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Artykuły w czasopismach na temat „Sand”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Rhee, Seung Whee, and Woo Keun Lee. "Characteristics of Spent Foundry Sand - Loess Mixture as Ceramic Support Materials." Materials Science Forum 510-511 (March 2006): 378–81. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.378.

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Spent foundry sand (SFS) from cast iron industry mixed with loess was characterized to recycle spent foundry sand as ceramic support materials. Since SFS mostly consists of sand including binding agents and residue [1], it was used as permeable media, and loess, which has highly adsorptive and reactive properties, was used as support materials Leaching tests such as Korean Leaching Test (KLT) and TCLP (Toxicity Characteristics Leaching Procedure) showed that spent foundry sands from cast iron industry were not hazardous. Turbidity in furan sand was much higher than that in other sands, and tur

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Holtzer, M., D. Drożyński, A. Bobrowski, and J. Makselon. "Method of the Moulding Sands Binding Power Assessment in Two-Layer Moulds Systems / Metoda oceny wielkości siły wiązania mas w układzie form dwuwarstwowych." Archives of Foundry Engineering 13, no. 2 (2013): 39–42. http://dx.doi.org/10.2478/afe-2013-0033.

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Abstract More and more foundry plants applying moulding sands with water-glass or its substitutes for obtaining the high-quality casting surface at the smallest costs, consider the possibility of implementing two-layer moulds, in which e.g. the facing sand is a sand with an organic binder (no-bake type) and the backing sand is a sand with inorganic binder. Both kinds of sands must have the same chemical reaction. The most often applied system is the moulding sand on the water-glass or geopolymer bases - as the backing sand and the moulding sand from the group of self-hardening sands with a res

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Hachem, Rafika, Nassima Meftah, and Ahmed Bouaziz. "A comparative analysis of the microstructural and physicochemical properties of alluvial and dune sands from northeast Algerian Sahara." Journal of Engineering and Exact Sciences 9, no. 6 (2023): 16222–01. http://dx.doi.org/10.18540/jcecvl9iss6pp16222-01e.

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This paper investigates the physical, chemical, and microstructural properties of two types of natural sand; alluvial sands and dune sand from the El-Oued region in the northeastern Algerian Sahara. Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray Fluorescence (XRF), Scanning electron microscopy (SEM/EDS), and granulometry analysis have been performed. The FTIR and XRD analysis prove that the alluvial sand and dune sand consist of high percentages of ?-quartz (SiO2), low amounts of calcite (CaCO3), and gypsum minerals (CaSO4;2H2O). The chemical analysis confirmed

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4

Rengifo Barbosa, Fernando, Rahman Miri, Mahmood Salimi, and Alireza Nouri. "Thermal Effects on Fines Migration: Insights from Sand Pack Experiments." Energies 18, no. 13 (2025): 3471. https://doi.org/10.3390/en18133471.

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Mobilisation of in situ fine particles within oil sands reservoirs plays a critical role in permeability reduction and pore throat blockage, ultimately impairing reservoir performance and diminishing well productivity during thermal recovery operations. Variations in reservoir fluid conditions, such as changes in salinity and temperature, trigger the detachment, transport, and redeposition of fines within porous media. This study introduces a novel high-pressure high-temperature (HP-HT) sand retention testing (SRT) facility designed for evaluating formation damage by fines migration in SAGD pr

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5

Alutu, O. E., and B. K. Ifejika. "Strength Study of Concrete Made with Various Local Sands in Benin City, Nigeria." Advanced Materials Research 18-19 (June 2007): 21–26. http://dx.doi.org/10.4028/www.scientific.net/amr.18-19.21.

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The paper focuses on the effect which varying the type of sand used in concrete will have on the compressive strength of concrete and seeks to determine the suitability of each sand for use in concrete works. The sand samples used include Okhoro, Ikpoba, Ovia and Okhuahiaerosion sands and Ikpoba, Ovia and Okhuahia river sands. Particle size distribution of the sands was first determined and the result was used to design grades 20, 25, and 30 concretes to Department of Environment (DOE) mix design method. Twelve cubes were cast from one particular sand sample and three cubes were tested at 7, 1

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6

Eager, David, Chris Chapman, Yujie Qi, Karlos Ishac, and Md Imam Hossain. "Additional Criteria for Playground Impact Attenuating Sand." Applied Sciences 11, no. 19 (2021): 8805. http://dx.doi.org/10.3390/app11198805.

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Falls within children’s playgrounds result in long bone and serious injuries. To lower the likelihood and severity of injury, impact attenuating surfaces (IAS) are installed within the impact area (fall zone). There are three primary IAS materials used, namely: granulated rubber products, wood fibre products, and sand. There is a deficiency with existing IAS test methods in that they do not take account of sand degradation over time. When children use the playground, sand degradation can occur when sand produces fines and smaller particles with low sphericity and angular which fill the voids b

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7

Joshi, R. C., Gopal Achari, Shenbaga R. Kaniraj, and H. Wijeweera. "Effect of aging on the penetration resistance of sands." Canadian Geotechnical Journal 32, no. 5 (1995): 767–82. http://dx.doi.org/10.1139/t95-075.

