BONTONITE TREATMENT FOR FUGITIVE DUST CONTROL

This research project was directed at laboratory and field evaluation of sodium montmorillonite clay (bentonite) as a dust palliative for limestone surfaced secondary roads. It was postulated that the electrically charged surfaces (negative) of the clay particles could interact with the charged surfaces (positive) of the limestone and act as a bonding agent to agglomerate fine (-#200) particulates, and also to bond the fine particulates to larger (+#200) limestone particles. Test roads were constructed in Dallas, Adair, and Tama counties in Iowa using bentonite treatment levels (by weight of aggregate) ranging from 0.5 to 9.0 percent. Quantitative and qualitative periodic evaluations of the roads were conducted with respect to dust generation, crust development, roughness, and braking characteristics. As the bentonite treatment level increased, dust generation decreased. About a 70 percent reduction can be achieved at nine percent bentonite treatment. The bentonite appears to be able to interact with new applications of limestone maintenance material and maintains a dust reduction capability.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 1-3

Subject/Index Terms

Filing Info

  • Accession Number: 00721830
  • Record Type: Publication
  • ISBN: 0065231003
  • Files: TRIS, STATEDOT
  • Created Date: Jun 3 1996 12:00AM