Pore Size Distributions of Soils From Mercury Intrusion Porosimeter Data

Sridharan, A.; Rao, G. Venkatappa

doi:10.2136/sssaj1972.03615995003600060046x

Cited by 17 publications

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“…Knowing the dependence of V vs. R , a normalized pore size distribution, χ( R ), was calculated and expressed in the logarithmic scale [ 38 ]: χ( R ) = 1/ V max ·d V /dlog( R ) …”

Section: Methodsmentioning

confidence: 99%

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

et al. 2016

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An admixture of lightweight aggregate substrates (beidellitic clay containing 10 wt % of natural clinoptilolite or Na-P1 zeolite) with used motor oil (1 wt %–8 wt %) caused marked changes in the aggregates’ microstructure, measured by a combination of mercury porosimetry (MIP), microtomography (MT), and scanning electron microscopy. Maximum porosity was produced at low (1%–2%) oil concentrations and it dropped at higher concentrations, opposite to the aggregates’ bulk density. Average pore radii, measured by MIP, decreased with an increasing oil concentration, whereas larger (MT) pore sizes tended to increase. Fractal dimension, derived from MIP data, changed similarly to the MIP pore radius, while that derived from MT remained unaltered. Solid phase density, measured by helium pycnometry, initially dropped slightly and then increased with the amount of oil added, which was most probably connected to changes in the formation of extremely small closed pores that were not available for He atoms.

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“…Knowing the dependence of V vs. R , a normalized pore size distribution, χ( R ), was calculated and expressed in the logarithmic scale [ 38 ]: χ( R ) = 1/ V max ·d V /dlog( R ) …”

Section: Methodsmentioning

confidence: 99%

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

et al. 2016

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“…where σ m is the mercury surface tension, α m is the mercury-solid contact angle (taken as 141.3 • for all studied materials), and A is a shape factor (equal to 2 for the assumed capillary pores). By knowing the dependence of V on R, a normalised pore size distribution, f (R), was calculated and expressed on a logarithmic scale [43] as:…”

Section: Estimation Of Porosity and Pore Size Distributionmentioning

confidence: 99%

Breakage Strength of Wood Sawdust Pellets: Measurements and Modelling

Horabik¹,

Bańda²,

Józefaciuk³

et al. 2021

Materials

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Wood pellets are an important source of renewable energy. Their mechanical strength is a crucial property. In this study, the tensile strength of pellets made from oak, pine, and birch sawdust with moisture contents of 8% and 20% compacted at 60 and 120 MPa was determined in a diametral compression test. The highest tensile strength was noted for oak and the lowest for birch pellets. For all materials, the tensile strength was the highest for a moisture content of 8% and 120 MPa. All pellets exhibited a ductile breakage mode characterised by a smooth and round stress–deformation relationship without any sudden drops. Discrete element method (DEM) simulations were performed to check for the possibility of numerical reproduction of pelletisation of the sawdust and then of the pellet deformation in the diametral compression test. The pellet breakage process was successfully simulated using the DEM implemented with the bonded particle model. The simulations reproduced the results of laboratory testing well and provided deeper insight into particle–particle bonding mechanisms. Cracks were initiated close to the centre of the pellet and, as the deformation progressed, they further developed in the direction of loading.

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“…The average mesopore radius was calculated from pore size distribution functions obtained as the porosimeter reports. Details on porosimetric studies are described in Sridharan and Venkatappa Rao [ 44 ]. Mesopores play a crucial role in the formation of soil structure.…”

Section: Methodsmentioning

confidence: 99%

Effect of Low Zeolite Doses on Plants and Soil Physicochemical Properties

et al. 2021

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Thousands of tons of zeolitic materials are used yearly as soil conditioners and components of slow-release fertilizers. A positive influence of application of zeolites on plant growth has been frequently observed. Because zeolites have extremely large cation exchange capacity, surface area, porosity and water holding capacity, a paradigm has aroused that increasing plant growth is caused by a long-lasting improvement of soil physicochemical properties by zeolites. In the first year of our field experiment performed on a poor soil with zeolite rates from 1 to 8 t/ha and N fertilization, an increase in spring wheat yield was observed. Any effect on soil cation exchange capacity (CEC), surface area (S), pH-dependent surface charge (Qv), mesoporosity, water holding capacity and plant available water (PAW) was noted. This positive effect of zeolite on plants could be due to extra nutrients supplied by the mineral (primarily potassium—1 ton of the studied zeolite contained around 15 kg of exchangeable potassium). In the second year of the experiment (NPK treatment on previously zeolitized soil), the zeolite presence did not impact plant yield. No long-term effect of the zeolite on plants was observed in the third year after soil zeolitization, when, as in the first year, only N fertilization was applied. That there were no significant changes in the above-mentioned physicochemical properties of the field soil after the addition of zeolite was most likely due to high dilution of the mineral in the soil (8 t/ha zeolite is only ~0.35% of the soil mass in the root zone). To determine how much zeolite is needed to improve soil physicochemical properties, much higher zeolite rates than those applied in the field were studied in the laboratory. The latter studies showed that CEC and S increased proportionally to the zeolite percentage in the soil. The Qv of the zeolite was lower than that of the soil, so a decrease in soil variable charge was observed due to zeolite addition. Surprisingly, a slight increase in PAW, even at the largest zeolite dose (from 9.5% for the control soil to 13% for a mixture of 40 g zeolite and 100 g soil), was observed. It resulted from small alterations of the soil macrostructure: although the input of small zeolite pores was seen in pore size distributions, the larger pores responsible for the storage of PAW were almost not affected by the zeolite addition.

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Pore Size Distributions of Soils From Mercury Intrusion Porosimeter Data

Cited by 17 publications

References 0 publications

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

Modification of Lightweight Aggregates’ Microstructure by Used Motor Oil Addition

Breakage Strength of Wood Sawdust Pellets: Measurements and Modelling

Effect of Low Zeolite Doses on Plants and Soil Physicochemical Properties

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