Asphalt Institute Academy
ISSA Innovation Through Preservation


Price: $FREE


Mix designs are an integral part of the overall performance of Slurry Seal, Microsurfacing and Chip Seals. For mix design of Slurry Seals and Micros, there are several recommended sources including ASTM D3910ISSA A-105 & ISSA A-143, and MS-19 Basic Asphalt Emulsion Manual. In the lab, blending of the materials that are to be used in the field is done in varying proportions to select the proper formulation. Lab tests are conducted to ensure a slurry mixture that performs well during placement and under traffic. For Chip Seals, there are procedures for determining the proper quantity of asphalt binder and cover aggregate. Material properties of the stone and asphalt are first obtained, and then calculations and lab testing performed to determine the required quantities. Adjustments must be made to account for traffic volume, absorption of the binder into the existing pavement and cover aggregate, characteristics of the cover aggregate, etc.

This webinar will illustrate the mix design process first for Slurry Seal / Microsurfacing, and then move into the same for Chip Seals. Discussion for each treatment will include component material analysis, proportion optimization, performance testing, final formulation adjustments and recommendations.

  • Slurry Seal/ Microsurfacing mix design requirements and standard methods.
  • Chip Seal mix design requirements and standard methods
  • Highlight each performance test and its purpose
  • Discuss the importance of specified tolerances
  • Emphasize importance of proportioning according to the job mix formula in the lab and later in the field
  • Illustrate that failure to adhere to the mix design proportions will lends itself to performance issues


  • Debbie Deep, MeadWestvaco Corp (Slurry Seal & Microsurfacing)
  • Larry Tomkins, Ergon Asphalt & Emulsions, Inc (Chip Seals)

Professional Development Hours

  • 1.5 hrs., 1.5 PDHs
  • Earned PDHs and certifications can be downloaded at your convenience when logged into the Asphalt Institute Learning Portal. Using the menu icon in the upper left corner, go to the “My Activities” menu option: select either the “Courses” or “Learning Plans” option from the menu on the page. To the right of each course or learning plan you have completed will be an award icon. Clicking that icon will allow you to download the desired certificate.


  • Registration is per individual. Only the registered person will receive emails about the webinar and will be recognized for a PDH certificate. See below for group registration.

Group Registration & PDH Certificate Policy

For more information contact