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The main objective of this study was to understand the effect of aging on the penetration resistance of freshly deposited sands. Two types of sand, locally available river sand used as masonry sand and Beaufort Sea sand, were selected for the study. The sands were allowed to age under a constant stress of 100 kPa in a specially designed apparatus in a dry state, as well as submerged in distilled water and in simulated sea water. Penetration resistance of the sand beds was measured periodically by pushing 4 probes into the sand bed. Mineralogical and fabric studies on freshly deposited and aged

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8

Jacobs, Trent. "How Wet-Sand Completions Became Key to Chesapeake’s Low-Cost Future." Journal of Petroleum Technology 73, no. 04 (2021): 29–31. http://dx.doi.org/10.2118/0421-0029-jpt.

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Matt Mantell wasn’t always sure that completing horizontal wells with wet sand was going to be as efficient as using smooth-flowing dry sand. But after proving how well it does work, and how much money it saves, the completions engineering advisor with Chesapeake Energy said the plan to use wet sand at every possible opportunity is moving “full-speed ahead.” Wet sand represents a new trend in the US shale sector that has spread from operator to operator. After the sand is washed free of unwanted particulates at the mine, it has historically been dried before being delivered to a wellsite. Wet

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9

Park, Seo Kyoung, Jang K. Kim, and Han Gil Choi. "Effect of substratum types on the growth of assimilators and stolons of Caulerpa okamurae (Bryopsidales, Chlorophyta)." Algae 37, no. 4 (2022): 293–99. http://dx.doi.org/10.4490/algae.2022.37.12.10.

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To examine the effects of substratum types on the growth of Caulerpa okamurae, sand surface and sand burial experiments were conducted. Five assimilators (erect fronds) per replicate were cultured for 15 d on the surface of three different treatments: fine sand (200 μm), coarse sand (600 μm), and no sand (control). Also, three stolons and three assimilators were buried by fine grain or coarse grain sands and incubated for 15 d. In both experiments, other culture conditions included 25°C, 30 μmol photons m-2 s-1, and 16 : 8 h L : D (light : dark). In both experiments, stolon + assimilator-, ass

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10

Pallares, Jesus David Montero, Chenxi Wang, Mohammad Haftani, and Alireza Nouri. "Aperture Design Optimization of Wire-Wrapped Screens for SAGD Production Wells." Eng 4, no. 2 (2023): 1058–70. http://dx.doi.org/10.3390/eng4020062.

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Wire-wrapped screens have been established as one of the primary sand control devices in Steam-Assisted Gravity Drainage (SAGD) wells due to the high open-to-flow area and superior plugging attributes. However, their design is still a point of interest for thermal operations. Generally, existing approaches rely on one or more particular points of reservoir sands’ particle size distribution (PSD) and rules of thumb inferred from other devices like the slotted liners. This study used Sand Retention Testing (SRT) to analyze the performance of WWS under various testing conditions, which were negle

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11

Yannick, Tchedele Langollo, Bilkissou Alim, Njoya Mfokou Abdou Nasser, et al. "Comparative Study of Mortars Made with Sands of Different Geological Origin." Advances in Materials Science and Engineering 2023 (November 28, 2023): 1–15. http://dx.doi.org/10.1155/2023/5139325.

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The present work is a comparative study of sand mortars from various geological origins to highlight their influence on mortar qualities. Five different sands and the cement CEM II/B–P 42.5R were used to produce mortars with similar water/cement ratios (W/C). These are the “Sanaga” sand from the Sanaga River, the “Wouri” sand from the Wouri River, the Nyambaka basalt sand, the Meiganga granite sand, and the Leboudi gneiss sand. The physical, chemical, and mineralogical features of these sands were used to characterize and classify them. They were then used to formulate mortars, which were anal

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12

Skrzyński, M., R. Dańko, and J. Kamińska. "Reclamation of Mixtures of Spent Sands of Inorganic and Organic Type." Archives of Foundry Engineering 13, no. 4 (2013): 93–96. http://dx.doi.org/10.2478/afe-2013-0089.

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Abstract The results of investigations of the reclamation of spent moulding and core sands, originated from one of the Polish foundry plants, are presented in the paper. Four mixtures consisting of two types of spent sands (spent moulding sand and spent core sand) were subjected to the regeneration process. Each tested mixture consisted of an inorganic type spent moulding sand and of an organic type spent core sand. Proportions of mutual fractions of spent moulding and core sands in mixtures was 70%-30% and was representative for the waste sands from the foundry, from which these sands origina

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13

Gurav, Ranjit, Chang Ji, and Sangchul Hwang. "Investigating the Potential of River Sediment Bacteria for Trichloroethylene Bioremediation." Water 16, no. 20 (2024): 2941. http://dx.doi.org/10.3390/w16202941.

