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:
  Additives Asphalt Additives Asphalt Pavements Evaluation Hot Mix Asphalt Mixtures Pavements, Asphalt--Additives--Evaluation Pavements, Asphalt--Mississippi--Design And Construction Pavements, Asphalt--Mississippi--Evaluation Testing
• 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.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:82c90fdda74d48bbbfd571a2f507bd7c52cf310dbe3f5f7dd5898c6f0e58b166
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24126/dot_24126_DS1.pdf
• File Type:
  [PDF - 2.16 MB ]