Influence of the microstructure on the hydro-mechanical behaviour of a natural silty clay

Mascarenha, Marcia Ma dos Anjos; Neto, Manoel Porfírio Cordão; Morales, Enrique Edgar Romero

doi:10.1201/b10526-16

Cited by 4 publications

(6 citation statements)

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“…Thus, as showed, the microstructure is the part of the soil not affected by loading paths, these values are constant for all samples studied, even with different void ratios and moulding processes since compaction only alters the macrostructural level of soil structure. Findings showing microstructure pore distribution remaining unchanged with loading paths have been reported by Simms & Yanful (2002), Romero et al (2005), Buenfil (2007), and Mascarenha (2008).…”

Section: Modelling the Water Retention Curvesupporting

confidence: 59%

Alternative Method for Analysing Hydromechanical Behaviour of Unsaturated Soils

Mascarenha¹,

Neto²,

Silva³

2016

S&R

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The suction-control techniques commonly used for laboratory studies of mechanical behaviour of unsaturated soils are much more time consuming than standard soil mechanics tests. In addition, few laboratories have the required apparatus for testing unsaturated soils. This paper proposes an alternative method of analysing hydromechanical behaviour of unsaturated soils with high-porosity. The method is divided in three tasks: 1) verification of the effect of void ratio changes on the water retention curve using filter paper; 2) determining water content changes by evaporation under the same test conditions; and 3) performing saturated and unsaturated consolidation tests. Unsaturated tests make use of samples that are less than 100% saturated and there is no suction control during the test. Therefore, only initial water content is known. Significant suction changes take place due to void closure and evaporation while testing. The results obtained using the proposed methodology showed the stress and suction path and enhance the understanding of the hydromechanical behaviour of unsaturated soils. The results also showed that analyses of water content alone cannot explain some unexpected results, such as: 20% initial water content samples present less deformation than 16% samples.

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Section: Modelling the Water Retention Curvesupporting

confidence: 59%

Alternative Method for Analysing Hydromechanical Behaviour of Unsaturated Soils

Mascarenha¹,

Neto²,

Silva³

2016

S&R

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“…The pressure is inversely proportional to the size of the pores, and only slight pressure is required for mercury to intrude into large macropores, whereas much greater pressure is required to force mercury into small pores. In porous medium, mercury intrusion is similar to air injection in a saturated soil in the drying process of a water retention curve (Prapaharan et al, 1987;Romero et al, 1999;Aung et al, 2001;Simms and Yanful, 2001;Zhang and Li, 2010;Mascarenha et al, 2011;Otalvaro et al, 2016). A PoreMaster 60 GT (Quantachrome Instruments) mercury porosimeter was used, and a surface tension and contact angle of mercury of 480 mN m -1 and 130°, respectively, were chosen.…”

Section: Methodsmentioning

confidence: 99%

Impact of marble powder amendment on hydraulic properties of a sandy soil

et al. 2020

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Marble powder is one of carbonate rock amendments that is used to improve soil reaction. We hypothesized that the powdered marble addition can cause favorable changes in hydraulic properties of sandy soils. Six levels of marble powder addition to an aridisol soil (0%; M0; 5%; M5; 10%; M10; 15%; M15; 20%; M20 and 25%, M25; by bulk volume) were analyzed in triplicate. The saturated hydraulic conductivity and soil water retention curves were obtained. Pore space properties were investigated using soil water retention curves, mercury intrusion porosimetry and scanning electron microscopy. The saturated hydraulic conductivity significantly decreased (between 83 and 97% for M5 and M25 respectively) and parameters α and n of the van Genuchten model significantly decreased in marble-amended soils. Both field capacity and permanent wilting point increased with the addition of marble powder. Plant-available water, increased significantly until 10% of marble powder application; higher percentages of application did not provide additional significant changes in the plant-available water. Pore space distributions from soil water retention curves parameters showed an increase in the pore size range and a decrease in the average pore size; pore space distribution from the scanning electron microscopy also showed the presence of a new family of dominant pore sizes which was not detected by the soil water retention curves parameters approach. It was concluded that the addition of marble powder can improve the ability of soil to store water providing an advantage for irrigation water management in water scarce environments. Further research will have to address the impact of marble powder amendment under field semi-arid conditions. K e y w o r d s: saturated hydraulic conductivity, soil water retention curve, field capacity, plant available water, pore size distribution

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“…O processo de intrusão de mercúrio é análogo à curva de retenção de água durante a trajetória de secagem, quando se aplica uma pressão de ar externa gradativamente em um material poroso totalmente saturado (Mascarenha et al, 2011).…”

Section: Distribuição E Tamanho De Porosunclassified

“…É aceito na literatura técnica que a intrusão de mercúrio, em um meio poroso, é um processo similar à injeção de ar durante a secagem na curva de retenção de água do solo (Romero et al, 1999;Mascarenha et al, 2011;Otálvaro, 2013…”

Section: Distribuição E Tamanho De Porosunclassified

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Comportamento mecânico de um agregado reciclado a partir de resíduos de construção e demolição submetido a carregamentos cíclicos

Jiménez¹,

Alejandra²

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Influence of the microstructure on the hydro-mechanical behaviour of a natural silty clay

Cited by 4 publications

References 0 publications

Alternative Method for Analysing Hydromechanical Behaviour of Unsaturated Soils

Alternative Method for Analysing Hydromechanical Behaviour of Unsaturated Soils

Impact of marble powder amendment on hydraulic properties of a sandy soil

Comportamento mecânico de um agregado reciclado a partir de resíduos de construção e demolição submetido a carregamentos cíclicos

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