Geochemical Behavior of a Gravel Road Upgraded with Wood Fly Ash

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 SO₄ 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.

• Record URL:
  https://doi.org/10.1061/(ASCE)EE.1943-7870.0000821
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/8675387
• Supplemental Notes:
  • © 2014 American Society of Civil Engineers.
• Authors:
  • Nordmark, Désirée
  • Vestin, Jenny
  • Lagerkvist, Anders
  • Lind, Bo B
  • Arm, Maria
  • Hallgren, Per
• Publication Date: 2014-10

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 05014002
• Serial:
  • Journal of Environmental Engineering
  • Volume: 140
  • Issue Number: 10
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9372
  • Serial URL: http://ojps.aip.org/eeo

Subject/Index Terms

• TRT Terms: Environmental impacts; Fly ash; Geochemistry; Gravel roads; Infiltration; Leaching; Stability (Mechanics)
• Geographic Terms: Sweden
• Subject Areas: Environment; Highways; Materials; I15: Environment; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 01538804
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Sep 26 2014 2:24PM