Behavior of Chemically Stabilized Sulfate-Rich Expansive Clay under Quick-Aging Environment

Hoyos, Laureano R.; Laikram, Arthit; Puppala, A. J.

doi:10.1061/40864(196)13

Cited by 4 publications

(4 citation statements)

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“…The soil stabilization technique has been used in civil engineering applications, such as road construction, foundation and embankment, with the main objective of improving the microstructural behavior and mechanical performance of natural soils [1][2][3][4]. The bearing capacity of soil can be improved by physical treatments, such as particle size distribution [5][6][7], and chemical treatments through the reaction of soil components with a stabilizing material, traditionally lime or Portland cement [8][9][10][11]. However, highly alkaline industrial wastes can produce cementitious properties similar to those of Portland cement, exhibiting the potential to partially or even totally replace conventional materials [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

et al. 2023

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This study evaluates a binary mixture of fly ash and lime as a stabilizer for natural soils. A comparative analysis was performed on the effect on the bearing capacity of silty, sandy and clayey soils after the addition of lime and ordinary Portland cement as conventional stabilizers, and a non-conventional product of a binary mixture of fly ash and Ca(OH)2 called FLM. Laboratory tests were carried out to evaluate the effect of additions on the bearing capacity of stabilized soils by unconfined compressive strength (UCS). In addition, a mineralogical analysis to validate the presence of cementitious phases due to chemical reactions with FLM was performed. The highest UCS values were found in the soils that required the highest water demand for compaction. Thus, the silty soil added with FLM reached 10 MPa after 28 days of curing, which was in agreement with the analysis of the FLM pastes, where soil moistures higher than 20% showed the best mechanical characteristics. Furthermore, a 120 m long track was built with stabilized soil to evaluate its structural behavior for 10 months. An increase of 200% in the resilient modulus of the FLM-stabilized soils was identified, and a decrease of up to 50% in the roughness index of the FLM, lime (L) and Ordinary Portland Cement (OPC)-stabilized soils compared to the soil without addition, resulting in more functional surfaces.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

et al. 2023

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“…In fact, lime-fiber, cement kiln dust, granulated blast furnace slag and fly ash have been used to partially substitute lime or cement, two widely used calcium-based soil stabilizers (Wild et al, 1999;Puppala et al, 2003;Hoyos et al, 2006;Solanki et al, 2009;Celik and Nalbantoglu, 2013). However, without altering the calciumbased nature and stabilization mechanism, these stabilization technologies have not effectively addressed the swelling issues for sulfatebearing soils.…”

Section: Introductionmentioning

confidence: 95%

“…Significant effort has been devoted to explore and develop new technologies for stabilizing sulfate-rich soils (Puppala et al, 2004;Hoyos et al, 2006). In fact, lime-fiber, cement kiln dust, granulated blast furnace slag and fly ash have been used to partially substitute lime or cement, two widely used calcium-based soil stabilizers (Wild et al, 1999;Puppala et al, 2003;Hoyos et al, 2006;Solanki et al, 2009;Celik and Nalbantoglu, 2013).…”

Section: Introductionmentioning

confidence: 99%

Calcium-free geopolymer as a stabilizer for sulfate-rich soils

Zhang

Zhao

Zhang

et al. 2015

Applied Clay Science

102

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“…Expansive soils are prevalent in different parts of the world and cause moderate to severe damage to overlying infrastructures ( 1 , 2 ). These soils are vulnerable to extensive swelling and shrinkage strains from moisture-induced fluctuations ( 3 – 6 ). For the past several decades, traditional calcium (Ca)-based stabilizers such as lime has been used to enhance the engineering properties of these soils and mitigate the problems associated with moisture fluctuations ( 7 , 8 ).…”

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confidence: 99%

Evaluation of Geopolymer for Stabilization of Sulfate-Rich Expansive Soils for Supporting Pavement Infrastructure

Jang

Biswas

Puppala

et al. 2022

Transportation Research Record: Journal of the Transportation R

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Stabilization of sulfate-rich expansive subgrade soils is a persistent cause of concern for transportation infrastructure engineers and practitioners. The application of traditional calcium-based stabilizers is generally not recommended for treating such soils because of the formation of deleterious reaction products such as ettringite. Sulfate-induced heaving causes severe structural damage to pavements and accounts for enormous expenditure from routine maintenance and rehabilitation activities. A research study was undertaken to evaluate the feasibility of using a metakaolin-based geopolymer (GP) for the treatment of sulfate-rich expansive soil. Laboratory studies were conducted on natural soil and artificially sulfate-rich soils, when treated with either lime or GP, to evaluate and compare the improvements in the engineering properties, including unconfined compressive strength, swelling and shrinkage, and resilient moduli characteristics over different curing periods. Microstructural studies, such as field emission scanning electron microscopy and X-ray diffraction, were performed on treated soils to detect the formation of reaction products. The engineering studies indicate that GP treatment enhanced strength and resilient moduli while suppressing ettringite formation and the associated swell–shrink potential of the treated soils. The microstructural studies showed that GP gels contribute to the improvement of these engineering properties through the formation of a uniform geopolymer matrix. In addition, the absence of a calcium source suppressed the formation of ettringite in the GP-treated soils. Overall, the findings indicate that GPs could be used as a potential alternative to existing traditional stabilizers for treating sulfate-rich expansive soils.

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Behavior of Chemically Stabilized Sulfate-Rich Expansive Clay under Quick-Aging Environment

Cited by 4 publications

References 0 publications

Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

Evaluation of the Effect of Binary Fly Ash-Lime Mixture on the Bearing Capacity of Natural Soils: A Comparison with Two Conventional Stabilizers Lime and Portland Cement

Calcium-free geopolymer as a stabilizer for sulfate-rich soils

Evaluation of Geopolymer for Stabilization of Sulfate-Rich Expansive Soils for Supporting Pavement Infrastructure

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