EVALUATION OF BOND PERFORMANCE OF AN ULTRA-RAPID SETTING EMULSION FOR TACK COAT APPLICATIONS

Open Access
Author:
Medeiros Junior, Marcelo Silva
Graduate Program:
Civil Engineering
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
July 29, 2009
Committee Members:
  • Dr Ghassan Ryad Chehab, Thesis Advisor
  • Mansour Solaimanian, Thesis Advisor
Keywords:
  • ultra-rapid tack coat
  • shear strength
  • asphalt layers bonding
  • emulsion
Abstract:
The purpose of this study was to evaluate the bond performance of a new ultra-rapid setting emulsion (URS) relative to that of a cationic rapid setting emulsion (CRS-1h), through a host of laboratory tests. URS is a proprietary, ultra rapid-setting emulsion used as a bituminous tack coat for pavement applications. The product exhibits a very fast set time feature which distinguishes it from regular rapid setting emulsions. This is achieved by the introduction of certain additives, which speed up the water evaporation. The rapid set time is beneficial for fast-track paving projects and hence could prove to be highly cost effective. However, the adoption of such a new product as an approved replacement to typical tack coats used by PennDOT is contingent on it exhibiting bond characteristics similar to those exhibited by other rapid setting emulsions. The results indicated that the URS delivered shear strength comparable with that from the CRS-1h. Considering the fact, that the tested CRS-1h has been commonly used in construction’s tack coat applications, it appears that the URS could be reliably used in such applications with the gained benefit of faster setting