The Advanced Pavement Preservation three-part series provides in-depth, technical training on modern preservation treatments and best practices used to extend pavement life and optimize maintenance resources.
Session 1: Mix Design Methods for Slurry Seal/Microsurfacing and Chipseals
Mix designs are an integral part of the overall performance of Slurry Seal, Microsurfacing and Chipseals. For mix design of Slurry Seals and Micros, there are several recommended sources including ASTM D3910, ISSA A-105 and 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 Chipseals, 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 Chipseals. 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
- Chipseal 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 lend itself to performance issues
Session 2: Combining Preservation Treatments
Straddled with limited budgets, agencies around the country are searching for the most cost-effective treatments to optimally address their wide array of pavement preservation and maintenance challenges. The combination of two or more traditional non-structural surface treatments to address specific types and levels of distress is increasing in popularity. An example of a combination surface treatment is a Cape Seal, which is a single-layer Chipseal followed by a Slurry Seal or a Microsurfacing. Besides following standard Chipseal and Slurry Seal best practices and specifications, there are special considerations that need to be addressed because of the combination of treatments – cure time before the slurry, aggregate sizes, application rates, etc.
This webinar will discuss the use of several different combination preservation treatments that are now being widely used: Cape Seal, Stress Absorbing Membrane Interlayer, Fog Seal over Chipseal, Surface Treatments over Crack Treatments, etc. These tailored combination treatments provide a durable final surface as well as being a very cost effective approach to improving the pavement condition. This session provides information on how to get the best possible results with these combination preservation treatments.
- Identify combination treatments
- Appropriate application of these combinations for optimal benefit
- Special considerations due to the combination of treatments
- Material selection and design
- Quality control during construction
- Expected performance
A recommended resource for this webinar recording is MS-19 Basic Asphalt Emulsion Manual.
Session 3: ISSA Inspectors Manual
In 2010 the International Slurry Surfacing Association and the National Center for Pavement Preservation joined forces to update the ISSA Inspectors Manual. This updated document serves as a valuable asset to agencies, consultants and inspectors who utilize Slurry Seals & Microsurfacing on pavements and are responsible for their inspection and acceptance. The 120-page publication covers materials, mix design, equipment calibration in the field, sampling at the site, inspection responsibilities and procedures, safety, surface preparation, stockpiling procedures, problems that may occur, their potential causes, solutions to those problems, and other suggestions. Referred to as MA-1 ISSA Inspector’s Manual, this publication can be ordered at slurry.org.
This webinar will cover the highlights of the new Inspectors Manual by guiding participants through all phases of Slurry Seal & Microsurfacing construction and inspection. Emphasis will be on illustrating the step by step procedures necessary for proper installation and oversight of projects. While not necessary to have the MA1 ISSA Inspectors Manual during this webinar to follow the presentation and benefit greatly from the information discussed, it is highly encouraged to do so either before or after the webinar in order to have a quality reference manual.
- Slurry Systems
- Materials & Design
- Construction of Treatments
- Calibration procedures
- Contract Administration
- Problem Solving
- Special Situations