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Trichloroethylene (TCE) is a prevalent groundwater contaminant detected worldwide, and microbes are sensitive indicators and initial responders to these chemical contaminants causing disturbances to their ecosystem. In this study, microbes isolated from San Marcos River sediment were screened for their TCE degradation potential. Among the twelve isolates (SAN1-12), five isolates demonstrated TCE degradation within 5 days at 25 °C and 40 mg/L of TCE concentration in the following order: SAN8 (87.56%), SAN1 (77.31%), SAN2 (76.58%), SAN3 (49.20%), and SAN7 (3.36%). On increasing the TCE concentra

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14

Branavan, A., K.M.C. Konthesingha, S.M.A. Nanayakkara, and H.M.R. Premasiri. "Optimizing Blending of Manufactured Sand with Offshore Sand Based on Physical and Virtue Characteristics." Optimizing Blending of Manufactured Sand with Offshore Sand Based on Physical and Virtue Characteristics 6, no. 3 (2020): 11–31. https://doi.org/10.5281/zenodo.4133384.

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<strong>Abstract: </strong>Usage of alternative fine aggregates in concrete and cement mortar has been gradually increasing by the construction industries around the world due to the escalated shortage in obtaining natural river sand. Manufactured sand and offshore sand can be considered as the principal alternatives which are consumed by most of the contractors for substituting river sand in the construction activities now. However, most of the above sand consumptions are done without deeply analyzing the conformity of the alternatives to concrete and cement mortar. The present study is execu

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15

Li, Zhenhua, Zihao Zhu, Yahong Zhao, Cong Zeng, and Peng Zhang. "Experimental Investigation on the Diffusion Law of Polymer Slurry Grouted in Sand." Polymers 14, no. 17 (2022): 3635. http://dx.doi.org/10.3390/polym14173635.

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Polymer slurry is widely used in underground engineering treatment, but due to the concealed nature of underground projects, the diffusion pattern of slurry in the sand has been little studied. In this study, the basic physical properties of water-based polyurethane, oil-based polyurethane, and acrylate and epoxy resin were compared, and the performance of chemical grouted sands with different polymer slurry/sand mass ratios (PS/S) was tested. The higher the PS/S, the better the mechanical and impermeability properties of the chemical grouted sands. In this paper, water-based polyurethane was

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16

MILTON, Roy Zwalatha, Mohammed Bello ADAMU, Kabir GARBA, Saidu Mohammed SALEH, and Yahaya Yakubu ADAMU. "Appraisal of the Propping Potential of Luwa Sand in Nigeria for Hydraulic Fracturing Applications." ABUAD Journal of Engineering and Applied Sciences 2, no. 1 (2024): 10–19. http://dx.doi.org/10.53982/https://doi.org/10.53982/ajeas.2024.0201.02-j.

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Natural sands made of spherical and round grains are widely used as proppants during hydraulic fracturing to increase recovery rate of hydrocarbon production. Synthetic proppants with high crush strength are employed for deep reservoir fracturing; however, this type of proppants suffer the disadvantages of high density, high cost and pose environmental hazards. This research was conducted with the aim to assess sands collected from Luwa River in Toro, Bauchi state of Nigeria for possible use as natural sand proppants. An epoxy resin-coated sand was produced using a simple method to modify the

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MILTON, Roy Zwalatha, Mohammed Bello ADAMU, Kabir GARBA, Saidu Mohammed SALEH, and Yahaya Yakubu ADAMU. "Appraisal of the Propping Potential of Luwa Sand in Nigeria for Hydraulic Fracturing Applications." ABUAD Journal of Engineering and Applied Sciences 2, no. 1 (2024): 10–19. http://dx.doi.org/10.53982/ajeas.2024.0201.02-j.

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Natural sands made of spherical and round grains are widely used as proppants during hydraulic fracturing to increase recovery rate of hydrocarbon production. Synthetic proppants with high crush strength are employed for deep reservoir fracturing; however, this type of proppants suffer the disadvantages of high density, high cost and pose environmental hazards. This research was conducted with the aim to assess sands collected from Luwa River in Toro, Bauchi state of Nigeria for possible use as natural sand proppants. An epoxy resin-coated sand was produced using a simple method to modify the

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18

Pratiwi, Wieke, Gaos Abdul Karim, and Titi Rachmawati. "Local Silica Sand as a Substitute for Standard Ottawa Sand in Testing of Cement Mortar." Materials Science Forum 1000 (July 2020): 220–26. http://dx.doi.org/10.4028/www.scientific.net/msf.1000.220.

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Compressive strength of cement mortar is an important parameter in the quality control of Portland cement. The limitation of Ottawa sand imports has prompted a study on the potential and utilization of local silica sand available in several regions in Indonesia. The purpose of this study was to investigate the potential and possibility of utilizing local silica sand from several regions in Indonesia including Bangka, Belitung, Sidrap (South Sulawesi Province) as a substitute for standard Ottawa sand in cement mortar testing. Evaluation of local silica sands consisted of SEM analysis, character

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19

Zhang, Rui, Hai Bao Liu, Si Hua Zhang, Gui Yin Zeng, and Jian Qiao Li. "Finite Element Analysis in the Characteristics of Ostrich Foot Toenail Traveling on Sand." Applied Mechanics and Materials 461 (November 2013): 213–19. http://dx.doi.org/10.4028/www.scientific.net/amm.461.213.

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The ostrich foot toenail plays a crucial role in the process of ostrich foot traveling on sand. 3D laser scanner was used to measure the three-dimensional point clouds of ostrich foot toenail surface morphology, and the three-dimensional model of ostrich foot toenail was reconstructed by using reverse engineering technology. The finite element analysis in the interactions between ostrich foot toenail and sand was implemented by Abaqus and Hypermesh. The quasi-static analytical results of ostrich foot toenail inserting the sands showed that the groove structure of the toenail had a better sand

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Ding, Chun Sheng, Xiao Yan Ma, Ying Long Zhou, and Ping Ning. "Experimental Study on Preparation and Pb²⁺ Adsorption Capability of Ferric Salt Modified Sands." Applied Mechanics and Materials 130-134 (October 2011): 852–55. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.852.

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Ferric salt modified sands were prepared with quartz sand as a carrier and ferric salt coating by the two methods of repeat high-temperature process and repeat alkaline deposition process. The specific surface area of two ferric salt modified sands were detected, and their Pb2+ adsorption capability in different conditions were also described in this paper. The results showed that the specific surface area of ferric chloride and ferric nitrate modified sand was 2.468m2/g and 4.247m2/g respectively, which was 6.910 and 12.612 times more than that of raw quartz sand. In the neutral pH condition,

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21

Benjelloun, Mohamed, Rachid Bouferra, Hassan Ibouh, Frederic Jamin, Ismail Benessalah, and Ahmed Arab. "Mechanical Behavior of Sand Mixed with Rubber Aggregates." Applied Sciences 11, no. 23 (2021): 11395. http://dx.doi.org/10.3390/app112311395.

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The main objective of this study is to compare the mechanical behavior of two sands (Hostun or Dune sands) mixed with crushed rubber obtained from used tires. However, it is essential to ensure that his geotechnical application do not result in long-term negative impacts on the environment. The chemical properties of these two sands are given by energy dispersive analysis X-ray fluorescence spectrometry. The mineral composition of these two sands is performed by X-ray diffractometry. The morphological characteristics of the sand grains are given by the analysis of the images of the two sands g

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22

Khouadjia, M. L. K., K. Abdou, A. A. Belkadi, O. Kessal, and B. Mezghiche. "Effect of Sands on the Evolution of the Modulus of Deformability and Longitudinal and Transverse Elasto-Instantaneous Deformations as a Function of the Relative Constraint in Concrete." Journal of Applied Engineering Sciences 12, no. 2 (2022): 185–92. http://dx.doi.org/10.2478/jaes-2022-0025.

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Abstract The production of crushed sand is accompanied by the production of fine particles. The proportion of these fine particles varies from one sand to another. The current publications of standards for reference in the construction industry have been adapted by increasing the limit of fine particles in crushed sand, but this is insufficient because sands with high rate of fine particles are not used in the industry. The principal objective of this study is to investigate the influence of crushed sands with different mineralogical natures (limestone and siliceous) and with varying proportio

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23

Sun, Jimin. "Origin of Eolian Sand Mobilization during the Past 2300 Years in the Mu Us Desert, China." Quaternary Research 53, no. 1 (2000): 78–88. http://dx.doi.org/10.1006/qres.1999.2105.

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AbstractEolian sand dunes and sand sheets are extensive in the semiarid regions of northern-central China. Previous studies indicated that these eolian sands mainly formed during historical times. However, the sand sources and their reworking processes have not been well studied, and even the reasons for their occurrence are still controversial. Field investigation and sedimentary evidence indicate that both the inner Mu Us Desert and its southern marginal region, both sources of modern eolian sand, are largely associated with reworking of sands of the last glaciation. Based on geological, doc

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Alutu, O. E., and A. Omorogie. "The Influence of Vibration Time and Sand Type on the Compressive Strength of Sandcrete Hollow Blocks." Advanced Materials Research 62-64 (February 2009): 24–30. http://dx.doi.org/10.4028/www.scientific.net/amr.62-64.24.

