12/25/2023 0 Comments Asphalt emulsion technology![]() ![]() We should think in terms of “staged preservation,” much like we talk about “staged construction” to add new pavement layers as traffic increases. Engineers could then optimize the selection and timing of preservation applications to best counter the damage. FHWA created the Emulsion Task Force to oversee a comprehensive effort to bring emulsion specifications into the Superpave era.Ī second key need is to identify material properties near the pavement surface that predict imminent damage. The first is performance-graded emulsion specifications. FHWA’s Pavement Preservation Roadmap identifies two critical research needs. ![]() KING: It is hard to separate emulsion issues from the broader need to expand the use of pavement preservation technologies. We, as an industry, have to step up the efforts to keep everyone involved familiar with the latest technological advancements as well as the fundamentals of emulsion usage. This puts an enormous amount of importance on education. We are seeing an increased rate of turnover in agency personnel nationwide. ISHEE: Regional consistency of emulsion specifications, nomenclature and agency certification would help mitigate some of the challenges the industry faces. Asphalt emulsion requirements must include a mechanism for acquiring the emulsion residue such that the residue is representative of the binder on the road. The new specification needs to address testing at temperatures normally seen by surface treatment applications, chip retention, fatigue at room temperature, ability to penetrate cracks of varied widths, and adhesion at high and low temperatures, and include climate and traffic in the binder selection process. A specification that incorporates a standard grading system will serve to more uniformly describe asphalts and base asphalt for asphalt emulsions. Most emulsion specifications continue to use viscosity-graded asphalt binders or penetration-based specifications. Today’s technology has brought more manufacturing choices and capability to agencies such that a “performance based” specification is desired. The next few pages contain what our panelists said.ĪSPHALT: WHAT ARE SOME OF THE ISSUES AND CHALLENGES FACING THE USE OF EMULSION?īAUGHMAN: Historically, emulsion availability has generally driven the agencies’ decisions on which emulsions to specify. King serves as a member of the ETF and as chairman of the Emulsion Residues Test subcommittee. Ishee is on AEMA’s Board of Directors, a PPETG member, and on TRB’s Committee on Pavement Preservation. Mark Ishee, Vice President, Pavement Preservation, Ergon Asphalt & Emulsions.Baughman is a former president of AEMA and serves as a member of the Pavement Preservation Expert Task Group’s (PPETG) Emulsion Task Force (ETF). Barry Baughman, Technical Director for Ultrapave Corporation.In this article, we asked a group of asphalt industry professionals to share their thoughts on what is ahead for emulsions. These articles are available online in the archives of our magazine. The first article provided basic, overview information and the second one looked at some high performance applications. This is the third article in our series on asphalt emulsions. ![]()
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