Effects of a Wax-Based Warm Mix Additive on Cohesive Strengths of Asphalt Binders

Despite the positive effects, the use of wax-based warm mix additive is very limited due to the concerns on cohesion and adhesion properties. The objective of this study is to evaluate the cohesive strengths of asphalt binders with and without Sasobit®, a wax-based warm mix additive using a pneumatic adhesion tensile testing instrument (PATTI) and using surface free energy method from optical advancing contact angle measurements. Two asphalt binders, PG 64-22 and PG 76-22M with and without 2% Sasobit® were coated in 2”X2”X1/4” glass plates. Cohesive strengths of asphalt binders were obtained in terms of pull-off tensile strength (POTS) using ½ in diameter pull-stubs. It was observed that the cohesive strengths of PG64-22 and PG76-22M are 1.964 MPa (284.9±21.3 psi) and 2.067 MPa (299.9±15.3 psi), respectively. Sasobit® reduced the cohesive strengths to 1.468 MPa (212.9±11.3 psi) and 1.503 MPa (218.0±17.7 psi), respectively for PG 64-22 and PG 76-22M. The cohesive strengths (free energy of cohesion) obtained from surface free energy measurements indicate that PG 64-22 has higher cohesive strengths and Sasobit® increases the cohesive strengths of both the binders. Overall, pull-off test was found to be simple and reproducible.

• Record URL:
  https://doi.org/10.1061/41167(398)51
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784411674
• Supplemental Notes:
  • Copyright © 2011 ASCE
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Wasiuddin, N
  • Saltibus, N
  • Mohammad, L
• Conference:
  • First Congress of Transportation and Development Institute (TDI)
  • Location: Chicago IL, United States
  • Date: 2011-3-13 to 2011-3-16
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Digital/other
• Features: Photos; References; Tables;
• Monograph Title: Transportation and Development Institute Congress 2011 : Integrated Transportation and Development for a Better Tomorrow

Subject/Index Terms

• TRT Terms: Adhesion; Asphalt additives; Binder content; Bituminous binders; Cohesive strength; Laboratory tests; Tensile strength; Warm mix paving mixtures; Waxes
• Identifier Terms: Pneumatic Adhesion Tensile Testing Instrument
• Subject Areas: Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01347217
• Record Type: Publication
• ISBN: 9780784411674
• Files: TRIS, ASCE
• Created Date: Aug 8 2011 2:09PM