Effect of coal combustion fly ash use in concrete on the mass transport release of constituents of potential concern

Chemosphere
Andrew C GarrabrantsH A van der Sloot

Abstract

Concerns about the environmental safety of coal combustion fly ash use as a supplemental cementitious material have necessitated comprehensive evaluation of the potential for leaching concrete materials containing fly ash used as a cement replacement. Using concrete formulations representative of US residential and commercial applications, test monoliths were made without fly ash replacement (i.e., controls) and with 20% or 45% of the portland cement fraction replaced by fly ash from four coal combustion sources. In addition, microconcrete materials were created with 45% fly ash replacement based on the commercial concrete formulation but with no coarse aggregate and an increased fine aggregate fraction to maintain aggregate-paste interfacial area. All materials were cured for 3 months prior to mass transport-based leach testing of constituents of potential concern (i.e., Sb, As, B, Ba, Cd, Cr, Mo, Pb, Se, Tl and V) according to EPA Method 1315. The cumulative release results were consistent with previously tested samples of concretes and mortars from international sources. Of the 11 constituents tested, only Sb, Ba, B, Cr and V were measured in quantifiable amounts. Microconcretes without coarse aggregate were determined to be...Continue Reading

References

Sep 3, 2010·Environmental Science & Technology·Susan A ThorneloeGregory Helms

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Citations

Jan 25, 2016·Journal of Environmental Management·Chaichan SiriruangSomnuk Tangtermsirikul
Sep 5, 2015·Journal of Hazardous Materials·Justin G RoesslerChristopher C Ferraro
Apr 15, 2015·Environmental Science and Pollution Research International·Natalya IrhaRein Kuusik
Oct 9, 2019·Journal of Exposure Science & Environmental Epidemiology·Lisa J Goodwin RobbinsRobin E Dodson
May 10, 2019·Environmental Science and Pollution Research International·Xiang-Hua FengShi-Min Ding
Feb 13, 2021·Environmental Science and Pollution Research International·Jay E RenewChing-Hua Huang
May 4, 2017·Waste Management·Aruna Ukwatta, Abbas Mohajerani
Jun 28, 2019·Environmental Science & Technology·Kyle A ClavierTimothy G Townsend

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