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The purpose of this study is to see if varying the vibration time and sand type during moulding of blocks would affect the strength of the blocks. To this end, seven types of sands: Okhuahie and Ovia river sands; Okhuahie, Ovia, Ikpoba flood and Okhoro erosion sands were collected for the study. A total of 315 blocks each in 150mm and 225mm sizes with cement to sand ratios of 1:6 were made using the seven brands of sand. The blocks were vibrated for 10, 15, 20, 25, and 30 seconds and tested for compressive strength at 7 days, 14 days and 28 days respectively. The result showed that the relatio

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25

Huang, An-Bin, Huai-Houh Hsu, and Jia-Wei Chang. "The behavior of a compressible silty fine sand." Canadian Geotechnical Journal 36, no. 1 (1999): 88–101. http://dx.doi.org/10.1139/t98-090.

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Publications associated with sands are often limited to clean (i.e., little fines content), uniform, uncemented silica or quartz sand. On the other hand, the importance of mineral content, particle shapes, as well as gradation to the behavior of sand has long been recognized. Although systematic studies of sands other than clean quartz sand have been limited, there is increasing attention being paid to sands with an appreciable fines content. Because of a major construction project, extensive field and laboratory experiments were performed on a silty fine sand from Mai-Liao, which is located o

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Ward, PR, and JM Oades. "Effect of clay mineralogy and exchangeable cations on water repellency in clay-amended sandy soils." Soil Research 31, no. 3 (1993): 351. http://dx.doi.org/10.1071/sr9930351.

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Artificial water-repellent sands were prepared in the laboratory from acid-washed sand and either cetyl alcohol or organics extracted from a natural water-repellent sand. Added clays (at 0.5% w/w) had no effect when gently mixed with a natural and the two artificial water-repellent sands. After a wetting and drying cycle, kaolinite reduced repellency to a low level in the natural sand and the artificial sand with extracted organics, but montmorillonite was not effective. Na+-saturated clays were generally more effective than Ca2+-saturated clays. In the cetyl alcohol sand, montmorillonite was

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B., Padmini, Likitha B., Venkata Kamesh B., Deepika B., Jagadeesh N, and Santhosh Kumar D. "Grain Fineness Number of Various River Sands for Metal Casting." Research and Reviews: Journal of Mechanics and Machines 3, no. 1 (2021): 1–5. https://doi.org/10.5281/zenodo.4817506.

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<em>The Grain Fineness Number (GFN) is the quantitative indication of the grain size distribution of the sand Sample by carrying out sand sieve analysis. The current manuscript aims to determine the value of GFN of various river sands. I.e. to determine the suitability of sand with the physical requirements of sand moulding. Calculating the grain fineness number gives an estimate of the average grain size of the sand sample. The grain size distribution influences the properties of sand as follow refractoriness, green strength, dry strength, hot Strength, permeability, compatibility. Permeabili

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Peterson, Ivars. "Dry Sand, Wet Sand." Science News 152, no. 12 (1997): 186. http://dx.doi.org/10.2307/3980994.

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Rutherford, Steven R., and Robert H. Williams. "Amplitude‐versus‐offset variations in gas sands." GEOPHYSICS 54, no. 6 (1989): 680–88. http://dx.doi.org/10.1190/1.1442696.

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Seismic reflections from gas sands exhibit a wide range of amplitude‐versus‐offset (AVO) characteristics. The two factors that most strongly determine the AVO behavior of a gas‐sand reflection are the normal incidence reflection coefficient [Formula: see text] and the contrast in Poisson’s ratio at the reflector. Of these two factors, [Formula: see text] is the least constrained. Based on their AVO characteristics, gas‐sand reflectors can be grouped into three classes defined in terms of [Formula: see text] at the top of the gas sand. Class 1 gas sands have higher impedance than the encasing s

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Wang, Ruying, James W. Hempfling, Bruce B. Clarke, and James A. Murphy. "Sand Size Affects Topdressing Removed by Mowing and Anthracnose on Annual Bluegrass Putting Green Turf." HortScience 55, no. 2 (2020): 237–43. http://dx.doi.org/10.21273/hortsci14396-19.

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Sand size can affect the ability to incorporate topdressing into the turf canopy and thatch on golf course putting greens; unincorporated sand interferes with mowing and play. This 3-year field trial was initiated to determine the effects of sand size on sand incorporation, surface wetness, and anthracnose (caused by Colletotrichum cereale Manns sensu lato Crouch, Clarke, and Hillman) of annual bluegrass [Poa annua L. f. reptans (Hausskn) T. Koyama] maintained as a putting green. The experimental design was a randomized complete block with four replications; treatments included a non-topdresse

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M, Tjuwati, Panca Wahyudi, and Supriyatno Supriyatno. "Comparison Of Local And Import Sands Quality Laboratory Tests Results For Used In Hydraulic Fracturing Operations." Scientific Contributions Oil and Gas 31, no. 1 (2022): 34–38. http://dx.doi.org/10.29017/scog.31.1.860.

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Sand quality laboratory tests have been carried out on local and import uncoated sands. Based on results of sand sieve, roundness, sphericity, turbidity, acid solubility and crush resistance at 3000 psi quality tests of import uncoated sand has better quality than local sand. The import sand fulfills API – RP 56 specification requirements and will be able used in hydraulic fracturing operation. Whereas, the local uncoated sand does not achieve API - RP 56 specification requirements.

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Minh, Chanh Cao, and Padmanabhan Sundararaman. "Nuclear-Magnetic-Resonance Petrophysics in Thin Sand/Shale Laminations." SPE Journal 16, no. 02 (2010): 223–38. http://dx.doi.org/10.2118/102435-pa.

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Summary We discuss the use of nuclear-magnetic-resonance (NMR) logging in the petrophysical evaluation of thin sand/shale laminations. NMR helps detect thin beds, determine fluid type, establish the hydrocarbon type and volume if hydrocarbon is present, and, finally, determine the permeability of the sand layers (as opposed to that of the sand/shale system). Experiments were conducted on samples of 100% sand, 100% clay, and sand/clay layers with an NMR-logging tool at surface to verify the characteristic T2 bimodal relaxation distribution often observed in NMR logs that are acquired in thin be

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Clemens, Karen E., and Paul D. Komar. "TRACERS OF SAND MOVEMENT ON THE OREGON COAST." Coastal Engineering Proceedings 1, no. 21 (1988): 100. http://dx.doi.org/10.9753/icce.v21.100.

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The study of sand mineralogy and grain rounding can help answer many questions of immediate concern to coastal engineers or to broader issues of beach preservation. The heavy-mineral contents of sands, together with statistical techniques such as factor analysis, can be used to delineate sediment sources, trace transport paths, and map out patterns of mixing during sediment dispersal. Variations in the degree of grain rounding can similarly be used to trace sand movements, or to obtain additional information concerning the history of the sediment particles. The techniques of studying sand mine

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Lukpanov, R. E., D. S. Dyussembinov, A. D. Altynbekova, S. B. Yenkebayev, and Talal Awwad. "Assessment of the physical and mechanical characteristics of sand for the production of foam concrete using the two-stage foam injection method." Kompleksnoe Ispolzovanie Mineralnogo Syra = Complex Use of Mineral Resources 332, no. 1 (2024): 5–18. http://dx.doi.org/10.31643/2025/6445.01.

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The article presents the results of experimental studies of the properties of quarry sand to assess their suitability for use in the production of foam concrete. The sites of quarry sand extraction in the territory of the Akmola region are analyzed and their physical and mechanical characteristics are characterized. Evaluation of the physical and mechanical characteristics of sand was made for four types of sand. The main evaluation parameters were: particle size distribution, homogeneity, shrinkage, density and moisture content of sands. The results of the study showed that the physical chara

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Zhu, Fu Xian, Zhong De Shan, and Fen Liu. "Micro-Strength Analysis of Sand Mold for Casting Based on Bonded-Particle Model." Key Engineering Materials 723 (December 2016): 316–21. http://dx.doi.org/10.4028/www.scientific.net/kem.723.316.

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The micro-strength of sand mold is analyzed based on bonded-particle model (BPM) due to the reason that the strength of sand mold largely influences the final casting properties. In this study, the stress and the strength as well as the stiffness parameters of the binding bridge between the sands are obtained firstly by establishing the equivalent micro-beam model of the binding bridge between the sands. Then, the tensile strength formula of Sand Mold is derived according to the idea packing shape of particle, which is then used for discussing the relationship between the tensile strength with

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Hou, Yun Fen. "Comparison of Effect of Iron Tailing Sand and Natural Sand on Concrete Properties." Key Engineering Materials 599 (February 2014): 11–14. http://dx.doi.org/10.4028/www.scientific.net/kem.599.11.

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Mixed sands with different fineness are prepared by mixing iron tailing sand and manufactured sand at different ratio. It is shown that properties of concrete prepared with natural sand whose fineness is 2.3 are worse than that of concreter prepared with mixed sand whose fineness is between 2.6 to 3.0, but are better than that of concrete prepared with mixed sand whose fineness is 2.3. Mixed sand whose fineness is between 2.6 to 3.0 can be used in concrete.

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Holtzer, Mariusz, Rafał Dańko, Sylwester Piasny, et al. "Research on the Release of Dangerous Compounds from the BTEX and PAHs Groups in Industrial Casting Conditions." Materials 14, no. 10 (2021): 2581. http://dx.doi.org/10.3390/ma14102581.

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The assessment of the harmfulness of moulding and core sands is mainly based on investigations of compositions of gases emitted by liquid casting alloys during the mould pouring. The results of investigations of moulding sands obtained under industrial conditions are presented in this paper. A unique research stand was designed and built for this aim. It allowed us to determine emissions of gases at individual stages of casting a mass up to 50 kg. This approach enables simulation of foundry conditions. Moulding sands bound by organic binders (phenol-formaldehyde; furan), inorganic binders and

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Zhang, A., and F. Collin. "Effect of Cementation on the Cyclic Behaviour of Sands: A 3D DEM Investigation." IOP Conference Series: Earth and Environmental Science 1480, no. 1 (2025): 012116. https://doi.org/10.1088/1755-1315/1480/1/012116.

