File(s) under permanent embargo
Suitability of remediated heat-treated soil in concrete applications
journal contribution
posted on 2023-02-05, 22:22 authored by A Fehervari, Alastair MacLeodAlastair MacLeod, Chathuranga GallageChathuranga Gallage, Frank CollinsFrank Collins, Damien CallahanDamien Callahan, Will GatesWill GatesSignificant quantities of soil are adversely impacted by organic contaminants, including per- and poly-fluoroalkyl substances (PFAS). One proven technology for remediating PFAS affected soils is excavation and heat-treatment which destroys the PFAS, but renders the soil as an industrial waste that is normally diverted to landfill. This study investigated alternative uses for heat-treated industrial waste (HIW) soils as components in concrete, as aggregate replacement and as partial substitution of cement binder. At a replacement rate of 100% fine aggregate and ≈15% coarse aggregate, concretes made with HIW soil exhibited a strength of 47.2–48.3 MPa after 28 days’ curing, compared with a reference concrete of 49.7–53.1 MPa, making the HIW ideal for aggregate replacement. Overall, the study demonstrated a novel, holistic approach to (1) remediating PFAS-affected soils, (2) diverting contaminated soil away from landfill, (3) reducing the use of high quality quarried concrete aggregates and (4) producing normal-strength concretes with a lower embodied carbon footprint than existing approaches. This study reveals that in Australia, up to 93% of all contaminated soil currently sent to landfill annually could instead be used a resource for mid-strength concretes, suitable for many applications.
History
Journal
Journal of Environmental ManagementVolume
329Article number
ARTN 117076Location
EnglandPublisher DOI
ISSN
0301-4797eISSN
1095-8630Language
EnglishPublication classification
C1 Refereed article in a scholarly journalPublisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTDUsage metrics
Keywords
Science & TechnologyLife Sciences & BiomedicineEnvironmental SciencesEnvironmental Sciences & EcologyAggregate replacementSCMPoly-and per-fluoroalkyl substancesPFASConcreteLandfill alternativesCEMENTDISSOLUTIONSOLUBILITYBEHAVIORPoly- and per-fluoroalkyl substancesIndustrial WasteSoilHot TemperatureConstruction MaterialsFluorocarbons15 Life on LandSchool of Life and Environmental SciencesInstitute for Frontier MaterialsFaculty of Science Engineering and Built EnvironmentEnvironmental Science and Management not elsewhere classified
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC