Developments in Waterborne Acrylic Coatings for Concrete Highway Barriers

Durability of concrete is an important concern of concrete highway barriers and dividers. Water, although important for concrete hydration and hardening, can also play a role in decreasing the durability of concrete. Water not consumed in the hydration reaction will remain in the microstructure pore spaces and create tiny capillaries. In areas subjected to freezing/thawing, water containing deicing chemicals is drawn into the concrete through these capillaries. This external source of alkali reacts with the amorphous silica in the aggregates to form an alkali-silica gel. As this gel swells, causing an increase in pressure, expansion, and cracking of the aggregate, the concrete cracks and shows signs of spalling. Such deterioration ultimately adds costs for maintenance and replacement of concrete barriers. To prevent this deterioration, many DOTs in the United States specify a pigmented coating for concrete barriers on their Qualified Products List. With increasingly stringent health, safety, and environmental regulations, waterborne coating systems offer coatings users a safe, effective method for protecting their structures. This article describes development of a new waterborne elastomeric acrylic (WEA) resin designed specifically to survive the thermal rigors a coating for highway barriers must endure. The article first explains how a WEA resin became the focus of the study, and then describes testing of a coating based on the new resin against a variety of commercially available highway barrier coatings.

  • Availability:
  • Authors:
    • Bacho, Anne M
    • Procopio, Leo J
  • Publication Date: 2007-1

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References;
  • Pagination: pp 42-56
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01045111
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 20 2007 9:59AM