Effects of natural fiber inclusions and pre-compression on the strength properties of lime-fly ash stabilised soil

Kafodya, Innocent; Okonta, Felix

doi:10.1016/j.conbuildmat.2018.02.194

Cited by 46 publications

(16 citation statements)

References 48 publications

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“…For instance, usage of FA as the precursor for geopolymerisation would help lower the raw material cost significantly, since FA is one of the most abundant waste materials from manufacturing industries today, being continuously produced owing to the increase in energy and infrastructure in urban areas [40]. Several authors in the past, such as Kafodya and Okonta [41], Tan et al [42] have explicitly highlighted the advantage of FA's low cost as a binder. Hence, as compared to chemical stabilization of soil using raw materials such as cement/ lime, FA-based geopolymer stabilization of soil would be relatively inexpensive [41].…”

Section: Combined Effect Of Geopolymer Stabilization and Geotextile Rmentioning

confidence: 99%

“…Several authors in the past, such as Kafodya and Okonta [41], Tan et al [42] have explicitly highlighted the advantage of FA's low cost as a binder. Hence, as compared to chemical stabilization of soil using raw materials such as cement/ lime, FA-based geopolymer stabilization of soil would be relatively inexpensive [41]. Moreover, the use of geosynthetics, such as geotextiles for reinforcements have also been referred to as "cost-effective" by many authors in the past [43,44].…”

Section: Combined Effect Of Geopolymer Stabilization and Geotextile Rmentioning

confidence: 99%

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Strength Enhancement of Geotextile-Reinforced Fly-Ash-Based Geopolymer Stabilized Residual Soil

Jayawardane

Anggraini

Li-Shen

et al. 2020

Int. J. of Geosynth. and Ground Eng.

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Soils in their natural form are often deemed unsatisfactory to be directly used as a construction material for their respective applications. Under such circumtances, employment of ground improvement techniques to better suit the soil for its function is typically the most economical approach. Consequently, the present research investigated into the beneficial effect of modernized soil treatment techniques, i.e., geopolymer stabilization using fly ash as the precursor and geotextile reinforcement, on the strength enhancement of natural residual soil. A series of unconsolidated undrained (UU) triaxial compression tests were carried out to assess variation of geopolymer stabilized residual soil strength based on the varying number of geotextile layers, geotextile arrangement, and confining pressures. It was found that the increase in the number of geotextile layers resulted in a corresponding rise in soil strength and stiffness. It was also discovered that placement of geotextile layers at sample regions which suffered the maximum tensile stress-strain during loading was more effective compared to random placement. Soil strength was observed to reduce with increasing confining pressure which demonstrated the effectiveness of utilizing geotextile reinforcement at greater depths below the ground to be less. Failure patterns showed that while unreinforced soil resulted in failure along a shear plane at an approximate angle of 45 + φ/2 (φ: angle of internal friction), reinforced samples demonstrated a bulging failure where the soil between adjacent layers of geotextiles appeared to bulge. The findings deemed the employment of geopolymer stabilization and geotextile reinforcement on natural residual soil very effective with regards to the enhancement of soil strength and stiffness.

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Section: Combined Effect Of Geopolymer Stabilization and Geotextile Rmentioning

confidence: 99%

Section: Combined Effect Of Geopolymer Stabilization and Geotextile Rmentioning

confidence: 99%

Strength Enhancement of Geotextile-Reinforced Fly-Ash-Based Geopolymer Stabilized Residual Soil

Jayawardane

Anggraini

Li-Shen

et al. 2020

Int. J. of Geosynth. and Ground Eng.

