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Iowa’s PG Binder Grades and Traffic Design Levels Undergo a Transformation 

In October of 2016, the nomenclature for the asphalt cement binder grading system will be changed to accommodate the Mulitple Stress Creep Recovery (MSCR) test. During this transition, the Iowa DOT has seized on the opportunity to address Iowa’s numerous pavement design levels and the need to lower the “bottom end” binder grade across the state. The MSCR binder classification and the traffic design guides will utilize the “SHOVE” acronym. “S” = Standard, “H” = Heavy, “V” = Very Heavy, “E” = Extremely Heavy. In addition, Iowa will be divided into a “Southern” and “Northern” districts. The Southern district will require a PG 58-28S as the standard grade of asphalt and the Northern district will require a PG 58-34S. An easy reference guide is provided below and printed copies will also be available through the APAI. Dr. Scott Schram, IDOT Pavement Management Engineer,  has created an excellent webinar that can be viewed by clicking here. If you have questions, or would like to schedule a meeting with the APAI, please contact our offices at 515-233-0015 or email at apai@apai.net.  

 Click here for easy reference guide.

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