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Abstract Artificial or natural cementation introduced in sands alters the mechanical response of sand upon cyclic loading. This study uses 3D discrete element method (DEM) to evaluate the effect of cementation on the cyclic behaviour of sands. The cementation is explicitly simulated by cohesive tiny particles. The results indicate that the cementation contributes to the preservation of sand-sand contacts during the undrained cyclic loading and leads to an obvious enhancement in the liquefaction resistance of sands.

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Zhang, Yun, and Shi Quan Liu. "A Comparative Study on Silica Sands as Absorbents for the Removal of Hexavalent Chromium Ions from Aqueous Solutions." Applied Mechanics and Materials 670-671 (October 2014): 189–92. http://dx.doi.org/10.4028/www.scientific.net/amm.670-671.189.

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Silica sand is the main material in glass production. It can also be used for water purification. In this work, two types of silica sand used for the glass production were directly applied in the removal of Cr6+ from aqueous solutions. The chemical composition, loss-on-ignition, acid solubility and surface area of the two sands are compared. The results indicate that both sands are quite similar in chemical and mineral compositions. However, sand B has a higher organic content, a smaller crystalline grain size, a larger surface area and acid solubility. As a result, sand B shows a larger absor

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Been, Ken, and Michael Jefferies. "Stressdilatancy in very loose sand." Canadian Geotechnical Journal 41, no. 5 (2004): 972–89. http://dx.doi.org/10.1139/t04-038.

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Virtually all investigation of liquefaction has used undrained tests, and it has become common to represent the undrained strength in terms of a collapse surface or collapse stress ratio described by an effective friction angle. A difficulty with undrained tests is that they only allow observation of the interaction of elastic and plastic strain because of the imposed boundary condition (i.e., no drainage or zero volume change), precluding a proper understanding of an effective stress criterion for maximum undrained strength. Drained triaxial tests do not suffer from this shortcoming, and stre

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Dargai, Viktória, and László Varga. "Investigation of the Granulometric and Mechanical Properties of Inorganic Used Sand." International Journal of Engineering and Management Sciences 5, no. 2 (2020): 302–8. http://dx.doi.org/10.21791/ijems.2020.2.34.

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This paper examines the use of a modified inorganic binder in metal-alloy casting. The results of investigations regarding the effect of reusing the used sand multiple times without reclamation. The technological properties of silica sand with inorganic binders were presented, two different temperatures were applied to make the used sands. After lump crushing the inorganic used sand was recycled in order to make a new sand mixture. Our work was focused on the effect of multiple usage of inorganic used sands on the mechanical and granulometric properties prepared with modified inorganic binder.

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Guo, Yujia, Alireza Nouri, and Siavash Nejadi. "Effect of Slot Width and Density on Slotted Liner Performance in SAGD Operations." Energies 13, no. 1 (2020): 268. http://dx.doi.org/10.3390/en13010268.

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Sand production from a poorly consolidated reservoir could give rise to some severe problems during production. Holding the load bearing solids in place is the main goal of any sand control technique. The only sand control techniques that have found applications in steam assisted gravity drainage (SAGD) are some of the mechanical methods, including wire wrapped screens, slotted liners and more recently, punched screens. Slotted liner is one of the most effective mechanical sand control methods in the unconsolidated reservoir exploitation, which has proven to be the preferred sand control metho

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Rhee, Seung Whee. "A Study on Thermal Stabilization of Spent Foundry Sand." Materials Science Forum 544-545 (May 2007): 507–10. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.507.

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Thermal stabilization is used to reduce the turbidity of spent foundry sands (SFSs). Effect of stabilized temperature and thermal stabilized time in thermal stabilization is estimated by turbidity of SFSs in thermal stabilization. The turbidity of furan sand is 984 FAU and almost 15 times as high as that of other sands such as CO2 sand and green sand. Furan sand contains furan resin, but CO2 sand and green sand do not use resin chemicals. The turbidity of furan sand can be reduced by stabilization of furan resin in thermal process. In the process of thermal stabilization, fixation of furan res

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Lerche, Ian. "Leakage up Faults: Production and Supply Concerns for “Topping Up” Sands." Energy Exploration & Exploitation 23, no. 2 (2005): 93–105. http://dx.doi.org/10.1260/0144598054529987.

