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Environmental and mechanical assessment of wood fly ash used for stabilisation of gravel roads
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
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.
Sveriges Geotekniska Institut.
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2011 (English)In: SARDINIA 2011: Thirteenth International Waste Management and Landfill Symposium; [3 - 7 October 2011, S. Margherita di Pula - Cagliari, Sardinia, Italy] ; CD-ROM: Proceedings / [ed] Raffaello Cossu, Cagliari: CISA Publisher, Italy , 2011Conference paper, Published paper (Refereed)
Abstract [en]

Due to climate change, there is a growing demand for mechanically stabilising forestry roads in Sweden. One way to do this is by addition of cement to the bearing layer of the road. In this study, cement was replaced by a forestry industry fly ash. Mechanical testing showed that a good stabilising effect could be achieved and at a 30% ash addition, it could resist more than 12 freeze-thaw cycles. The environmental impact of the ash addition was assessed using a standard leaching test at a liquid to solid ration of ten. The results indicated that most constituents of the ash remained fairly stable, but that notably chloride, potassium, calcium and sodium was mobilised in the grams per kg of TS range, adding up to about 1 % of the total mass. This may cause an elevated salinity in the emediate vicinity of a road, e g in the ditches, under a short time period, but is not considered to be a major problem for recipients. The results also indicate that the total content is a poor estimate for the leachability of various elements.

Place, publisher, year, edition, pages
Cagliari: CISA Publisher, Italy , 2011.
National Category
Other Environmental Engineering
Research subject
Waste Science and Technology
Identifiers
URN: urn:nbn:se:ltu:diva-37164Local ID: b17f01e0-eae3-46e6-b2ec-cb303f85a8b6OAI: oai:DiVA.org:ltu-37164DiVA, id: diva2:1010662
Conference
International Waste Management and Landfill Symposium : 03/10/2011 - 07/10/2011
Note

Godkänd; 2011; Bibliografisk uppgift: 1 CD-ROM; 20120309 (desnor)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2020-01-23Bibliographically approved

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Nordmark, DesireeLagerkvist, Anders

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