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Manual for Emulsion-Based Chip Seals for Pavement Preservation (2011) / Chapter Skim
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Pages 22-25

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From page 22...
... The distributor operator should spray emulsion onto the pavement surface for as short an interval as possible while an observer watches where the emulsion hits the pavement from each nozzle left open. Emulsion overlaps indicate that the bar is too high, and a gap indicates that the bar is too low.
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From page 23...
... The surface of these areas should be sprayed with a light application of slow-setting asphalt emulsion diluted 50:50 with water at the rate of 0.10 gallons per square yard and allowed to cure thoroughly before chip sealing so that the new chip-seal binder will not be absorbed into the surface of the new patch. Failure to do this could lead to loss of chips under traffic.
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From page 24...
... In many cases, changes in environmental conditions during construction will require this test be repeated during the day because humidity, chip moisture, emulsion properties, and ambient air temperature affect the adhesive quality of the emulsion. 7.2.5 Rolling Different types of rollers have been used to embed chips on chip seals.
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From page 25...
... This should be possible when the moisture content of the chip seal reaches the level where 10% chip loss occurs after the laboratory sweep test. This moisture content, measured by the moisture loss test, was found to be approximately 15% to 25% of the total moisture present in the chip seal and indicated that total moisture consists of water in the emulsion plus moisture in the aggregate chips, but not moisture in the pavement (see attachment)
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Key Terms

  • chip seal
  • asphalt emulsion
  • sweep test
  • moisture content
  • chip seals

  • test method
  • emulsion residue
  • moisture loss
  • aggregate chips
  • pavement surface

  • chip spreader
  • emulsified asphalt
  • chip moisture
  • chip application


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