Relationship Between Aggregate Properties and Hamburg Wheel Tracking Results

Details

• Creators:
  Solaimanian, Mansour ; Pendola, Ginamarco Renato ; Kennedy, Thomas W.
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Corporate Contributors:
  Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Abrasion Aggregate Gradation Aggregates Compaction Compactors Gravel Hot Mix Asphalt Igneous Rocks Limestone Aggregates Mix Design Sandstones Soundness Test

  More +
• Publication/ Report Number:
  FHWA/TX-04/7-4977-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; Texas
• Corporate Publisher:
  Texas. Department of Transportation
• Abstract:
  Aggregates, through internal friction, must transmit the wheel loads to the underlying layers and also be resistant to abrasion and polishing due to traffic. Aggregates are subject to crushing and abrasive wear during manufacturing, placing, and compacting hot mix asphalt concrete (HMAC), and, therefore, must be hard and tough to resist degradation and disintegration at different stages. A series of different tests are used to ensure that aggregates carry required characteristics for use in HMAC. Within the last few years, the Texas Department of Transportation (TxDOT) has been using the Hamburg Wheel Tracking Device (HWTD) to evaluate the moisture susceptibility of HMAC. During these tests, it was noticed that softer aggregate underwent severe abrasion under the wheels of the HWTD. Therefore, a research study was sponsored by TxDOT for a period of one year to evaluate the relationship between aggregate properties and the results from the HWTD. Three limestone, four gravel, one sandstone, and three igneous rocks were considered in the study. These eleven aggregates provided a relatively good coverage of different aggregate types used in Texas. A series of tests were performed on the aggregates. The tests included magnesium sulfate soundness, Micro-Deval loss, L.A. abrasion, British Pendulum polish value, and acid insoluble residue. Asphalt-aggregate mixtures were prepared according to specific mix designs received from various districts. The mixtures were compacted with a Superpave gyratory compactor. The prepared specimens were tested with the HWTD. The HWTD tested specimens were evaluated by the British Pendulum equipment to quantify the aggregate polishing caused by HWTD. The final step included performing gradation analysis on the extracted aggregates to evaluate the changes from the original gradation caused by the damage and degradation produced by HWTD. In general, based on the results of the HWTD, limestone aggregates exhibited the highest level of degradation and gravel aggregates demonstrated the toughest resistance to degradation. At the same time, in general, limestone aggregates exhibited better resistance against moisture damage compared to gravel aggregates.
• Format:
  PDF
• Funding:
  7-4977
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:82a211b5a3526831b83f7a9c9545ae59e638f863bfcc1c2bd296e0f2399b41d92f8173461fa3af0c10c19da59f3298222cefb3a2a4105ccea14c97e2c94b8ec6
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/88705/dot_88705_DS1.pdf
• File Type:
  [PDF - 35.25 MB ]