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“…The main effects of these treatments are relatively well characterised. Several authors (Bell, 1996;Brandl, 1981;Kafodya and Okonta, 2018;Little, 1995) showed that lime treatment improves the soil workability as well as the soil strength and elastic modulus. Lime can also have an impact on the hydraulic conductivity of soils depending on the compaction conditions (Le Runigo et al, 2009;McCallister and Petry, 1991), limit the swelling potential of expansive soils (Nalbantoglu and Tuncer, 2001;Stoltz et al, 2012), or improve soil resistance to erosion (Chevalier et al, 2012;Mehenni et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Alteration of the Hydromechanical Performances of a Stabilized Compacted Soil Exposed to Successive Wetting–Drying Cycles

Cuisinier

Masrouri

Mehenni

2020

J. Mater. Civ. Eng.

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This study intends to examine the impact of successive wetting and drying cycles on the strength and the hydraulic conductivity of lime and cement treated soil, with a special emphasis on the protocol that is employed to impose the cycles. Compacted specimens were cured for 90 days before being exposed to different numbers of wetting and drying cycles. These cycles were imposed to treated samples with two protocols. The first one is based on oven drying and full saturation, while the second one is based on the control of the relative humidity of the samples at room temperature, to thus obtain more realistic conditions for the wetting and drying cycles. The unconfined compressive strength and saturated hydraulic conductivity were monitored as a function of the number of cycles. The results highlight the role of the imposed wetting and drying cycles technique for a better assessment of the long term performances of treated soils. A special attention was also taken to evaluate the relationship between the alteration of hydraulic conductivity and mechanical strength as a function of the number of applied wetting and drying cycles. The results showed that the degradation of the strength of the treated samples is associated to a significant increase of their hydraulic conductivity as a function of the number of cycles.

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“…A prática do reuso de resíduos em misturas com solo é bastante difusa no meio cientifico e envolve estudos com os mais variados tipos de matéria prima, com características distintas, como no caso de Ahmed et al (2011) que avaliou misturas de solo com resíduos de gesso, ou Kafodya et al (2018) que estou misturas de solo-fibra, e também Wei et al (2018) que desenvolveu análises de misturas solo com fibra e cal, e Machado et al (2012) que avaliou as propriedades da mistura solo-grits, etc.…”

Section: Introductionunclassified

Avaliação Da Resistência De Misturas De Solo Residual De Basalto Com Resíduos De Microesferas De Vidro

Xavier

Menegotto

Boehl

2019

HOLOS

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As microesferas de vidro são materiais abrasivos de granulometria fina, comumente utilizadas em atividades industriais para a limpeza e o polimento das peças metálicas. Após a sua utilização, geralmente, são dispostas em aterros de resíduos industriais. O presente estudo buscou uma alternativa de reaproveitamento deste material, realizando uma avaliação do desempenho mecânico de um solo residual de basalto após a adição de diferentes teores de resíduos de microesferas de vidro. Inicialmente, foram realizados ensaios de caracterização das microesferas de vidro e as diversas misturas foram submetidas aos ensaios de compactação, de cisalhamento direto e de índice de suporte Califórnia (ISC). Concluiu-se que o resíduo não atua como um agente na melhoria do solo, pois de maneira geral, as resistências das misturas foram inferiores em relação às determinadas para o solo puro e resíduo puro. Entretanto, as misturas apresentaram ângulos de atrito interno superiores ao do solo puro, sendo o maior valor apresentado pela mistura com teor de resíduos de 20%. No ensaio de ISC, a mistura que apresentou melhor resultado, em relação ao resíduo puro, foi a com 10% de microesferas de vidro.

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Effects of natural fiber inclusions and pre-compression on the strength properties of lime-fly ash stabilised soil

Cited by 46 publications

References 48 publications

Strength Enhancement of Geotextile-Reinforced Fly-Ash-Based Geopolymer Stabilized Residual Soil

Strength Enhancement of Geotextile-Reinforced Fly-Ash-Based Geopolymer Stabilized Residual Soil

Alteration of the Hydromechanical Performances of a Stabilized Compacted Soil Exposed to Successive Wetting–Drying Cycles

Avaliação Da Resistência De Misturas De Solo Residual De Basalto Com Resíduos De Microesferas De Vidro

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