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Geochemical Behavior of a Gravel Road Upgraded with Wood Fly Ash
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Sveriges Geotekniska Institut.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0001-7158-4662
Sveriges Geotekniska Institut.
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2014 (English)In: Journal of environmental engineering, ISSN 0733-9372, E-ISSN 1943-7870, Vol. 140, no 10, article id 5014002Article in journal (Refereed) Published
Abstract [en]

An insufficient bearing capacity of gravel roads is a common problem in Sweden during thaw periods. In this study, a gravel road at Timrå in central Sweden was mechanically stabilized by mixing 30% wood fly ash into the road base material. Testing of pollutant mobilization was performed both in the lab and at the field site over three years. The differences at a given liquid-to-solid ratio reached several orders of magnitude for some elements. K, Ca, Cl, and SO 4 were easily mobilized and found at elevated concentrations in leachate from the road one year after the road was stabilized. Two years after stabilization, the concentrations had returned to background levels. The stabilization also impacted the infiltration capacity of the road, reducing it by a factor of four. The weathering of Mg, Cu, and Zn from surrounding soil was higher, while the leaching of Al and K was higher from the amended road. Using fly ash in this fashion did not result in any noticeable adverse environmental impacts

Place, publisher, year, edition, pages
2014. Vol. 140, no 10, article id 5014002
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-10120DOI: 10.1061/(ASCE)EE.1943-7870.0000821ISI: 000342230500001Scopus ID: 2-s2.0-84911371090Local ID: 8ddfa25a-ce2d-4605-9691-95a7999f52e6OAI: oai:DiVA.org:ltu-10120DiVA, id: diva2:983060
Note
Validerad; 2014; 20140623 (desnor)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Nordmark, DesireeLagerkvist, Anders

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