In-Place Voids Monitoring of Hot Mix Asphalt Pavements: Follow-Up

In order to validate the policy of allowing the adjustment of the asphalt cement to reduce the laboratory air voids up to one percent, cores were taken over a period of four years on 19 paving projects and tested for air voids. After being compacted by traffic over several years, the average air voids in these pavements were 3.8%. Since the design air voids are required to be between 3.5% and 4.5%, the monitoring validates the effectiveness of the policy. However, there was significant scatter in the data with most of the in-place voids falling out of this design range. The asphalt cement adjustment policy has been validated, but more guidance needs to be developed to reduce scatter. The Colorado Department of Transportation (CDOT) should consider additional guidance in making asphalt cement adjustments to achieve more consistent in-place voids. Forensic analysis of any pavement showing premature failure related to mix problems may help in developing and fine-tuning this guidance.

• Record URL:
  http://www.coloradodot.info/programs/research/pdfs/2014/voids.pdf/at_download/file
• 
• Corporate Authors:

  Colorado Department of Transportation

  Research Branch
  Denver, CO  United States  80204

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Griffin, Richard
• Publication Date: 2014-1

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; References;
• Pagination: 33p

Subject/Index Terms

• TRT Terms: Air voids; Asphalt cement; Core samples; Mix design
• Geographic Terms: Colorado
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01505861
• Record Type: Publication
• Report/Paper Numbers: CDOT-2013-19
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jan 27 2014 1:42PM