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
  • Pavements Aggregates (Building materials)
  • Asphalt concrete--Evaluation
  • Pavements--Performance--Texas
• 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.
  More +
• Format:
  PDF
• Funding:
  0-5261
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/16836/dot_16836_DS1.pdf
• File Type:
  [PDF - 1.32 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:f72d91bc635c4abdfe0a3a8de8a18d1af3985962e6f75daa51806ea3d838160f68a6134ea6f0eed3f8320f2237b585940be14296b188f126593e74d86e87987b