Effect of laboratory compaction mode, density and suction on the tensile strength of a lime-treated silty soil

Poncelet, Nicolas; Baudin, François

doi:10.1016/j.trgeo.2022.100763

Cited by 15 publications

(9 citation statements)

References 20 publications

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“…Freezing/thawing cycles over the years could not explain the performance degradation [8][9][10][11][12][13], as in situ thermal sensors installed at 0.25 m from the surface did not indicate any temperature below 0 • C [40,48]. processes, such as carbonation or water leaching, could also have led to the degradation observed here; thus, complementary analyses are required to confirm their potential contributions.…”

Section: Discussionmentioning

confidence: 99%

In-Situ Alteration of the Hydro-Mechanical Behaviour of a Compacted Stabilised Expansive Soil

Chabrat,

Cuisinier,

Masrouri

2023

Preprint

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This paper assesses the performance of an embankment constructed in 2010 with a stabilised expansive soil. Two types of treatment were employed at construction time: 4% lime and a mix of 2% lime and 3% cement. A sampling campaign was carried out in 2021 to evaluate the long-term performance of the stabilised soil properties. To assess the compressibility of the soil, oedometer tests were carried out on samples from different parts of the embankment. The results were compared to the compression curve of the untreated soil, also sampled in the same embankment. Complementary shrinkage tests were performed to investigate the effect of the treatment on swelling and shrinkage. The obtained results showed that the behaviour of the material from the outer part was similar to the mechanical performance of the untreated soil, demonstrating strong alteration in the effect of both treatments over time. This alteration was noticeable to a distance of approximately two metres from the external surface. Beyond this distance, the performance of the soil was comparable to the behaviour of recently treated soil. These observations, similar for each treatment dosage, raise questions as to the durability of the treatment on the outer part of the backfill.

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Section: Discussionmentioning

confidence: 99%

In-Situ Alteration of the Hydro-Mechanical Behaviour of a Compacted Stabilised Expansive Soil

Chabrat,

Cuisinier,

Masrouri

2023

Preprint

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“…And the SMSMSP output changes only by 2.7 % when the ambient temperature varies from 20 •C to 60 •C [23]. The regression model shows good estimates of precompression stress for a number of structured soils considering dry bulk density and AD/BD ratio at a matric potential of 6 kPa [24]. Soil is easy to deform as they located on the surface of the crust.…”

Section: Introductionmentioning

confidence: 91%

Experiment Measurement of the Dry Density Variations and Shear Stress with the Different Depth Variations

2023

EESRR

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Evaluation of the dry density variations and shear stress with the different depth variations were shown clearly with the particular process. Results show the Dry unit weight (density) increases gradually with the increase of different depths. The biggest dry density was obtained at 1.582 g/cm3 at 18.3m depth of boreholes (“HK1, 2, and 3”); whereas the lowest value was obtained at 0.74 g/cm3 at 4.3m depth. On the other hand, the dry density changed with the constant loading process. The biggest dry density is 1.954 g/cm3 at 18.3m depth and the lowest value is 1.482 g/cm3 at 8.3m depth (before loading); The biggest value is 2.074 g/cm3 at 18.3m depth and the lowest value is 1.621 g/cm3 at 8.3m depth (after loading). Moreover, shear stress was measured carefully at different depths. At the Clay layer, the lowest value is τ1 with 0.052 kG/cm2 at 4.8m depth; whereas the biggest is τ3 with 1.750 kG/cm2 at 39.6m depth. The biggest value is τ2 with 1.276 kG/cm2 at 17.8m depth. At the Sand layer, the lowest value is τ1 with 0.586 kG/cm2 at 29.8m depth; whereas the biggest is τ3 with 1.750 kG/cm2 at 39.6m depth and τ2 with 1.21 kG/cm2 at 36.0m depth.

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“…However, a large amount of fly ash can play a role similar to that of a lubricant, reducing the internal friction angle. 16)), and carbonization (Equation (17) and Equation ( 18)) to form new substances [33,34].…”

Section: Geofluidsmentioning

confidence: 99%

“…Therefore, improvement technology is the more reasonable method to control carbonate saline soil. Lime is rich in CaO and is often used to improve poor soils [15][16][17]. By mixing lime into the soil, the soil strength can effectively be improved [18,19], along with its volume characteristics [20,21] and shear strength [22].…”

Section: Introductionmentioning

confidence: 99%

Improving Carbonate Saline Soil in a Seasonally Frozen Region Using Lime and Fly Ash

et al. 2022

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In this study, carbonate saline soil in the Duerbote of Songnen Plain was improved by adding lime and fly ash. The improved soil was exposed to 0, 30, and 60 freeze-thaw cycles, and ordinary triaxial compression tests (UU) were conducted under confining pressures of 100, 200, and 300 kPa. The effects of freeze-thaw cycles, lime content, fly ash content, and confining pressure on the peak deviatoric stress, cohesion, and internal friction angle on the lime-ash improved carbonate saline soil were analysed. The incorporation of lime and fly ash in carbonate saline soil transformed the stress-strain curves from the strain hardening type to strain softening type and also changed the strain corresponding to the peak deviatoric stress of the soil. The effect of lime on the shear strength of the soil was the most significant, and it significantly increased the peak deviatoric stress, cohesion, and internal friction angle of the soil. Similarly, the effect of fly ash on the peak deviatoric stress and internal friction angle of the soil was significant, but the effect on cohesion was very limited. A small amount of fly ash increased the peak deviatoric stress and internal friction angle of carbonate saline soil, but an excessive amount had the opposite effects. The freeze-thaw cycles cause the shear strength of the carbonate saline soil to decrease, but the incorporation of lime and fly ash alleviated this decrease.

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Effect of laboratory compaction mode, density and suction on the tensile strength of a lime-treated silty soil

Cited by 15 publications

References 20 publications

In-Situ Alteration of the Hydro-Mechanical Behaviour of a Compacted Stabilised Expansive Soil

In-Situ Alteration of the Hydro-Mechanical Behaviour of a Compacted Stabilised Expansive Soil

Experiment Measurement of the Dry Density Variations and Shear Stress with the Different Depth Variations

Improving Carbonate Saline Soil in a Seasonally Frozen Region Using Lime and Fly Ash

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