1.0 Introduction
Prime Coat
Prime coat would act as a protective measure for the Aggregate Base, prior to laying surface courses. It enhances the bond between two layers.
Tack Coat
Tack Coat would be applied over existing pavement so that to provide bond between two layers.
2.0 Abbreviations
CM – Construction Manager
SE – Site Engineer
SEO – Safety & Environmental Officer
ME – Material Engineer
QAE – Quality Assurance Engineer
QAS – Quality Assurance System
PPE – Personal Protective Equipment
3.0 Resources
| 3.1 Man Power | 3.2 Equipments & Tools |
| CM | Water Bowser |
| SE | Brooms/ Brushes |
| ME | Air Compressor |
| SEO | Distributor |
| QAE | Level Instruments |
| Lab Technicians & Helpers | Safety Inventory |
| Surveyor | Blinkers |
| Survey Helpers | Barrels |
| Supervisor/Foreman | Signal torches |
| Operator (Water Bowser) | Traffic Jackets with Retro reflective patches/stripes |
| Operator (Sprayer Bowser) | Sufficient barricade tapes. |
| Operator (Broomer) | Barricade boards with Retro reflective stripes |
| Operator (Air Compressor) | Stop and Go signs |
| Skilled & Unskilled laborers | Road works ahead boards |
| Traffic cones | |
| End sign ( road works end) |
3.3 Material
Prime Coat
1. The prime coat shall consist of medium curing cutback bitumen (25 – 45 percent) or MC30.
2. The Blotting material shall be crushed rock or river sand having grading limit of specified in contract specification.
Tack Coat
3. The Tack coat shall consist of medium curing cutback bitumen (10- 20 present) or CRS 1h.
4.0 Methodology
4.1 Prime Coat
4.1.1 General
1. The prime coat would be applied over the prepared approved aggregate base cause which laid in accordance to the designed cross sections levels, given by the surveyor.
2. Dense graded aggregate base should be done on a prepared and accepted sub-base course or other roadbed in accordance with the specification and specific requirements of the contract in conformity with the required lines, levels, grades, dimensions and cross sections.
3. Quality of the work would be secured through the careful control of the materials as same as the workmanship.
4. Adequate safety control measures would be provided to prevent from any damage or danger to the public and the personnel involved in the work.
4.1.2 Preparation of Surface
1. Prior to application of prime coat the base would be brushed to remove all dust, loose particles and other extraneous material and the surface would be moistened with water just before priming.
2. Where local irregularities in the existing surface, the surface would be brought to uniform contour by patching with fine particles of aggregate base course or an asphalt mixture to be approved by the Engineer.
3. Where the mix is laid over cement concrete pavements, joints and cracks would be cleaned and filled with bituminous material as approved, and any unevenness of the surface would be corrected as required. A tack coat would then be applied to the surface.