Influence of microwave heating on the swelling properties of expansive soil in Hefei

Yao, Huayan; Lü, Jian; Bian, Hanbing; Zhang, Zhenhua

doi:10.1016/j.csite.2022.102466

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…That is, with the increase of temperature, along with the evaporation of crystal water in clay minerals and the destruction of layered structures, new mineral phases are formed. When the temperature is higher (over 900 °C), the fusible component in the clay begin to melt and the vitreous liquid phase appears to bind the non-fusible particles together (Yao et al, 2022).…”

Section: Mineral Contentmentioning

confidence: 99%

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Improvement of expansive soil by microwave irradiation

Yao

2024

AGG

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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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Section: Mineral Contentmentioning

confidence: 99%

“…and it is particularly important that the preliminary laboratory test showed that microwave irradiation could be used to treat expansive soil (Yao et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Improvement of expansive soil by microwave irradiation

Yao

2024

AGG

Self Cite

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“…Microwave heating is through electromagnetic waves in the material's internal loss of continuous conversion into the system's internal energy. Compared with grouting, roasting, freezing, and other methods of geotechnical material improvement, microwave technology consumes only electric energy, does not produce secondary pollutants in the treatment process, and has the advantages of low energy consumption, high efficiency, and environmental friendliness [44][45][46]. As shown in Figure 1b, the microwave heating system is mainly composed of a microwave source and a microwave antenna.…”

Section: Origin Materialsmentioning

confidence: 99%

Research on the Harmless Treatment of Weak Muddy Intercalation in Red-Bedded Soft Rock via Microwave Energy

Hu,

Gu,

Liu

et al. 2023

Minerals

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The WMI (weak muddy intercalation) is a typical weak structural surface in the red-bedded rock mass; ensuring slope stability by increasing the strength of the WMIs helps reduce project costs and carbon emissions. With the advantages of energy saving, high efficiency, and green, microwave technology has attracted scholars’ attention to geotechnical material property improvement. However, the mineral composition of the WMIs is complex and variable, and the applicability of microwave technology needs further evaluation. In this paper, the effects of microwave temperature and clay mineral types and content on the physical and mechanical properties of the WMIs were evaluated. The results show that microwave heating can substantially improve the uniaxial compressive strength of the WMIs, regardless of the types and content of clay minerals. Dehydration, dehydroxylation of clay minerals, and local melting of albite occurring in the specimens under microwave heating enhanced the strength of the soil particles and the interparticle joints. The strength increase ratios of the WMI specimens increased with the temperature increase. With the increase in clay mineral content, the strength increase ratio of kaolinite WMIs and illite WMIs decreased, while the strength increase ratios of montmorillonite WMIs increased. The present multiple regression analysis methods are used to establish the strength prediction models of the WMI microwave-reinforced specimens, which can guide the engineering application.

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“…At present, studies on the application of microwave to clay modi cation have increased greatly (Reinosa et al, 2019;Zhenzhurist, 2020;Hu et al, 2021), and some studies have shown that microwave has a good effect on the improvement of soil performance (Hu et al, 2019;Yao et al, 2022). However, there are few studies on the effect of microwave radiation on the physical and mechanical properties of expansive soil under dry-wet cycles.…”

Section: Introductionmentioning

confidence: 99%

Study on the effect of microwave irradiation improvement on the long-term stability of expansive soil

Zhang,

Hu,

et al. 2024

Preprint

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In dry-wet cycles, the clay minerals of expansive soil repeatedly hydrate and dehydrate, causing its expansion and contraction, resulting in many cracks, which will bring harm to human engineering construction. Microwave, as an efficient material improvement method, has been used in clay mineral synthesis and material manufacturing. Our previous studies have proved that microwave technology can improve the performance of soil, but the long-term stability of expansive soil by microwave has not been studied. In this paper, microwave technology is used to improve the performance of expansive soil, and the effect of microwave on the damage law and long-term stability of expansive soil under dry-wet cycles is studied. The soil was heated to 200°C, 300°C, 400°C and 500°C respectively by microwave irradiation, and dry-wet cycle tests were carried out. According to the data of SEM, unconfined compressive strength and free expansion rate, the damage law and long-term stability of expansive soil were analyzed. The results show that, compared with original samples, the compressive strength can be increased by 27 times and the expansion rate can be reduced to 0 by microwave heating to 500°C. In addition, microwave irradiation changes the way of fracture development. The change of fracture development pattern leads to the improvement of water resistance and strength of expansive soil, and thus the long-term stability of expansive soil is improved. The researches result of this paper can provide a reference for stability evaluation and design of expansive soil slope engineering.

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Influence of microwave heating on the swelling properties of expansive soil in Hefei

Cited by 7 publications

References 15 publications

Improvement of expansive soil by microwave irradiation

Improvement of expansive soil by microwave irradiation

Research on the Harmless Treatment of Weak Muddy Intercalation in Red-Bedded Soft Rock via Microwave Energy

Study on the effect of microwave irradiation improvement on the long-term stability of expansive soil

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