Polymer modified hot mix asphalt field trial.

Details

• Creators:
  Albritton, Gayle E. ; Barstis, William F. ; Crawley, Alfred B.
• Corporate Creators:
  Mississippi. Dept. of Transportation. Research Division
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Asphalt pavements
  • Asphalt additives
  • Additives
  • Mixtures
  • Hot mix asphalt
  • Testing
  • Evaluation
  • Pavements, Asphalt--Mississippi--Evaluation
  • Pavements, Asphalt--Mississippi--Design and construction
  • Pavements, Asphalt--Additives--Evaluation
• Publication/ Report Number:
  FHWA/MS-DOT-RD-99-111 ; MS-DOT-RD-99-111
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final report.
• Corporate Publisher:
  Mississippi. Dept. of Transportation
• Abstract:
  A problem plaguing HMA pavements is rutting, which develops because of the high summer temperatures and heavy trucks. Many different ; polymer modifiers for asphalt cement have been developed to help improve both the rutting and thermal cracking problems of HMA by altering the ; properties of the asphalt cement binder. ; The primary objective of this research was to evaluate the engineering properties and performance, especially rut resistance, of dense graded HMA ; containing specific polymer modifiers. The polymer modifiers were used in the HMA for the top two pavement layers of an HMA overlay of a ; flexible pavement The nine modifiers considered in this study included two crumb rubbers and one gelled asphalt. ; Primary conclusions and recommendations resulting from this study include the following: ; 1. Each polymer required mixing at a higher temperature than regular HMA. These temperatures ranged from 320o to 351oF. ; 2. The modified HMA mixes were successfully produced in a normal HMA production facility. Most of the modifiers did not require a blending ; unit. ; 3. Brookfield Viscometer tests showed that the modifiers were all more viscous at the lower temperatures. ; 4. Results of the GTM tests showed that the laboratory specimens had sufficient shear strength to resist the stress state in the pavement and that ; the air voids were above the flushing level and were consistent with design values. ; 5. Results to date indicate that all the modified binders are providing superior rutting resistance as compared to the control binder. This validates ; the wisdom of using modified binders for areas of high equivalent single axle loading (ESAL). Continued monitoring will help to better quantify ; the improvement provided by the modified binders. ; 6. The APA test results correlate well with field rutting measurements for most of the polymer modifiers considered in this study. This indicates ; the potential for using the APA to predict the relative rutting performance of different polymer modifiers. Research should be conducted to ; substantiate this use of the APA. ; 7. The selection of a polymer modified asphalt binder grade based on the high temperature component of the PG designation could be quite ; inappropriate for a given project, especially when crumb rubber modifiers are considered for use in the HMA.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24126/dot_24126_DS1.pdf
• File Type:
  [PDF - 2.16 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:6ac4daef04df2b371655a4608c26d409f81f0749e85ab9dd38e736b588a76c385f3a1c04e2f8114cc08ea45b23eb04376dd2257fd62c1d56b9f74b289fad19b9