A method for predicting asphalt mixture compactability and its influence on mechanical properties.

Details

• Creators:
  Masad, Eyad ; Kassem, Emad ; Chowdhury, Arif ; You, Zhanping
• 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-09/0-5261-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Edition:
  Technical report; Jan. 2008-Aug. 2008.
• Corporate Publisher:
  Texas Transportation Institute
• Abstract:
  This project aimed at providing better understanding of the factors affecting the uniformity and level
  
  of compaction; and the performance of asphalt pavements. TxDOT research report 0-5261-1 documented
  
  some of the findings of this research project. This research report documents the efforts and findings of
  
  experiments conducted with more test sections. In the first phase of this report, a number of field test sections
  
  were compacted, and field cores were extracted. These cores were scanned using X-ray Computed
  
  Tomography (X-ray CT) to capture the air void distributions in these cores. The air void distribution
  
  correlated well with the compaction effort across the mat. The compaction effort was found to be a function
  
  of the number of roller passes and the relative location of each pass across the mat. The Compaction Index
  
  (CI) developed in the TxDOT research report 0-5261-1 was used to quantify the compaction effort at any
  
  point in the pavement. This index combines the number of roller passes along with the effectiveness of each
  
  pass on the mat. The compactability of asphalt mixtures in the field correlated well with compactability of
  
  asphalt mixtures in the laboratory. The CI was used to quantify the compactability of asphalt mixtures in the
  
  field while the slope of the compaction curves obtained from Superpave Gyratory Compactor was used to
  
  quantify the compactability of asphalt mixtures in the laboratory.
  
  In the second phase of this report, the effect of different levels of compaction on the performance of
  
  asphalt mixtures was studied using a fracture mechanics approach and DEM models. The results showed that
  
  test specimens with less percent air voids performed better than the ones with higher percent air voids. In
  
  addition moisture-conditioned specimens performed worse than the dry ones at the same compaction levels.
  
  Furthermore, guidelines were developed to assist in predicting the compactability in the field based on
  
  laboratory measurements during the mixture design stage; and to improve the field compaction.
  
  
• Format:
  PDF
• Funding:
  0-5261
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f72d91bc635c4abdfe0a3a8de8a18d1af3985962e6f75daa51806ea3d838160f68a6134ea6f0eed3f8320f2237b585940be14296b188f126593e74d86e87987b
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16836/dot_16836_DS1.pdf
• File Type:
  [PDF - 1.32 MB ]