Treatment of Collapsible Soils by Additions of Granulated Slag and Natural Pozzolan

Ziani, Hocine; Abbèche, Khelifa; Messaoudene, Idris; Pais, Luís José Andrade

doi:10.1007/s12205-019-0051-0

Cited by 20 publications

(11 citation statements)

References 15 publications

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“…However, for 15% of stabilizer and Ec=60 blows, a decrease in CP was noticed from 75.69% to 68.6%, the soil treated with this amount of stabilizer is considered to cause moderate trouble problems. It is also pointed out that for w=8%, the CP varied from 9.82% for untreated soil and Ec=20 blows, to a value of 0.4% for an addition of 15% and Ec=60blows, based on Jennings and Knight Classification [26] in this part the treated soil is indexed from trouble to no problem. Generally, these results are better than those obtained by Al Shaba et al [39], where they obtained a minimum of CP =5.5%.…”

Section: Influence Of Treatment Content On the Collapse Potentialmentioning

confidence: 94%

“…Another study showed that the additional load and maximum negative skin friction due to the compacting effect of the battered pile, has a negative correlation with the amount of collapse, also the collapsibility rate of loess is affected by natural moisture content and dry density; hence collapse can be improved by an additional loading and a pre-wetting to reduce the harmful effect of the negative friction of the skin on the pile foundations, these results are carried out by Xing et al [24]. Studies evaluate the treatment of this type of soil with a mixture of bentonite and cement [25] or with natural pozzolan and slag mixture [26]. In order to achieve sustainable development, equilibrium must be found between the environmental, economic, social and technological systems and contribute to the maximum growth of these systems.…”

Section: Introductionmentioning

confidence: 99%

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Treatment of Collapsible Soils with Granulated Blast Furnace Slag and Calcined Eggshell Waste

Adjabi

Nouaouria

Djebabla

2021

Civil and Environmental Engineering Reports

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In order to meet environmental and socio-economic challenges, the recycling of waste to be used in the treatment of geotechnical problems is one of the main ways of preserving the environment with a lower economic value. The objective of this experimental work is to improve the characteristics and to study the mechanical behaviour of collapsible soil treated with a new hydraulic stabilizer composed of Crushed Granulated Blast Furnace Slag (CGBS) active by Eggshell Waste (CES). The specimens were mixed with stabilizer content, varying from 0 to 15% in mass, with an initial water content of 4, 6 and 8% respectively. in mass. Oedometer apparatus was used to study the addition of new hydraulic stabilizer effect on the Collapse Potential. Triaxial tests are also conducted to determine the shear strength parameters (cohesion and internal friction angle) of this treated soil. The results of this research study show that the mechanical properties of the treated collapsible soil were significantly improved. An appreciable reduction in the collapse potential is observed. The addition of 15% of this new stabilizer with initial water content of 4% under a compaction of 60 blows/layer is capable of increasing internal friction angle and cohesion. It can be concluded from this study that the mixture of granulated slag and calcined eggshell can be used as an effective treatment of collapsibility phenomenon at low cost while protecting the environment from industrial waste.

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Section: Influence Of Treatment Content On the Collapse Potentialmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Treatment of Collapsible Soils with Granulated Blast Furnace Slag and Calcined Eggshell Waste

Adjabi

Nouaouria

Djebabla

2021

Civil and Environmental Engineering Reports

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“…Special attention is paid to the consideration of the processes in soil medium with the signs of fractal. Thus, studies of the processes of turbulence (Jafari et al, 2019), percolation (Ziani, 2019), peculiarities of soil behaviour within the shear zone (Lu et al, 2018) are carried out on the basis of the fractal theory elements. Wang et al (2015) applied calculations of fractal size to define regularities of spatial changes in the properties of loessial soils to implement innovative recultivation methods.…”

Section: ключові слова: суфозія дніпровський лесовий ґрунт фракталmentioning

confidence: 99%

Forecasting suffusion deformation in dispersive soils

Mokrytskaya¹,

Nosova²

2019

Journ. Geol., Geogr., and Geoec..

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Suffusion is a dangerous geological process accompanied by the formation of sinkholes, deformations of buildings and structures. Forecast of suffusion processes is a complex scientific problem since it is required to predict a complex process of the formation of new soil structure experiencing certain changes while interacting with the flow. Durin the period of 12.02.2018 – 13.04.2018, a sample of Dnipro loessial soil was filtered with the salt solution in Darcy device. The experi- ment was carried out at the SRI of Geology of Oles Honchar DNU; it is the continuation of the research dealing with experimental study of the dispersive soils as complex natural systems. To study suffusion process in loessial soils, analysis of microaggregate and granulometric composition of a sample of undisturbed structure of Dnipro loessial horizon taken in Tunelna ravine outcrop has been performed. The sample was studied in different states: natural and changed (due to long-term filtration) ones. Results of the use of in- novative method to determine values of the function of particle distribution in terms of their mass and calculations of fractal dimension of the function basing upon the microaggregate analysis have made is possible to forecast values of porosity coefficient and volumetric deformation corresponding to the new quality standards of a complex system – dispersive soil in the state of complete microaggregate disturbance. Algorithm of the microaggregate composition analysis according to the methodology (Riashchenko, 2010) is in the fact that the sample experiences different methods of preparation – thus, evaluations of soil dispersivity are different. Basing upon the obtained results, values of microaggregate coefficient have been calculated, and data on the number of aggregates and initial particles have been taken. It has been determined that the basic size of the aggregates is 0.01-0.005 mm; there is a fewer share of the aggregates of 0.05-0.01 mm; and the fewest share of the aggregates is represented by fine fraction. That indicates the changes in microaggregate composition of soil due to the carrying out of fine fractions and the disturbance of larger aggregates. Calculations of the values of volu- metric soil deformation due to long-term salt solution filtration emphasize the fact that within the zones of technogenic contamination, possible aggregate decay due to chemical effect will result in the formation of structure with denser particle packing, i.e. compaction. If loessial layers with the state changed due to salt solution filtration are subject to mechanical effect, drastic soil loosening and loss of soil stability may be observed.

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“…A análise dos resultados mostrou o efeito do peso unitário inicial do solo e da porcentagem dos aditivos relacionados ao peso sobre o potencial de colapso (CP), e concluíram que os resultados obtidos foram positivos na utilização do pó de ferro no tratamento de solos colapsíveis e consequentemente na redução do recalque de colapso esperado. Ziani et al (2019) fizeram testes para examinar o efeito da adição de escória granulada e pozolana natural, em diferentes teores, na sucção e no potencial de colapso de um solo reconstituído em laboratório, e com comportamento semelhante aos solos naturais. Os resultados obtidos mostraram claramente que solos colapsíveis tratados com escória granulada e pozolana natural levam a uma redução significativa do potencial de colapso, seguido de uma diminuição da sucção.…”

Section: Introductionunclassified

“…Quanto às técnicas utilizadas, é preciso esclarecer que são resultado de longos anos de pesquisas, e da experimentação de profissionais da área de Construção Civil, e, quando executadas de forma correta, possibilitam o ganho de capacidade de carga e redução de recalques, decorrente da execução dos elementos de reforço. Foi possível constatar que dentre as técnicas utilizadas, por profissionais da área tanto no Brasil quanto eu outras regiões do mundo, estão: o uso de estacas (LOLLO, 2008;SOUZA, 2008) ; o uso de mistura de pó de ferro (ALSHABA; ABDELAZIZ, RAGHEB, 2018), a compactação utilizando sonda vibratória (GAO et al, 2020), levando a compressão do solo; uso de misturas de polietilenoglicol (PEG) / nanolima (ZIMBARDO et al, 2020); uso de misturas de nanomateriais (nano-sílica, nano-argila e nano-carbonato de cálcio) (HAERI; VALISHZADEH, 2021); adição de escória granulada e pozolana natural (ZIANI et al (2019); execução de colunas de solo laterítico compactado, inseridas na camada colapsível (FREITAS, 2016); uso de soluções aquosas aglomerantes (SOFT SOIL GROUP, 2015); e sugestão de medidas estruturais para evitar a ocorrência ou reduzir a magnitude dos processos geológicos, e de medidas não estruturais de caráter extensivo OLIVEIRA, 2008).…”

Section: Introductionunclassified

Solos Colapsíveis - Riscos E Soluções Tecnológicas

Trevisoli¹,

Marco

Florian³

2021

RECIMA21

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Alguns solos podem apresentar variação de volume quando da mudança de umidade, podendo resultar em danos como trincas, fissuras e rupturas nas estruturas da edificação. O objetivo deste estudo foi apresentar os principais riscos em construir fundações em solos colapsíveis e relacionar possíveis soluções tecnológicas. A metodologia do estudo é de revisão bibliográfica, com análise de documentos recuperados em fevereiro de 2021, nas bases de dados Scielo, Scopus e Google acadêmico, e tem como natureza a pesquisa qualitativa. Os resultados comprovam sobre a necessidade de análise do solo antes do início da construção, como forma de buscar soluções que minimizem os danos futuros. Quanto as técnicas para essa correção, a literatura tem apresentado o uso de estacas; o uso de mistura de pó de ferro; a compactação utilizando sonda vibratória, levando a compressão do solo; uso de misturas de polietilenoglicol (PEG) / nanolima; uso de misturas de nanomateriais (nano-sílica, nano-argila e nano-carbonato de cálcio) ; adição de escória granulada e pozolana natural; execução de colunas de solo laterítico compactado, inseridas na camada colapsível; uso de soluções aquosas aglomerantes; e sugestão de medidas estruturais para evitar a ocorrência ou reduzir a magnitude dos processos geológicos, e não estruturais de caráter extensivo, contemplando grandes áreas. Concluímos que a literatura tem apresentado soluções que viabilizam a utilização deste tipo de solo, podendo com a pré análise do solo, garantir a minimização de riscos estruturais às edificações.

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Treatment of Collapsible Soils by Additions of Granulated Slag and Natural Pozzolan

Cited by 20 publications

References 15 publications

Treatment of Collapsible Soils with Granulated Blast Furnace Slag and Calcined Eggshell Waste

Treatment of Collapsible Soils with Granulated Blast Furnace Slag and Calcined Eggshell Waste

Forecasting suffusion deformation in dispersive soils

Solos Colapsíveis - Riscos E Soluções Tecnológicas

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