Collapsibility of metastable sand by non-conventional oedometer tests

Zimbardo, Margherita; Ercoli, Laura; Megna, Bartolomeo; Scaffaro, R.

doi:10.1007/s10035-018-0854-6

Cited by 18 publications

(3 citation statements)

References 21 publications

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“…Polymers from cellulose have been extensively used and studied for application on cultural heritage, finding that both cellulose ethers (Feller and Wilt, 1990) and nitrate (Selwitz, 1988) have some stability issues. Finally, PEG was recently proposed in order to consolidate collapsible soil, highlighting interesting properties (Zimbardo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Durability of Biodegradable Polymers for the Conservation of Cultural Heritage

et al. 2019

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The use of polymers for conservation of cultural heritage is related to the possibility to slow down or stop natural deterioration which, in many cases, corresponds to stopping the entrance of liquid water and to favor spontaneous water vapor removal. Unfortunately, hydrophobicity is generally favored by surface roughness and thus competitive with transparency. It is therefore important to find an optimal balance hydrophobicity, transparency and durability (especially to photooxidation). However, polymers typically used for applications in this field come from non-renewable resources and are not biodegradable. In this work, the mechanical, structural, and optical properties of PLA, PBAT, and a PBAT/PLA blends, as well as surface properties and water vapor permeability, were investigated before and after exposure to UV irradiation, in order to evaluate their durability and suitability for conservation of cultural heritage.

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Section: Introductionmentioning

confidence: 99%

Durability of Biodegradable Polymers for the Conservation of Cultural Heritage

et al. 2019

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“…In terms of the bonding mechanism, the water menisci play a significant role in the collapse of granular soils. Research showed that applying polar liquids different from water can reduce the collapse potential by 90% 14 . With a similar concept, pollutants in the water, e.g., from the leakage of sewage systems, also has a great impact on the surface collapse due to chemical attack to the bonds between the soil particles 15 .…”

Section: Introductionmentioning

confidence: 99%

The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting

Mahinroosta

Oshtaghi

2021

Sci Rep

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This paper investigates the effect of particle shape on the stress reduction and collapse deformation of gravelly soil using a medium-scale direct shear test apparatus under different relative densities, normal stress, and shear stress levels. A new method based on the Micro-Deval test was introduced to produce sub-angular particles from angular particles. Therefore, two series of soil specimens were obtained with the same rock origin, particle size distribution, and relative density but different particle shapes. In addition to traditional direct shear tests on dry and wet specimens, a specific test procedure was applied to explore the stress reduction and collapse of soil specimens due to wetting. The results of the tests, including shear stress–shear displacement and vertical displacement-shear displacement, were compared. The results showed that the stress reduction and settlement due to wetting increased with vertical and shear stress levels in both types of particle shapes, with higher values in angular particle shapes. The particle breakage of the soil specimens was also studied quantitatively using the change in the particle size distribution before and after the test. It was shown that the wetting of the samples had more impact on the particle breakage in angular gravel than sub-angular gravel, which increased linearly with the normal stress.

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“…In terms of bonding mechanism, the water menisci play a significant role in the collapse of granular soils. Research showed that applying polar liquids different from water can reduce collapse potential by 90% 14 . With a similar concept, pollutants in the water, e.g.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Shape on the Deformation and Stress Reduction of a Gravel Soil Due to Wetting

Mahinroosta

Oshtaghi

2021

Preprint

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In this paper, the effect of particle shape is investigated on the stress reduction and collapse deformation of gravelly soil using medium-scale direct shear test apparatus under different relative densities, normal stress, and shear stress levels. The Micro-Deval test was used to produce sub-angular particles from angular particles with continuous smoothening of the corners of the particles. Two series of soil specimens were obtained with the same rock type, particle size distribution, and relative density but different particle shapes. In addition to traditional direct shear tests on dry and wet specimens, a specific test procedure was applied to explore the stress reduction and collapse of soil specimens due to wetting. For instance, dry soil specimens under several normal pressure were subjected to shear loading while inundated at several levels of shear stresses. The results showed that the stress reduction and settlement due to wetting increased with vertical and shear stress level in both types of particle shapes, with higher values in angular particle shapes. The wetting of the samples had more impact on the particle breakage in angular gravel than sub-angular gravel, which increased linearly with the normal stress.

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Collapsibility of metastable sand by non-conventional oedometer tests

Cited by 18 publications

References 21 publications

Durability of Biodegradable Polymers for the Conservation of Cultural Heritage

Durability of Biodegradable Polymers for the Conservation of Cultural Heritage

The effect of particle shape on the deformation and stress reduction of a gravel soil due to wetting

Effect of Particle Shape on the Deformation and Stress Reduction of a Gravel Soil Due to Wetting

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