Hot Mix Asphalt Gradation Acceptance Review of QC/QA Data 2000 Through 2005

Details

• Creators:
  Chavez, Eric
• Corporate Creators:
  Colorado. Department of Transportation. Applied Research & Innovations Branch
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Aggregate Gradation Calculation Data Collection Hot Mix Asphalt Incentive/Disincentive Payments (I/DP) Incentives Joint Density Joints Mat Density Pavement Performance Percent Asphalt Percent Within Limits Quality Assurance Quality Control Quality Levels Standard Deviation Testing

  More +
• Publication/ Report Number:
  CDOT-2007-4
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Colorado
• Edition:
  Final Report
• Corporate Publisher:
  Colorado Department of Transportation. Applied Research & Innovations Branch
• Abstract:
  Improvements can be measured in the hot mix asphalt results from 2001 through 2005. The overall results when reviewing the Calculated Pay Factor Composite calculations show an improvement of 0.7% over the five years. The quality levels for each of the individual elements have all increased. Asphalt content has a calculated improvement of 2.36% in quality levels over the five-year time period. The overall quality level for this element is 91.53%. Mat density showed an improvement of 1.71% in quality levels over the five-year time period. This element has consistently had the best reported quality levels. The average quality level over the last five years for this element is 93.28%. The gradation element showed more improvement than either asphalt content or mat density. The quality levels for this element improved by 3.53% over the last five years. However, this element has had reported quality levels that were lower than those reported in the asphalt content and mat density elements. The five-year average quality level for this element is 87.80%. Joint density has been a testing requirement since in 2003. This element has shown very good improvement over the three-year time period. The quality levels have improved by a calculated amount of 7.66% in three years. The three-year average quality level for this element is 86.06%. The pay factors for each of the elements have also increased. The results for 2005 show the highest pay factors in each of the elements for any year. On average, incentive payments of 3.1%, 3.4%, & 1.9% were paid on the asphalt content, mat density, and gradation elements respectively in 2005. The pay factor for joint density has shown good improvement in the three years. The pay factor in 2005 was just slightly under the neutral mark of 1.0. Approximately half of the projects received an incentive on this element in 2005. Improvements can also be seen when evaluating the data by grading. Both grading S and SX have shown improvements in all of the test elements.
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ada1b09d47eb3c65490942424334a602c7779043913229daf88a88e19e5f2a207d553a385b52745d7ba5a4d2df8bd4693d0be17ff08de9b45578d174f2cdec5c
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/93074/dot_93074_DS1.pdf
• File Type:
  [PDF - 4.65 MB ]