Experimental study on strength characteristics and internal mineral changes of Lime-stabilized loess under High-Temperature

Wei-xing, Bao; Wang, Haibo; Lai, Hongpeng; Chen, Rui

doi:10.1016/j.conbuildmat.2022.128945

Cited by 7 publications

(3 citation statements)

References 38 publications

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“…In this area, weathering of halite is the main mineral weathering process (Shen, 2020). In addition, weathering of silicate, calcite, and carbonate components may also dominate groundwater chemistry, as these mineral components are the main constituents of loess (Bao, 2022).…”

Section: Mineral Weathering Processes and Ion Exchange Processesmentioning

confidence: 99%

Pollution characteristics and Groundwater ion source analysis of the last 20 years in a semi-arid region of northwest China

Liu

Ayyamperumal

et al. 2023

Preprint

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Groundwater hydrochemistry analysis can be used to assess the general quality of groundwater as well as how groundwater has changed over time and how anthropogenic activities have affected it. In this study, total dissolved solids (TDS), pH and 10 ions (Na+, K+, Mg2+, Ca2+, Cl-, SO42-, NO3-, CO32-, HCO3- and F-) were measured at 34 sites in the main urban area of Lanzhou, a major city in northwest China, by means of boreholes in 2002 and 2022 respectively. The evolution of groundwater chemistry in the region over a twenty-year period due to mineral weathering and dissolution, ion exchange, and urban activity was explained using a geochemical model, chlor-alkalinity index, and correlations between Cl- and NO3- in the urban area. In addition, statistical methods were used to analyze groundwater ion sources and compare the ion source characteristics over a twenty-year period to reveal the extent to which urbanization and industrialization have influenced groundwater. The results show that overall groundwater quality in the area has improved over the last two decades, with little change in groundwater chemistry type. Furthermore, the chemical ions in groundwater were influenced less by industrialization and more by urban anthropogenic activities, which include not only urban wastewater discharge but also the rapid reduction of groundwater levels due to extensive urban construction activities. It is recommended that groundwater quality be further improved through enhanced municipal management measures, which should focus on the threat posed by groundwater precipitation in addition to considering the control of sewage discharge.

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Section: Mineral Weathering Processes and Ion Exchange Processesmentioning

confidence: 99%

Pollution characteristics and Groundwater ion source analysis of the last 20 years in a semi-arid region of northwest China

Liu

Ayyamperumal

et al. 2023

Preprint

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“…At present, loess is mainly improved by adding traditional improvement materials such as lime, cement, fly ash, and new improvement materials such as microorganisms and chemical curing agents. Bao et al 7 chose lime and fly ash as the improved materials, and studied the change rule of their shear strength and permeability coefficient. However, the improvement of permeability coefficient by lime was limited, and the final permeability coefficient was reduced by 4% to 7.7%.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of influence of amide polymer on loess for subgrade

Yue,

Zhang,

Zhang

et al. 2024

Sci Rep

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The effects of moisture and drying shrinkage can lead to uneven settlement, cracking, and other diseases in loess subgrade. The objective of this study was to investigate the effects of amide polymer (AP) on the permeability, mechanical properties and crack resistance of loess by orthogonal experiments. The basic properties of AP and the permeability, mechanical properties, and dry–wet variation properties of polymer-modified loess were tested, and a scale model verification and simulation analysis were conducted. In this paper, water migration in subgrade is regulated by improving the water sensitivity of loess. By reducing the variation range of subgrade water content, the stress accumulation in subgrade caused by water is weakened. The results show that the curing time and mechanical properties of AP are directly affected by the oxidant and reducing agent, and the mechanical properties of AP are compatible with the characteristics of loess. AP filled the grain gap and reduced the permeability of loess by 34.05–280.83%. The ductility of polymer-modified loess is significantly increased, and the strain of peak strength is increased by 17.21–126.36%. AP can regulate moisture change, reduce the surface tension between particles, and reduce stress concentration. The strength loss rate was reduced by 19.98–51.21% by enhancing the cracking resistance and weakening the strength loss caused by dry and wet cycling. The increase of upper layer moisture content in the scale model of polymer-modified loess subgrade is reduced by 31.38–36.11%.

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“…The findings demonstrate that lime-treated clay has additional layers of accumulation, altered clay particles, and a higher calcium content at the particle border. By conducting studies on lime-stabilized loess with various moisture levels and temperatures, Bao Weixing [12] looked at the features of lime stability and internal mineral changes at high temperatures. The pozzolanic reaction, crystallization reaction, and lime ripening reaction all contribute to the strength improvement of lime-stabilized loess.…”

Section: Introductionmentioning

confidence: 99%

Effects of Lime Content on Road Performance of Low Liquid Limit Clay

Zhang

Peng

et al. 2023

Applied Sciences

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Low liquid limit clay has a low plastic index, displays poor strength, and is sensitive to water, and its mechanical qualities decline as the water content changes, making it difficult to employ directly in the construction process. Adding lime is a fantastic way to improve it. The influence of lime concentration on the road performance of low liquid limit clay is investigated in this research using a limit water content test, compaction test, and California bearing ratio test. The results show that the original plain soil does not meet the requirements of highway subgrade filling, and the basic properties of subgrade soil are improved to varying degrees after adding lime, resolving the problem regarding the original well-cultivated soil’s inability to meet the requirements of construction. The plastic limit of the improved soil increased by roughly 3% as the lime content increased, but the maximum dry density decreased dramatically by 9.03%, 5.71%, and 5.98%, respectively. With an increase of 57.3% in lime content and compaction times, the California bearing ratio increases dramatically. The ideal moisture content rises as the lime content rises. The optimal dosage is 6%, according to a rigorous study of several performance metrics.

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Experimental study on strength characteristics and internal mineral changes of Lime-stabilized loess under High-Temperature

Cited by 7 publications

References 38 publications

Pollution characteristics and Groundwater ion source analysis of the last 20 years in a semi-arid region of northwest China

Pollution characteristics and Groundwater ion source analysis of the last 20 years in a semi-arid region of northwest China

Experimental investigation of influence of amide polymer on loess for subgrade

Effects of Lime Content on Road Performance of Low Liquid Limit Clay

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