Effects of additives on the microstructure of clay

Ural, Nazile

doi:10.1080/14680629.2015.1064011

Cited by 19 publications

(7 citation statements)

References 22 publications

(24 reference statements)

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“…Lime treatment is usually used to improve the mechanical properties of fine-grained soils (Little, 1995;Prusinski & Bhattacharja, 1999;Parsons & Milburn, 2003;Al-Mukhtar et al, 2010;Tang et al, 2011;Wang et al, 2019). Actually, lime treatment of fine-grained soil creates cementitious compounds from pozzolanic reaction, coating the soil particles and bonding them together (Al-Mukhtar et al, 2012;Tran et al, 2014;Wang et al, 2015;Ural, 2016;Wang et al, 2016;Wang et al, 2017). In addition, the improvement depends on both lime content and curing time (Bell, 1996).…”

Section: Introductionmentioning

confidence: 99%

Effect of freeze-thaw cycles on mechanical strength of lime-treated fine-grained soils

Nguyen

Cui

Ferber³

et al. 2019

Transportation Geotechnics

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Lime treatment is a widely-used technique for the stabilization and improvement of finegrained soils in earthworks for transportation. In cold regions, lime treatment can be considered as an appropriate method to improve freeze-thaw resistance of fine-grained soils. The effectiveness of treatment can depend on soil nature, lime dosage and curing time. In the present work, three soils (silt of low plasticity, clay of low plasticity, and silt of high plasticity) were treated at three lime contents (lower, equal and higher than the lime fixation point) at four curing periods (7, 28, 90 and 365 days). The mechanical strength was determined from unconfined compression test performed on specimens having a diameter of 100 mm and a height of 100 mm. Freeze-thaw cycles were applied by varying the specimen temperature between-20°C and 20 °C, the specimens being beforehand saturated. The mechanical strength of specimen subjected to ten freeze-thaw cycles was compared to those maintained in laboratory temperature (20 °C). Results showed that freeze-thaw cycles significantly decrease the mechanical strength of sample. This decrease can be explained by damage induced by ice lenses formation/thawing during freeze-thaw cycles, as illustrated by the observation at X-ray computed tomography. Interestingly, lime treatment mitigates this damage and increase the soil freeze-thaw resistance. The treatment appears more efficient for lower plasticity soil, a higher lime content, and a longer curing time. This conclusion seems depend on the specimen preparation procedure.

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Section: Introductionmentioning

confidence: 99%

Effect of freeze-thaw cycles on mechanical strength of lime-treated fine-grained soils

Nguyen

Cui

Ferber³

et al. 2019

Transportation Geotechnics

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“…Similar works carried out by foreign researchers in particular dealing with the stabilization of clay soils of lowintensity roads with ash from burning coal are described in the following scientific paper [13]. A significant economic effect from the use of such design solutions is obvious.…”

Section: Introductionmentioning

confidence: 79%

“…Separately, a very promising direction of research which should be noted associated with the strengthening of soil foundations based on the use of cohesive soils with a compaction factor of 1.05 and higher. It is known that clay soils cause significant problems in road construction [13]. The use of repacking technology can significantly reduce the cost of building and maintaining the road pavement due to an obstacle to a capillary ascension of water [14].…”

Section: Introductionmentioning

confidence: 99%

Economic efficiency growth of agricultural roads’ construction in the region

Skorobogatchenko¹,

Viselskiy²,

Borovik³

et al. 2019

Proceedings of the Volgograd State University International Scientific Conference "Competitive, Sustainable and Safe Developmen

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The paper is devoted to the technical and economic justification of the automobile road construction of low intensity roads. The design choice offered for comparison presents the construction of roadway surfacing in which the role of the broken stone underlayer is carried out by over-compacted fine soil. In the Volgograd region fine loamy soils (sandy soils, clayly soils) occupy a considerable part of the surface. In this respect the technical and economic justification of the construction of automobile roads for agriculture with the use of over consolidated fine soils of such type in the road construction has a significant social and economic importance. The offered technique of technical and economic justification is founded on the calculation of an actual durability of road constructions using the forecasting of lineal evenness change. The technique of forecasting is based on the improvement of a well known linear multi factor model of the international roughness index (IRI) which forecasts changes in dependence of traffic density and initial state of roadway surfacing due to the inclusion of additional factors into the model. It is suggested to use as factors the data about the qualitative content of traffic load, specifically about the level of impact of heavy cargo vehicles, weather and climate effect on the surfacing and on the quality of automobile road maintenance. The experimental data were subjected to multivariate regression analysis in Excel. In compliance with the data of the test of a trial pavement section constructed in the Bykovskiy district of the Volgograd region, the authors calculated the economic efficiency of the automobile road construction of the offered construction type. The conclusion is drawn on the technical and economic expediency of use of the suggested design solution. Keywords -forecasting of road surfacing evenness, automobile roads, international roughness index (IRI), multivariate regression analysis, over-compacted soil, assessment of economic efficiency of design solutions.

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“…The XRD and SEM analyses of compacted samples were performed. It was found that an increase in lime and cement content led to a more refined pore structure and this refinement increased with the increase in the curing period (Ural, 2016). Bhardwaj and Sharma (2020) tested natural soil at a depth of 1-1.5 meters from the ground surface with and without the addition of lime.…”

Section: Background Of Theorymentioning

confidence: 99%

“…The use of mineral additives to this type of soil can alleviate these problems. Ural (2016) examined the performance of clay when adding lime, cement and FA or other waste materials. The XRD and SEM analyses of compacted samples were performed.…”

Section: Background Of Theorymentioning

confidence: 99%

Waste utilization to enhance performance of road subbase fill

Onturk

Fırat

Yilmaz

et al. 2021

JEDT

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Purpose The purpose of this study is to use waste materials in construction to create sustainable practices. This will contribute towards circular economy which has gained momentum in recent years throughout the world. Design/methodology/approach Waste materials cause enormous environmental problems that can have an adverse effect on the environment. Recycling of waste consists an important part of the circular economy. Therefore, researchers have been investigating the economic use of a variety of waste materials for reducing their environmental impact. One potential usage is in road subbase fill materials where wastes can be incorporated in large quantities. In this study, the engineering properties of road subbase fill materials (i.e. kaolinite) mixed with Granite Waste (GW), coal Fly Ash (FA) and lime are investigated. Kaolinite was replaced with 15% lime and FA, whereas the GW replacement varied from 10% to 20%. Testing included strength of the various soil compositions subjected to different curing times. Also the microstructural analyses and phase changes of samples were conducted using scanning electron microscopy and x-ray diffraction techniques, respectively. The results obtained indicate that GW can be incorporated in road base materials to improve its bearing capacity. The mixture consisting of 15% lime, 15% FA, 20% GW and 50% kaolinite resulted in maximum dry unit weight and optimum moisture content. Using GW exhibited a noticeable increase in the California Bearing Ratio of more than eight times at 1 day and 28 days curing regime compared with the control sample. Findings This study shows that GW and FA can be used for road subbase materials and can contribute toward a better and cleaner environment. Originality/value In this study, the engineering properties of road subbase fill materials (i.e. kaolinite) mixed with GW, coal FA and lime are investigated. This are value added in circular economy.

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Effects of additives on the microstructure of clay

Cited by 19 publications

References 22 publications

Effect of freeze-thaw cycles on mechanical strength of lime-treated fine-grained soils

Effect of freeze-thaw cycles on mechanical strength of lime-treated fine-grained soils

Economic efficiency growth of agricultural roads’ construction in the region

Waste utilization to enhance performance of road subbase fill

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