01593914

Component

https://doi.org/10.3141/2579-08

The beneficial use of municipal solid waste incineration (MSWI) fly ash promotes sustainability in highway construction. This study investigated the geotechnical and chemical leaching characteristics of fresh and aged MSWI fly ash samples for use of the material in highway construction applications. The results show that the geotechnical properties of MSWI fly ash resemble those of silty sands with poor drainage capacity. Compared with fresh ash (<10 days since placement), aged ash (3 to 6 months) has a higher California bearing ratio, higher unconfined compressive strength, and greater freeze–thaw durability. The concentrations of cadmium, chromium, selenium, silver, and sulfate from water leach tests are below the limits stipulated in Wisconsin NR 538. The concentrations of heavy metals in leachate from Synthetic Precipitation Leaching Procedure tests are below the U.S. Environmental Protection Agency’s standard maximum contaminant level, with the exception of arsenic. Cumulative mass release from column leach tests indicates that fresh ash will release more heavy metals than aged ash during long-term leaching processes. According to the geotechnical and environmental test results in this investigation, aged MSWI fly ash is identified as a viable material for potential use in roadway construction.

01586597

16-1961

English

pp 70–78

2016

Transportation Research Record: Journal of the Transportation Research Board

9780309369930

Print

Figures (5) ; Photos; References (34) ; Tables (6)

California bearing ratio; Compressive strength; Embankments; Fills; Fly ash; Freeze thaw durability; Geotechnical engineering; Heavy metals; Leaching; Road construction; Solid wastes; Sustainable development

Incineration

Wisconsin

Bridges and other structures; Construction; Environment; Geotechnology; Highways; Materials

TRIS, TRB, ATRI

Jan 12 2016 4:51PM

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