Effects of salts and organic matter on Atterberg limits of dredged marine sediments

Zentar, R.; Abriak, N.-E.; Dubois, Vincent

doi:10.1016/j.clay.2008.04.003

Cited by 64 publications

(27 citation statements)

References 15 publications

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“…Our findings clearly demonstrated that the plasticity index of subsoil layers was significantly lower (P < 0.01) than that of topsoil layers in the different weathering profiles, implying that the content of fine particles in the soil gradually decreased with soil depth. Previous studies about soil texture classification are frequently based on soil plasticity index: a soil with a value between 10 and 17 % is defined as silty clay and that with a value greater than 17 % is classified as clay (Zentar et al, 2009;Marek et al, 2015). Based on this classification theory, most topsoil layers in the TC, GX, AX and WH collapsing gullies can be defined as clay, while the subsoil layers can be classified as silty clay, which is more susceptible to erosion.…”

Section: Soil Plasticity Index and Liquidity Indexmentioning

confidence: 99%

Soil Atterberg limits of different weathering profiles of the collapsing gullies in the hilly granitic region of southern China

et al. 2017

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Abstract. Collapsing gullies are one of the most serious soil erosion problems in the tropical and subtropical areas of southern China. However, few studies have been performed on the relationship of soil Atterberg limits with soil profiles of the collapsing gullies. Soil Atterberg limits, which include plastic limit and liquid limit, have been proposed as indicators for soil vulnerability to degradation. Here, the soil Atterberg limits within different weathering profiles and their relationships with soil physicochemical properties were investigated by characterizing four collapsing gullies in four counties in the hilly granitic region of southern China. The results showed that with the fall of weathering degree, there was a sharp decrease in plastic limit, liquid limit, plasticity index, soil organic matter, cation exchange capacity and free iron oxide. Additionally, there was a gradual increase in liquidity index, a sharp increase in particle density and bulk density followed by a slight decline, a decrease in the finer soil particles, a noticeable decline in the clay contents, and a considerable increase in the gravel and sand contents. The plastic limit varied from 19.43 to 35.93 % in TC, 19.51 to 33.82 % in GX, 19.32 to 35.58 % in AX and 18.91 to 36.56 % in WH, while the liquid limit varied from 30.91 to 62.68 % in TC, 30.89 to 57.70 % in GX, 32.48 to 65.71 % in AX and 30.77 to 62.70 % in WH, respectively. The soil Atterberg limits in the sandy soil layers and detritus layers were lower than those in the surface layers and red soil layers, which results in higher vulnerability of the sandy soil layers and detritus layers to erosion and finally the formation of the collapsing gully. The regression analyses showed that soil Atterberg limits had significant and positive correlation with SOM, clay content, cationic exchange capacity and Fe d , significant and negative correlation with sand content and no obvious correlation with other properties. The results of this study revealed that soil Atterberg limits are an informative indicator to reflect the weathering degree of different weathering profiles of the collapsing gullies in the hilly granitic region.

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Section: Soil Plasticity Index and Liquidity Indexmentioning

confidence: 99%

Soil Atterberg limits of different weathering profiles of the collapsing gullies in the hilly granitic region of southern China

et al. 2017

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“…Dans cette étude, la mesure de la limite de liquidité a été effectuée au travers de l'essai au cône comme définis respectivement dans la norme française NF P 94-052-1 (1995) et la norme anglaise BS1377-2 (1990). La limite de plasticité a été approchée par l'esti mation de la teneur en eau pour laquelle une pénétra tion de 1,7 mm et 2 mm est enregistrée respectivement en adéquation avec les travaux de Feng (2000) et Zentar et al (2009). Sur la figure 3, la variation de la teneur en eau en fonction de la pénétration du cône est présen tée.…”

Section: Caractérisation Des Sédimentsunclassified

Estimation des propriétés mécaniques à long terme des sédiments de Dunkerque traités à la chaux ou au ciment

2013

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Estimation of long-term mechanical properties of Dunkerque sediments treated with lime or cement AbstractThe present work in this paper aims to make up the lack of information concerning the evolution of long-term mechanical properties of sediments treated with lime and/or cement. The unconfined compression tests and indirect tensile tests are performed to determine the compressive strength and tensile strength of sediments at different curing times and in particular at 360 days. The tensile strength and elastic modulus measured at 360 days allows evaluating the potential use of designed materials in base course layer. The strength ratios Rtd/Rt360d and modulus ratios Etd/Et360d are experimentally calculated and then compared to those recommended by French standard NF P 98-113 (1994) and NF P 98 114-3 (2001) for standard materials. With the exception of SD6L, the obtained values are slightly below the proposed values for estimating the tensile strengths of materials at 360 days but always above the proposed values for estimating elastic modules at 360 days.

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“…Their study results show that seawater effect becomes significant when liquid limit, plasticity and shrinkage indices are more than 110%, 70% and 104%, respectively. Zentar et al (2009) examines the effects of treatments inducing the reduction of salts and the organic content on the Atterberg limits of marine dredged sediments. According to Zentar et al (2009) the liquid limits as the plasticity indexes decrease with reducing the organic content in the sediments.…”

Section: Introductionmentioning

confidence: 99%

“…Zentar et al (2009) examines the effects of treatments inducing the reduction of salts and the organic content on the Atterberg limits of marine dredged sediments. According to Zentar et al (2009) the liquid limits as the plasticity indexes decrease with reducing the organic content in the sediments. Palomino et al (2011) stated that the NaCl concentration of the aqueous solution did impact the plasticity of the pure kaolin.…”

Section: Introductionmentioning

confidence: 99%

Optimization of consistency limits and plasticity index of fine-grained soils modified with polypropylene fibers and additive materials

2015

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It is a well-known fact that water content has a significant effect on the engineering properties of fine-grained soils. There is a close relationship between consistency limits and geotechnical parameters of fine-grained soils. This experimental study was performed to investigate the effect of randomly distributed polypropylene fibers (PP) and some additive materials [e.g., Borogypsum (BG), Fly Ash (FA) and Cement (C)] on consistency limits and plasticity index of a fine-grained soil. The Taguchi method was applied to the experiments and standard L9 Orthogonal Array (OA) with four factors and three levels were chosen. A series of consistency limits were conducted on each specimen. 0-20% BG, 0-20% FA, 0-0.25% PP and 0-3% of C by total dry weight of mixture were used in the preparation of specimens. In the tests, distilled water (DW), DW + 0.05% Air-Entrainer (AE) and DW + 0.15% AE were used as mixture liquid. Experimental results showed that the most effective material for decreasing the liquid limit and plasticity index of the samples were fly ash, polypropylene fiber respectively. The plasticity index decreased with increasing of AE. The values of plasticity index for distilled water, distilled water + 0.05% air-entrainer and distilled water + 0.15% air-entrainer in optimum conditions were 16%, 14% and 8%, respectively.

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Effects of salts and organic matter on Atterberg limits of dredged marine sediments

Cited by 64 publications

References 15 publications

Soil Atterberg limits of different weathering profiles of the collapsing gullies in the hilly granitic region of southern China

Soil Atterberg limits of different weathering profiles of the collapsing gullies in the hilly granitic region of southern China

Estimation des propriétés mécaniques à long terme des sédiments de Dunkerque traités à la chaux ou au ciment

Optimization of consistency limits and plasticity index of fine-grained soils modified with polypropylene fibers and additive materials

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