behaviour of expansive soils

Cited by 12 publications

References 4 publications

The Effect of Heat on the Properties of Expansive Clay Soil

The Effect of Heat on the Properties of Expansive Clay Soil

The Effect of Heat on the Settlement Properties of Cement-stabilized Clay Soil

Improvement of expansive soil by microwave irradiation

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