News: ISSA News

ISSA's Updated A115 Guideline Now Available

Tuesday, July 30, 2019  

After extended discussion and feedback from across the ISSA Technical Committee, Board members, membership, and the pavement preservation industry, we are releasing a new ISSA pavement preservation Guideline, "Recommended Performance Guideline for Polymer-Modified Emulsified Asphalt Slurry Seal,  A115 - Provisional".   This Guideline has been anticipated by agencies for many months as a next generation, non-rut filling slurry surfacing system for their pavement preservation toolbox.   As a provisional Guideline, ISSA encourages feedback from across the industry as A115 is utilized to write specifications and put into practice on projects around the globe.    

Feedback will be gathered for a minimum of two years, recognizing that it is only through practical application and participation in this process by industry that we can develop Guidelines that accurately reflect best practices to meet industry's pavement preservation objectives.   Feedback will be considered, discussed, and decisions made by the technical committee to reflect final impact on the standard Guideline that accurately represents those best practices.

As you begin to examine the new Guideline, highlights include but are not limited to options for asphalt choice, residual asphalt recovery options, higher sand equivalent value requirements, tighter mix design performance expectations, and heavier application rates for both Type II and Type III systems.  Note that this new Guideline is "not to be utilized for reprofiling, leveling, or rut filling applications.  

As with all ISSA Guidelines, it is imperative that the NOTICE on the cover page is taken with the seriousness that it deserves: "It is not intended or recommended that this Guideline be used as a verbatim specification.  It should be used as an outline, helping user agencies establish their particular project specification.  Users should understand that almost all geographical areas vary as to the availability of materials.  An effort should be made to determine what materials are reasonably available, keeping in mind system compatibility and specific job requirements. Contact ISSA for answers to questions and for a list of ISSA member contractors and companies."   Additionally, this Guideline should be utilized to derive project specifications through a collaborative effort between local agencies and contractors that are reflective of climatic conditions for the geographic location where the project will be located.   

We look forward to hearing from you as the Guideline is put into practice across the globe.   

Download A115 Guideline


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