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Tack Coat Best Practices
- Store emulsion in vertical tanks. for long-term storage.
- Store at a temperature between 50°F and 180°F (10°C and 83°C).
- Don’t let the emulsion freeze.
- Don’t allow emulsion temperatures to exceed 212°F (100°C) or water boiling point.
- Don’t allow emulsion to free-fall into vessel from loading line or recirculation line.
- Do bottom load.
- Circulate material every two weeks.
- Protect pump, valves and lines from freezing.
- Don’t mix anionic and cationic emulsions.
- Don’t load elevated temperature material above 212°F (100°C) on top of asphalt emulsion.
- Circulate vessel while heating with direct fire tubes. (Low fire on heating tubes).
- Dilute emulsion by adding warm water to the emulsion.
- Check with the emulsion manufacturer for guidance on dilution of emulsion.
- Wear proper personal protective equipment (PPE) to safely handle the emulsion.
- Asphalt emulsions are nonhazardous materials.
- Asphalt emulsions do not require placards.
NAPA's Emulsion Bond Coat Best Practices Checklist
- Clean the pavement
- Maintain emulsion at proper temperature
- Determine residual asphalt content required
- Calculate application rate
- Set spray-bar height for triple overlap of spray
- Ensure nozzles are correct size
- Ensure all nozzles are same size
- Set spray nozzles at same angle
- Ensure all nozzles are clean and functioning properly
- Ensure distributor is calibrated
- Ensure uniform application of tack coat
- Prevent tracking and pickup of the emulsion
Other Best Practices References:
- Tack Coat Best Practices, NAPA QIP-128 (2013)
- Tack Coats: How and what to apply! Colorado Asphalt Pavement Association (CAPA)(2011)
- Tack Coat Guidelines, Caltrans (2009)
- Hot Mix Asphalt Paving, US Army Corp of Engineers (2000)
- FHWA Technical Bulletin on Tack Coat Best Practices (2016)
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