Use of Sweep Test for Emulsion and Hot-Asphalt Chip Seals: Laboratory and Field Evaluation

In 2011 ‘Manual for Emulsion-Based Chip Seals for Pavement Preservation’, sweep test is recommended as one of the laboratory test methods for chip seal design and construction. Currently, sweep test is considered to be a promising test for emulsion-based chip seals. To this end, the objective of this study is to evaluate the sensitivity of sweep test for both emulsions and hot asphalts with respect to aggregate mineralogical types, aggregate precoating, aggregate moisture content, asphaltic materials type and application rates of asphaltic materials. For field evaluation, fifteen chip seal test sections were prepared with three asphaltic materials and five aggregates in a 9-acre parking lot. After two years of construction, each of the fifteen sections was visually inspected primarily for aggregate loss and bleeding and was given a distress rating. The percent aggregate loss from sweep test was compared with the field distress rating. The results indicate that shale lightweight is better than any crushed stone while clay lightweight performed worst among the six aggregates tested using sweep test. Precoated aggregates performed better with hot asphalt than emulsion. Between the two hot asphalts, PAC-15 performed better than AC20-5TR. In case of hot asphalt, percent aggregate loss increases as moisture content increases in oven dry, air dry and saturated surface dry aggregate. However, for emulsion, air dry aggregates performed the best. For both emulsion and hot asphalt, an increase in asphaltic materials application rate reduces the percent aggregate loss significantly. In field evaluation, distress survey ranking matched with sweep test results except for one CRS-2P section and one PAC-15 section. Finally, three replicates were used in this study and overall, the results indicate that sweep test using both emulsions and hot asphalts can be an effective tool for evaluation of performance of chip seals with respect to aggregate mineralogy, precoating, aggregate moisture content, types of asphaltic materials, application rates of asphaltic materials, and later field distresses.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AHD20 Pavement Maintenance
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Wasiuddin, Nazimuddin Mohammad
  • Marshall, Amanda
  • Saltibus, Nibert E
  • Saber, Aziz
  • Abadie, Christopher David
  • Mohammad, Louay N
• Conference:
  • Transportation Research Board 91st Annual Meeting
  • Location: Washington DC, United States
  • Date: 2012-1-22 to 2012-1-26
• Date: 2012

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 16p
• Monograph Title: TRB 91st Annual Meeting Compendium of Papers DVD

Subject/Index Terms

• TRT Terms: Asphalt emulsions; Bleeding (Pavements); Chip seals; Moisture content; Pavement distress; Precoated aggregates
• Subject Areas: Highways; Maintenance and Preservation; Pavements; I60: Maintenance;

Filing Info

• Accession Number: 01372808
• Record Type: Publication
• Report/Paper Numbers: 12-4459
• Files: TRIS, TRB
• Created Date: Jun 15 2012 4:04PM