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This paper discusses the leakage of hydrocarbons up a fault into an overlying sand that is cut by the fault. The supply of hydrocarbons is continuous until exhaustion of the main source below the sand. At the same time that hydrocarbons can be filling the sand, production is also allowed from the sand components. Hydrocarbons may also bypass either or both components of the cut sand if their respective capacities have been reached, so that there can be a time dependent loss from the lower sand component or the upper sand component or both, as they are filled and drained by production. Numerica

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Hendronursito, Yusup, and Yogi Prayanda. "POTENSI PASIR LOKAL TANJUNG BINTANG PADA ALUMINIUM SAND CASTING TERHADAP POROSITAS PRODUK HASIL COR ALUMINIUM." JURNAL KAJIAN TEKNIK MESIN 1, no. 2 (2016): 60–68. http://dx.doi.org/10.52447/jktm.v1i2.336.

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Green sand is one of the most important components in the process of metal casting. The sand in Indonesia region is varied level of subtlety, size of sand, and shape of sand. Green sand used in the process of metal casting is possible can affect the quality of casting product. This aims to determine the potential of Tanjung Bintang sand as green sand and the quality of the product in terms of porosity defects. The research was conducted by varying sand river from Tanjung Bintang and sand from Maringgai. Composition made varying is 100%,75%, 50%, and 25% Tanjung Bintang sand compared Maringgai

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Bifano, Luca, Alice Fischerauer, and Gerhard Fischerauer. "Investigation of complex permittivity spectra of foundry sands." tm - Technisches Messen 87, no. 5 (2020): 372–80. http://dx.doi.org/10.1515/teme-2019-0121.

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AbstractThis paper discusses impedance spectroscopy as a method to characterize different types of quartz sand, chromite sand, and mixtures of sand. Based on two types of measurement cells, the impedance spectra for various dry sands were measured. The spectra differ enough to allow the sands to be distinguished. The results were validated by extracting the relative permittivity from the impedance and comparing it to literature data. After that, the method could be applied with confidence to other material systems. The influence of moisture was investigated with two types of quartz sand, and t

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., Akpabio, Idara O, Ojo ., and Odunayo T. "Characterization of hydrocarbon reservoir by pore fluid and lithology using elastic parameters in an x field, Niger delta, Nigeria." International Journal of Advanced Geosciences 6, no. 2 (2018): 173. http://dx.doi.org/10.14419/ijag.v6i2.13274.

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Quantitative rock physics analysis was carried out to determine the lithology and pore fluid of a reservoir in the Niger Delta. Density, compressional wave velocity and shear wave velocity logs were used as input to calculate elastic parameters such as velocity ratio, Poisson’s ratio, and Bulk Modulus, after estimating the hydrocarbon reservoir in the X field. The calculated velocity ratio log was used to differentiate between sand, sandstone and shale. Poisson’s ratio and velocity ratio were used delineate pore fluid content; gas sand, oil sand and sandstone formation from cross plot analysis

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Stec, K., J. Podwórny, B. Psiuk, and Ł. Kozakiewicz. "Determination of Chromite Sands Suitability for Use in Moulding Sands." Archives of Foundry Engineering 17, no. 2 (2017): 107–10. http://dx.doi.org/10.1515/afe-2017-0060.

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Abstract Using the available analytical methods, including the determination of chemical composition using wavelength-dispersive X-ray fluorescent spectroscopy technique and phase composition determined using X-ray diffraction, microstructural observations in a highresolution scanning microscope equipped with an X-ray microanalysis system as well as determination of characteristic softening and sintering temperatures using high-temperature microscope, the properties of particular chromite sands were defined. For the study has been typed reference sand with chemical properties, physical and the

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Łucarz, M., and D. Drożyński. "Influence of the reclamation method of spent moulding sands on the possibility of creating favourable conditions for gases flow in a mould." Archives of Metallurgy and Materials 62, no. 1 (2017): 359–64. http://dx.doi.org/10.1515/amm-2017-0055.

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Abstract The results of investigations concerning the influence of the applied sand matrix (fresh sand, reclaim) on the properties of moulding sands used for production of large dimensional castings (ingot moulds, ladles), are presented in the hereby paper. The performed investigations were aimed at determining the influence of various reclamation methods of spent moulding sands on the quality of the obtained reclaimed material. Moulding sands were prepared on the fresh quartz matrix as well as on sand matrices obtained after various reclamation methods. The selected moulding sand parameters w

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Feng, Deluan, Haiqin Gao, Zhanlin Li, and Shihua Liang. "The Effect of Clay on the Shear Strength of Microbially Cured Sand Particles." Materials 15, no. 10 (2022): 3414. http://dx.doi.org/10.3390/ma15103414.

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Microbial solidification of sand has obvious effects: energy-saving and environmental protection. It is a green and sustainable soil consolidation technology with low energy consumption, which meets the needs of high-quality development of modern economy and society. However, when clay is doped in sand, clay has an uncertain influence on the effectiveness of the microbial solidification of sand. Therefore, triaxial consolidation undrained tests before and after microbial solidification of sands with different clay content are carried out in this paper. The effects of clay content on the solidi

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