dr. haleh azari aashto advanced pavement research laboratory (aaprl) permanent deformation...

Download Dr. Haleh Azari AASHTO Advanced Pavement Research Laboratory (AAPRL) Permanent Deformation Characterization Using Incremental Repeated Load Permanent Deformation

Post on 16-Dec-2015

214 views

Category:

Documents

2 download

Embed Size (px)

TRANSCRIPT

  • Slide 1
  • Dr. Haleh Azari AASHTO Advanced Pavement Research Laboratory (AAPRL) Permanent Deformation Characterization Using Incremental Repeated Load Permanent Deformation Test (iRLPD) NEAUPG Steering Committee Meeting March 2012 1
  • Slide 2
  • RLPD Test Protocol Background A flow number test protocol was developed during NCHRP 9-19, which was later, refined during NCHRP 9-29 (AASHTO TP 79) Several parameters were left undetermined and not standardized FHWA ETG has created a task force to standardize the variables of the test such as test temperature, stress level, confinement Establish criteria that can reliably discriminate between various mixtures
  • Slide 3
  • Selection of Promising RLPD Protocols Different agencies have offered different approaches in standardizing the flow number test Six promising approaches were selected by the ETG Flow Number Task Force for further evaluation Selected methods are proposed by AAT (NCHRP 9-33), NCAT, Van Quintus (NCHRP 9-30A), MTE, AAPRL, UNR Nine different mixtures representing a wide range of traffic and climate were provided by the state DOTs and industries for the evaluation AAPRL is testing the nine materials according to five of the proposed methods UNR is testing the materials according to UNR proposed method
  • Slide 4
  • Mix. # MixtureTrafficBinder GradeMixture NMAS, mmSupplier LTPPBind High Temperature, 50% Reliability, C 1WI (E3)
  • Table 1-Ranges of MSR values for various Traffic levels 26 Axels MSR, strain/cycle 10 & 3 & 1 & < 3 >50,000,000
  • Selection of Mixtures, Example 29 High pavement temperature for Region 1 from LTPPBind= 62.7C Use stress of 600 kPa (0.6 Mpa) TP= 62.7 * 0.6= 37.6 MPa C MSR from master curve= 12.5 (> 10 &

Recommended

View more >