Determining Fatigue Endurance Limits of New Mexico Asphalt Mixes for Designing Perpetual Pavements and Implementation of MEPDG to its Full Capacity

Details

• Creators:
  Tarefder, Rafiqul A. ; Barlas, Ghazanfar
• Corporate Creators:
  University of New Mexico, Albuquerque. Department of Civil Engineering
• Corporate Contributors:
  New Mexico. Department of Transportation. Research Bureau ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Asphalt Mixtures Fatigue Limit Hot Mix Asphalt Laboratory Tests Mechanistic-empirical Pavement Design Perpetual Pavements
• Publication/ Report Number:
  NM11MSC-02
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States ; New Mexico
• Edition:
  September 1, 2010 – December 31, 2013
• Corporate Publisher:
  New Mexico. Department of Transportation
• Abstract:
  It is believed that Hot Mix Asphalt (HMA) mixtures used in long-lasting pavements contain a threshold of strain value below which no fatigue damage occurs. This concept is known as the fatigue endurance limit (FEL). Although previous studies have shown that an endurance limit does exist for HMA mixtures, an established value is yet to be determined, with values varying from 70-400 microstrain (με) based on mixture variability. This study determined the FEL of two HMA mixtures, SP-II (coarse mix) and SP-III (fine mix) using laboratory testing, which are collected from an onsite project on I-25 near Budagher. The SP-II mix with PG 64-22 and the SP-III with PG 70-22 were collected from the field, while SP-II with PG 70-22 and the SP-III mix with PG64-22 were prepared in the laboratory. All the samples were compacted in the laboratory with samples having air voids around 5.5±0.5%. Samples were conditioned and tested using a four-point bending beam apparatus. Due to time limitations, laboratory testing was conducted on selected strain amplitudes and data are used to find the FEL values using a phenomenological approach as well as a fundamental energy-based approach, the dissipated energy concept. The FEL values for the SP-II with PG 64-22 and with PG70-22 mixes are 195 and 125 με, respectively. The FEL values for the SP-III with PG 64-22 and with PG 70-22 are estimated to be 185 and 180 με respectively.
• Format:
  PDF
• Funding:
  456-325
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:143b3bb691dc99040910398385c34bec2026e94d1cdef79d9eee24037ed3cc899e94786a1aa9763539e28fbd162b550c8f1ddcd611fdcb3ba07b589e5dd827f6
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/87303/dot_87303_DS1.pdf
• File Type:
  [PDF - 5.69 MB ]