Road American
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How are different types of bitumen emulsion selected based on aggregate chemistry and construction method?
Selection starts with aggregate surface characteristics and the planned method: tack coat, surface dressing, slurry, cold mix, or waterproofing. Cationic emulsions are often chosen for many siliceous aggregates due to charge attraction, while anionic may work well with other aggregate chemistries depending on local practice. Construction method determines break speed requirements and viscosity targets. Compatibility is validated using coating, breaking, and adhesion tests with the actual aggregate source. The best choice is the emulsion that delivers predictable break timing, coating quality, and bond strength under the site’s temperature and moisture conditions.
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