Pore Size Distributions in Clays

Diamond, Sidney

doi:10.1346/ccmn.1970.0180103

Cited by 313 publications

(173 citation statements)

References 10 publications

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“…For soils that display an interconnected porosity, the mercury intrusion porosimetry (MIP) technique is commonly employed to infer the pore size distribution (PSD) which provides information about the fabric of the soil mass (e.g., [13]). Therefore, changes in the soil fabric caused by tube sampling would be reflected in the PSD curve.…”

Section: Microstructural Analysismentioning

confidence: 99%

“…where r Hg is the surface tension of mercury (0.484 N/m at 25°C, as adopted by Diamond [12], Delage and Lefebvre [13]) and r nw is the mercury-soil contact angle (assumed equal to 140°as adopted by Romero [61]). Values of the void ratio associated with intruded mercury are computed from the test results obtained during the intrusion stage as e MIP = V mercury /V solids , where V solids is the volume of the dry solids used for the MIP test and V mercury is the cumulative volume of intruded mercury at the current pressure.…”

Section: Microstructural Analysismentioning

confidence: 99%

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Getting high-quality samples in ‘sensitive’ soils for advanced laboratory tests

Fonseca

Pineda

2017

Innov. Infrastruct. Solut.

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Laboratory tests are well recognized as highly appropriate for defining the engineering properties of geomaterials, in terms of constitutive law parameters for modeling geotechnical engineering problems. The strong development of advanced techniques, both in equipment and in data interpretation, has increased the confidence in laboratory testing, while on the other hand the limitations due to the quality of soil sampling with depth and the spatial representativeness of the samples are less consensual. Still, the development of new methods for assuring high-quality samples is increasing, together with sampling quality assessment by non-destructive methods using vibration wave velocities. Interpretation methods of in situ tests for ground characterization have also evolved significantly, increasing the reliability of these methods. Their versatility to cover large areas on site and the fact that these tests are, in principle, performed at the actual state (physical and stress) conditions, as well as the improvements in the correlations between field tests and hydraulic and geomechanical parameters, allow joining the quality of data and theoretical approaches, namely through critical state soil mechanics. This keynote paper discusses some of the aspects that can and should enable the association of ground characterization from laboratory testing over undisturbed samples used in more or less advanced tests, enhancing the determinant conditioning factor, that is, the sampling technique to get representative specimens and the way this is assessed. The confidence that we expect to have on the geomechanical parameters that we need for our geotechnical activities will mostly depend on this in view of the high uncertainties of the parametrical correlations with in situ test data, therefore, important in ground characterization. This is especially relevant in sensitive soils, such as soft fine soils, loose sandy soils, or young residuals soils. These have or can have ''weak'' equilibria of the interparticle micro-and macrostructures (or their arrangement, fabric) that will change substantially their properties if samples are collected and conditioned with processes that do not preserve that intrinsic ''ADN''. The change in these natural conditions can be evaluated by techniques of quality assessment, which will be discussed in what follows.

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Section: Microstructural Analysismentioning

confidence: 99%

Section: Microstructural Analysismentioning

confidence: 99%

Getting high-quality samples in ‘sensitive’ soils for advanced laboratory tests

Fonseca

Pineda

2017

Innov. Infrastruct. Solut.

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“…Mercury intrusion porosimetry technic (MIP) has been employed by many researchers in order to investigate soil structural features as [27][28][29][30][31] and others. Distribution, size and connectivity of pores may be used to define mechanical and hydraulic properties of soils [32,33].…”

Section: Pore-size Distributionmentioning

confidence: 99%

Influence of structure in the soil-water characteristic curves of two residual soils of granite

et al. 2016

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Abstract. This paper discusses the influence of structure in the soil-water characteristic curves (SWCC) of two residual soils of granite formed in a subtropical environment. One soil has a saprolitic nature (named GrSp) and the other shows lateritic behavior (named GrLt). Both materials occur on a slope which presents a extensive history of landslides in the municipality of São José, Southern Brazil. SWCC of undisturbed and remolded specimens were determined using the filter-paper technique. Undisturbed specimens were collected and remolded specimens were produced by static compression of disintegrated soil to the same void ratio and moisture content of undisturbed specimens. SWCC of saprolitic soil showed curves which were modelled as unimodal but the lateritic soil required the use of bimodal curves because of the structure developed in micro and macro levels. Suction levels measured in GrLt soil were higher than in saprolitic soil. Remolding process changed the levels of suction achieved, which is due to the structure and more specifically to the size of pores in the remolded soils. Hysteresis were verified in both materials, but were far more pronounced in the lateritic soil. Analysis of mercury intrusion porosimetry were carried out in GrSp soil. They showed that remolding generates a different pore distribution from the existing in the undisturbed soil.

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“…where σ is the mercury-solid interfacial tension and θ is the mercury-solid contact angle (σ =0.484 N/m and θ =141.3° according to Diamond,6). …”

Section: Microstructure Investigationmentioning

confidence: 99%

A microstructure insight into the water retention properties of the Callovo-Oxfordian claystone

et al. 2016

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Abstract. The effect of changes in suction on the microstructure of the Callovo-Oxfordian claystone along wetting and drying paths was investigated by using mercury intrusion porosimetry. Based on a simplified brick model, the changes of the average thickness of the platelets that constitute the clay matrix (50%) are interpreted as the consequence of the successive adsorption of ordered layers of water molecules along the smectite surfaces, as demonstrated on pure smectites for a long time. This shows the predominant role played by the smectite phase in the overall response of the Callovo-Oxfordian claystone when submitted to suction changes under no stress.

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Pore Size Distributions in Clays

Cited by 313 publications

References 10 publications

Getting high-quality samples in ‘sensitive’ soils for advanced laboratory tests

Getting high-quality samples in ‘sensitive’ soils for advanced laboratory tests

Influence of structure in the soil-water characteristic curves of two residual soils of granite

A microstructure insight into the water retention properties of the Callovo-Oxfordian claystone

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