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 Asphalt Concrete--Evaluation Pavements--Performance--Texas Pavements Aggregates (Building Materials)
• 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.
  
  
• Format:
  PDF
• Funding:
  0-5261
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:288c2c288a28fdc1559c2f79caaa9f5cdaa4ae5a91d4a75ab05f9df926297a0a9a296503b8ad50e172025832d0ec718c7d2c0408d3e62a1e0a93ba0ce33fcfb5
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16838/dot_16838_DS1.pdf
• File Type:
  [PDF - 3.66 MB ]