Application of imaging technology to improve the laboratory and field compaction of HMA.

Details

• Alternative Title:
  Project title: Using imaging analysis technology to improve the laboratory and field compaction of HMA
• Creators:
  Masad, Eyad ; Kassem, Emad ; Chowdhury, Arif
• Corporate Creators:
  Texas Transportation Institute
• Corporate Contributors:
  Texas. Dept. of Transportation. Research and Technology Implementation Office
• Subject/TRT Terms:
  • Aggregates
  • Asphalt concrete
  • Pavements Aggregates (Building materials)
  • Asphalt concrete--Evaluation
  • Pavements--Performance--Texas
• Publication/ Report Number:
  FHWA/TX-09/0-5261-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Sept. 2005-May 2008.
• Corporate Publisher:
  Texas Transportation Institute
• Abstract:
  Field compaction of asphalt mixtures is an important process that influences performance of asphalt ; pavements. This study evaluates the relationship between different field compaction patterns and the ; uniformity of air void distribution in asphalt pavements. A number of projects with different hot mix asphalt ; (HMA) types were compacted, and cores were taken at different locations from these projects. The X-ray ; Computed Tomography (X-ray CT) system was used to capture the air void distributions in these cores. The ; analysis results have revealed that the uniformity of air void distribution is highly related to the compaction ; pattern and the sequence of using different compaction equipment. More importantly, the efficiency of ; compaction (reducing air voids) at a point was found to be a function of the location of this point with ; respect to the roller compactor width. ; The results in this paper have supported the development of the “Compaction Index (CI),” which ; quantifies the degree of field compaction. The CI is a function of the number of passes at a point and the ; position of the point with respect to the compaction roller width. This index was found to correlate ; reasonably well with percent air voids in the pavement. The CI calculated from field compaction had a good ; relationship with the slope of the compaction curve obtained from the Superpave gyratory compactor. This ; relationship offers the opportunity to predict field compactability based on laboratory measurements. The ; compaction of longitudinal joints was investigated, and recommendations were put forward to improve joint ; compaction. The air void distributions in gyratory specimens were related to the mixture mechanical ; properties measured using the Overlay and Hamburg tests.
  More +
• Format:
  PDF
• Funding:
  0-5261
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16838/dot_16838_DS1.pdf
• File Type:
  [PDF - 3.66 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:288c2c288a28fdc1559c2f79caaa9f5cdaa4ae5a91d4a75ab05f9df926297a0a9a296503b8ad50e172025832d0ec718c7d2c0408d3e62a1e0a93ba0ce33fcfb5