Geotechnical and leaching properties of flowable fill incorporating waste foundry sand

Deng, An; Tikalsky, Paul J.

doi:10.1016/j.wasman.2007.09.018

Cited by 87 publications

(37 citation statements)

References 15 publications

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“…Despite these benefits, the beneficial use WFSs has been constrained by many local and state governments due to uncorroborated concerns over potential contamination with metals. However, recent research has shown that the majority of foundry sands are a low contaminate waste with a low leaching potential when beneficially used in unencapsulated applications (Guney et al, 2006;Deng and Tikalsky, 2008;Stehouwer et al, 2010). Table 4 presents a comparison of mean concentrations of critical trace metals in WFSs and North American surface soils to soil screening levels (SSLs) used in Argentina.…”

Section: Resultsmentioning

confidence: 99%

Analysis of total metals in waste molding and core sands from ferrous and non-ferrous foundries

Miguel

Ippolito

Leytem

et al. 2012

Journal of Environmental Management

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a b s t r a c tWaste molding and core sands from the foundry industry are successfully being used around the world in geotechnical and soil-related applications. Although waste foundry sands (WFSs) are generally not hazardous in nature, relevant data is currently not available in Argentina. This study aimed to quantify metals in waste molding and core sands from foundries using a variety of metalebinder combinations. Metal concentrations in WFSs were compared to those in virgin silica sands (VSSs), surface soils and soil guidance levels. A total analysis for Ag, Al, Ba, Be, Cd, Co, Cr, Cu, Fe, Mg, Mn, Mo, Ni, Pb, Sb, Te, Tl, V, and Zn was conducted on 96 WFSs and 14 VSSs collected from 17 small and medium-sized foundries. The majority of WFSs analyzed, regardless of metal cast and binder type, contained metal concentrations similar to those found in VSSs and native soils. In several cases where alkyd urethane binder was used, Co and Pb concentrations were elevated in the waste sands. Elevated Cr, Mo, Ni, and Tl concentrations associated with VSSs should not be an issue since these metals are bound within the silica sand matrix. Because of the naturally low metal concentrations found in most WFSs examined in this study, they should not be considered hazardous waste, thus making them available for encapsulated and unencapsulated beneficial use applications.Published by Elsevier Ltd.

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Section: Resultsmentioning

confidence: 99%

Analysis of total metals in waste molding and core sands from ferrous and non-ferrous foundries

Miguel

Ippolito

Leytem

et al. 2012

Journal of Environmental Management

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“…In recent years, WFS has been used in many fields such as: component of flowable fills, 2) concrete manufacturing, 1),3), 4) red clay bricks, 5) but few works are done to put WFS into the field of ceramic. 6) Mullite ceramics have been extensively studied because of their excellent properties like high melting point (1830°C), moderate thermal expension coefficient (4.5 © 10 ¹6 K ¹1 ), good resistance to thermal shock and low thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Preparation of mullite-zirconia composites from waste foundry sand and alumina

Xiang

et al. 2015

J. Ceram. Soc. Japan

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Waste foundry sand (WFS) collected from lost foam casting (LFC) is adopted to prepare low cost mullite-zirconia composites with the addition of alumina by reaction sintering. The mixture samples of WFS and alumina as well as samples containing only WFS are sintered from 1200 to 1600°C. Thermal shock behaviors are evaluated by cool water quenching test with temperature differentials (¦T) between 2001000°C and 14 repeated cycles for ¦T = 1000°C. The degree of damage with thermal shock severity is measured through dynamic elastic modulus E using the impulse excitation method. The result shows that mullitezirconia composites can be successfully manufactured at 1500 and 1600°C, but the thermal shock (TS) resistance for composites sintered at 1600°C is not satisfied. The critical temperature gradient (¦T c ) is below 200°C, and after three TS cycles with ¦T = 1000°C, the E/E 0 reduced to a nearly constant.

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“…In the past two decades, waste foundry sand (WFS) has been widely reused as beneficial construction materials in civil engineering domain, e.g., cement concrete (Naik et al 2003), asphalt concrete (Bakis et al 2006), highway embankment , earth fills (Deng and Tikalsky 2008), and hydraulic barrier ). This study was another attempt exploring a WFS-based earth fill incorporating expanded polystyrene (EPS) beads, which were used to reduce the weight and enhance the frost resistance of the earth fill.…”

Section: Introductionmentioning

confidence: 99%

Effects of Freeze-Thaw Action and Composition on Compression Strength of WFS-FA-EPS Fills

Deng

He²,

Wang³

2010

Paving Materials and Pavement Analysis

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A frost-resistant earth fill was proposed by mixing waste foundry sand (WFS), fly ash (FA), expandable polystyrene (EPS) beads, Portland cement and water in proportions, which was known as WFS-FA-EPS fill. This study examined the unconfined compressive strength (UCS) weakening susceptibility of a range of WFS-FA-EPS specimens prepared at designated compositions which were exposed to freeze-thaw (F-T) cycling from 20 ºC to −15 ºC and up to 5 times. It was found that the inclusion of EPS reduced the unit weight of the fill materials by 20-40%. The majority of UCS loss was found suffered in the first F-T impact. Cement component clearly enhanced the anti-frost capability of materials. Components of EPS and FA also improved the F-T resistance of materials. Water was the main factor leading to F-T impairment, and should be prudentially added into the mixture. Inclusion of EPS beads was able to mitigate the frost impact by the means of reducing UCS loss. The optimal contents were 1.08% for EPS bead and 30% for FA.

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Geotechnical and leaching properties of flowable fill incorporating waste foundry sand

Cited by 87 publications

References 15 publications

Analysis of total metals in waste molding and core sands from ferrous and non-ferrous foundries

Analysis of total metals in waste molding and core sands from ferrous and non-ferrous foundries

Preparation of mullite-zirconia composites from waste foundry sand and alumina

Effects of Freeze-Thaw Action and Composition on Compression Strength of WFS-FA-EPS Fills

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