Development of quality standards for inclusion of high recycled asphalt pavement content in asphalt mixtures - phase II.

Details

• Creators:
  Lee, Hosin ; Van Winkle, Clint ; Carlson, Russell ; Mokhtari, Ali ; Ahmed, Taha ; Kim, Haena ; Tang, Sheng ; Williams, Chris
• Corporate Creators:
  University of Iowa. Public Policy Center
• Corporate Contributors:
  Iowa. Highway Research Board
• Subject/TRT Terms:
  • Asphalt pavements
  • Asphalt mixtures
  • Recycled materials
  • Standards
  • Mix design
  • Superpave
  • Stiffness tests
  • Binders
  • Transverse cracking
• Publication/ Report Number:
  TR-658
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Corporate Publisher:
  University of Iowa. Public Policy Center
• Abstract:
  To conserve natural resources and energy, the amount of recycled asphalt pavement has been steadily increasing in the construction ; of asphalt pavements. The objective of this study is to develop quality standards for inclusion of high RAP content. To determine if ; the higher percentage of RAP materials can be used on Iowa’s state highways, three test sections with target amounts of RAP ; materials of 30%, 35% and 40% by weight were constructed on Highway 6 in Iowa City. To meet Superpave mix design ; requirements for mixtures with high RAP contents, it was necessary to fractionate the RAP materials. Three test sections with actual ; RAP materials of 30.0%, 35.5% and 39.2% by weight were constructed and the average field densities from the cores were ; measured as 95.3%, 94.0%, and 94.3%, respectively. Field mixtures were compacted in the laboratory to evaluate moisture ; sensitivity using a Hamburg Wheel Tracking Device. After 20,000 passes, rut depths were less than 3mm for mixtures obtained ; from three test sections. The binder was extracted from the field mixtures from each test section and tested to identify the effects of ; RAP materials on the performance grade of the virgin binder. Based on Dynamic Shear Rheometer and Bending Beam Rheometer ; tests, the virgin binders (PG 64-28) from test sections with 30.0%, 35.5% and 39.2% RAP materials were stiffened to PG 76-22, PG ; 76-16, and PG 82-16, respectively. The Semi-Circular Bending (SCB) test was performed on laboratory compacted field mixtures ; with RAP amounts of 30.0%, 35.5% and 39.2% at two different temperatures of -18 and -30 °C. As the test temperature decreased, ; the fracture energy decreased and the stiffness increased. As the RAP amount increased, the stiffness increased and the fracture ; energy decreased. Finally, a condition survey of the test sections was conducted to evaluate their short-term pavement performance ; and the reflective transverse cracking did not increase as RAP amount was increased from 30.0% to 39.2%.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28702/dot_28702_DS1.pdf
• File Type:
  [PDF - 3.60 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:a0c27cbafc4f42e92aa25de3968f1db8278eb8d33d2c05177f9ae4a3eb2d53241ec1fd88201cd5a1e5d6084b36fc003aaa54bd9ba72a1ddea1c77d6f53f75a6c