The shear strength of the final asphalt product is affected by the quality of the asphalt prime coat applied.
Asphalt Prime Coat is also termed as emulsified asphalt, water diluted asphalt and Cutback aliphatic spray. Recently I have got the chance of working on a highway project somewhere in a mountainous cold-weather region.
And I was amazed after finding the impact of climate on construction activities and materials used therein. The use of MC 30 cutback asphalt prime coat was a surprise factor for me but after finding its properties and features I was surprised and decided to share my experience with you.
What is Asphalt Prime Coat?
Asphalt Prime coat is actually a low viscous slow-setting grade of asphalt emulsions that are diluted with water and applied between the non-stabilized bases including but not limited to Water Bound Macadam (WBM) and succeeding asphalt course.
- Asphalt that can slow down ice formation – self de-ice roads
- What is Job Mix Formula
- 50+ Civil Engineering Materials MCQs
- Plastic Roads – an innovation in pavement and highway engineering
- Highway materials types and characteristics
Functions of Asphalt Prime Coat
Plug in the Capillary Voids
Integrity of the Granular Baser
Binder for intermediary layers
To Reduce Dust
Why Asphalt Prime Coat is needed?
Qualities of a Good Asphalt Prime Coat / Primer
Curing / Setting
Primer in Cold Weathers & Cutback Asphalt Primers
Process of Applying Asphalt Prime Coat
- Cleaning and Clearing of the Base Surface.
- Sprinkling water over the base surface to ensure good penetration of the emulsion or prime coat but avoid over watering.
- Spraying of the Prime Coat using the standard emulsion sprayer that is already properly calibrated.
- Allow penetrating and drying. Usually traffic must not be allowed for more than 24 hours but if traffic must use the road a thin layer of sand can be spread.
- Final surfacing is done on the next day.