Liquid and plastic limits of clayey, organic C-rich mountain soils: Role of organic matter and mineralogy

Stanchi, Silvia; Catoni, Marcella; D’Amico, Michele; Falsone, Gloria; Bonifacio, Eleonora

doi:10.1016/j.catena.2016.12.021

Cited by 23 publications

(15 citation statements)

References 44 publications

(47 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Based on these findings, it was suggested to sieve samples with the 75‐µm sieve rather than the 425‐µm sieve. Conversely, another study found that the correlations between Atterberg limits and clay and organic carbon content were stronger for the 425‐µm‐sieved samples than the correlations with the 2‐mm‐sieved samples (Stanchi, Catoni, D'Amico, Falsone, & Bonifacio, ).…”

Section: Introductionmentioning

confidence: 94%

“…There were however large discrepancies between the two measures for samples with LL > 36% due to the limits of an agreement which were more than 4%. Also, Stanchi et al (2017) by comparing the relationship between Atterberg limits (LL range from 42 to 58% and PL range from 31 to 61%) and clay fraction in different fraction size (425 µm and 2 mm) stated that the clay content has a strong effect on Atterberg limits in the 425 µm fraction and this relationship is more obvious in this size. Furthermore, Kayabali (2011) measured the Atterberg limits in different particle size (425 and 75 µm) showed that the sample passed through the sieve 75 µm had higher PL and LL compare to sample passed through the sieve 425 µm.…”

Section: Effect Of Particle Size On Ll and Plmentioning

confidence: 99%

See 1 more Smart Citation

Repeatability and agreement between methods for determining the Atterberg limits of fine‐grained soils

Rehman

Pouladi

Pulido-Moncada

et al. 2020

Soil Science Soc of Amer J

View full text Add to dashboard Cite

The Atterberg limits (plastic limit [PL] and liquid limit [LL]) of fine‐grained soils are important for civil engineering and agronomic applications. Several methodologies exist to determine the PL and LL, each with associated merits and shortcomings. The reproducibility and uncertainties associated with the various methods have not been evaluated for different samples that differ in terms of clay mineralogy and geologic origin. The objectives were to (i) assess the repeatability of two methods each for determining the PL (thread rolling and rolling device) and LL (Casagrande cup and drop cone penetrometer), and compare the subsequent plasticity indexes for 30 samples from 10 countries; and (ii) evaluate the effect of particle size (2 mm and 425 µm) on the plastic and liquid limits for 28 Venezuelan samples. For the PL, the repeatability (estimated as the repeatability coefficient, RC, among replications) for the thread rolling and rolling device methods was similar (2.28 and 2.39%, respectively). For the LL, the drop cone method was 16% more repeatable than the Casagrande cup method. There was a strong correlation between the two respective methods for PL (r2 = 0.98) and LL (r2 = 0.99). For samples that have LL < 45, the LL from the Casagrande cup was slightly higher than LL from the drop cone, and vice versa for samples with LL > 45%. No significant differences were observed between PL measured on <2‐mm or <425‐µm samples; for samples with LL < 35% the two particle sizes gave similar values. There were however larger discrepancies between the two particle sizes for samples with LL > 36%.

show abstract

Section: Introductionmentioning

confidence: 94%

Section: Effect Of Particle Size On Ll and Plmentioning

confidence: 99%

Repeatability and agreement between methods for determining the Atterberg limits of fine‐grained soils

Rehman

Pouladi

Pulido-Moncada

et al. 2020

Soil Science Soc of Amer J

View full text Add to dashboard Cite

show abstract

“…Contrary to those researchers, Keller and Dexter 17 reported a weak positive correlation between SOM and LL/PL, while there was no significant effect of SOM on PI for agricultural soils covering a wide range of soil types in many countries. Stanchi et al 37 found no correlation between LL, PI and the SOM content, while they observed a positive relationship between PL and SOM of clayey, organic C-rich mountain soils in the Ligurian Alps (NW-Italy).…”

