Moisture sensitivity of hot mix asphalt (HMA) mixtures in Nebraska : phase II.

Details

• Creators:
  Pinto, Ingryd ; Kim, Yongrak ; Ban, Hoki
• Corporate Creators:
  University of Nebraska--Lincoln
• Corporate Contributors:
  Nebraska. Dept. of Roads
• Subject/TRT Terms:
  • Moisture damage
  • Pavement performance
  • Asphalt additives
  • Hot mix asphalt
  • Asphalt concrete
  • Performance tests
  • Binders
  • Calcium hydroxide
  • Fly ash
  • Asphalt concrete--Moisture
  More +
• Publication/ Report Number:
  MPM-04
• Resource Type:
  Tech Report
• Geographical Coverage:
  Nebraska
• Corporate Publisher:
  Nebraska Transportation Center
• Abstract:
  As a consequential effort to the previous NDOR research project (P564) on moisture damage, this report presents ; outcomes from this project incorporated with the previous project. Performance changes and fundamental material ; characteristics associated with moisture damage due to various anti-stripping additives in asphalt mixtures are studied ; through various experimental approaches and a numerical simulation. Three additives (i.e., one reference additive, ; hydrated lime, and two alternative additives: fly ash and cement) are investigated by adding them into two types of mixes ; (SP2 for low-traffic-volume roadways and SP5 for high-traffic-volume roadways) where two different asphalt binders ; (PG 64-22 for the SP2 mix and PG 70-28 for the SP5) are used. Two asphalt concrete mixture scale performance tests, the ; AASHTO T-283 and the APA under water, and two local-scale mixture constituent tests, the boiling water test (ASTM D ; 3625) and the pull-off test, are conducted to characterize the effects of binder-specific anti-stripping additives on the ; binder-aggregate bonding potential in mixtures. The pull-off tensile strength tests are then numerically modeled through ; the finite element technique incorporated with the cohesive zone modeling approach to seek more fundamental scientific ; insights into the effect of each anti-stripping additive on the overall moisture damage resistance. Results from laboratory ; tests and numerical simulations indicate that the SP5 mixtures, where high-quality aggregates and polymer-modified ; binder are used, are fairly self-resistant to moisture damage without treating any anti-stripping additive and do not show ; any visible sensitivity among additives, whereas the effects of additives and their sensitivity are significant in the SP2 ; mixes that use the unmodified binder PG 64-22 and low-quality aggregates. With the limited amount of test data, ; hydrated lime seems to perform slightly better than other additives, particularly with longer moisture-conditioning time. ; Fly ash contributes to reducing moisture damage by improving binder-aggregate interfacial properties, which are ; validated from the integrated experimental-computational evaluation.
  More +
• Format:
  PDF
• Funding:
  26-1107-0106-001
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25601/dot_25601_DS1.pdf
• File Type:
  [PDF - 1.94 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:250fb7a3fd51e97644528377e4a644a6bbd67b1b8bb39b5213bbca3bfcb57834b3e0b9aa00177e34ed158c6f3d6c31492cfb2b8ff84424697c6d3945b8b83aae