Section: Som (G Kgmentioning

confidence: 98%

The conversion of forestland into agricultural land without appropriate measures to conserve SOM leads to the degradation of physical and rheological soil properties

Tolimir

Kresović

Životić

et al. 2020

Sci Rep

View full text Add to dashboard Cite

This study was conducted to compare soil particle density (ρ s), soil total porosity (TP), liquid limit (LL), plastic limit (PL), and plasticity index, and their relations with soil organic matter (SOM), of non-carbonate silty clay Fluvisols under different land uses. Three neighboring land uses were studied: native deciduous forest, arable land, and meadow, managed in the same way for more than 100 years. Soil was collected from 27 soil profiles and from three depths (0-15, 15-30 and 30-45 cm). Land use caused statistically significant but different impacts on soil properties, particularly in the topsoil. The forest topsoil measured the lowest ρ s and bulk density (ρ b) but the highest SOM and soil water content at PL, compared to meadow and arable soil. Statistically significant linear relationship was observed with the SOM content and ρ s (− 0.851**), ρ b (− 0.567**), calculated TP (0.567**) and measured TP (− 0.280**). There was a nonlinear relationship between SOM and LL (0.704**) and PL (0.845**) at the topsoil. The findings suggested that SOM content strongly affected ρ s , ρ b , TP, LL and LP. This regional study showed that the conversion of forestland into agricultural land without appropriate measures to conserve SOM leads to the degradation of physical and rheological soil properties.

show abstract

“…Our previous research (e.g. Stanchi et al, 2017) detailed the main phases of water-soil particles interactions for increasing moisture contents in forest soils. The plastic limit is reached when soil shifts from the semi-solid to the plastic state, a condition met when water fills soil pores, excluding air.…”

Section: Introductionmentioning

confidence: 99%

Atterberg limits fail in recognizing fragipan horizons

Stanchi

Negri

D’Amico

et al. 2021

CATENA

Self Cite

View full text Add to dashboard Cite

Fragipan is a subsurface soil horizon characterized by high bulk density, coupled with an abundance of fine, blind pores. We hypothesized that this distinctive porosity pattern could affect the Atterberg limits, with significant deviations from those of otherwise comparable soil horizons. Additionally, longer pre-wetting times might be needed to determine the liquid and plastic limits in fragipan, due to restrictions in water movements. Based on these hypotheses, our research focused on (1) assessing the most suitable fragipan-specific sample preparation time for liquid and plastic limit determination; (2) evaluating if the Atterberg limits reflect the presence of fragic properties; (3) exploring the relationships between Atterberg limits and other relevant soil properties through Artificial Neural Networks. Fragipan horizons (F) had a slightly higher liquid limit, much higher bulk density, and specific surface area than nonfragipan (NF). The plastic limit was however comparable for F and NF. Thus, fragipans had a larger interval of plasticity, which is in contrast with slaking tests and wellknown field evidence. Despite the expected differences between F and NF, three hours' pre-wetting was enough for all samples. This might be due to the size fraction used in the analysis, more sensitive to collapse upon water saturation than bigger clods. Atterberg limits did not help in discriminating F from NF, despite the relevant differences in other soil physical properties. Neural Networks showed that the transition from the plastic to the liquid state was mainly driven by texture and specific surface area, while the plasticity interval was mainly affected by the bulk density. These results provided further insights into the mechanical properties of fragipan horizons.

show abstract

Liquid and plastic limits of clayey, organic C-rich mountain soils: Role of organic matter and mineralogy

Cited by 23 publications

References 44 publications

Repeatability and agreement between methods for determining the Atterberg limits of fine‐grained soils

Repeatability and agreement between methods for determining the Atterberg limits of fine‐grained soils

The conversion of forestland into agricultural land without appropriate measures to conserve SOM leads to the degradation of physical and rheological soil properties

Atterberg limits fail in recognizing fragipan horizons

Contact Info

Product

Resources

About