How long should allow the prime coat to fully cure?

Following application of the prime material and prior to application of the succeeding layer of asphalt mixture, allow the prime coat to cure and water or volatiles to evaporate prior to overlaying. This may take 24 hours for emulsion primes and 72 hours for cutback primes depending on site and weather conditions.

1. How long does prime coat take to cure?
2. How long should the prime coat penetrate and dry hours before placing asphaltic material on the primed surface?
3. How do you apply prime coat?
4. How do you test prime coat?
5. Why is prime coat applied?
6. When should tack coat be applied?
7. What is MC 70 asphalt?
8. Why are prime coats and tack coats used?
9. What is seal coat tack coat and prime coat?
10. What is bituminous prime coat?
11. Which is more viscous prime coat or tack coat?
12. What is the minimum thickness of seal coat?
13. What is a prime coat?
14. What is the density of prime coat?
15. What is mc1 bitumen?

How long does prime coat take to cure?

The prime coat shall be permitted to cure until the penetration has been approved by the Engineer, but at no time shall the curing period be less than 24 hours for MC-30 or four hours for PEP.

How long should the prime coat penetrate and dry hours before placing asphaltic material on the primed surface?

Prime coat should not be applied to a subgrade when it is wet. Highly cemented soils which harden as they dry out may soften if prime coat is applied. "Cutback asphalts using prime coats have the further disadvantage of releasing hydrocarbons into the air, asphalt prime coat require a curing period, usually 24 hours."

How do you apply prime coat?

Coat and bond loose material particles on the surface of the base. Harden or toughen the base surface to provide a work platform for construction equipment. Plug capillary voids in the base course surface to prevent migration of moisture. Provide adhesion between the base course and succeeding asphalt course.

How do you test prime coat?

Specific Gravity of Prime Coat= 0.95. Calculate increase in Weight= (B-A) kg. Rate of Spray in Kg = (Increase in Weight)/(Area of tray) Unit of Rate of Spray in kg/sqm.

Why is prime coat applied?

The prime coat is basically designed to harden or toughen the base surface, to provide adhesion between the base and the asphaltic courses, to coat and bond loose aggregate particles, and to waterproof the surface of the base.

When should tack coat be applied?

When an asphalt emulsion is used, it should normally be applied at a temperature between 120^oF and 160^oF. When an asphalt binder is used, it should normally be applied at a temperature between 275^oF and 325^oF.

What is MC 70 asphalt?

MC-70 is a liquid petroleum product produced by fluxing penetration grade bitumen with suitable petroleum diluents. It is a medium curing cutback asphalt consisting of penetration grade asphalt cement and diluent or cutter of medium volatility.

Why are prime coats and tack coats used?

Tack and prime coats help protect pavement from water damage and can prevent slipping on slick asphalt surfaces. A tack coat, or bond coat, is a thin layer of asphalt emulsion applied specifically between hot mix asphalt (HMA) pavement lifts to help with the bonding process.

What is seal coat tack coat and prime coat?

Seal Coat Seal coat is a thin surface treatment used to water-proof the surface and to provide skid resistance. Tack coat: ... The bituminous prime coat is the first application of low viscosity liquid bituminous material over an existing porous or absorbent pavement surface like the WBM base course.

What is bituminous prime coat?

Bitumen Prime Coating is a solution containing high quality oil bitumen and specially selected organic solvents with softening temperature at no lower than 70°C. Primers are ready to use products for single coat applications suitable for all types of substrates.

Which is more viscous prime coat or tack coat?

A tack coat is applied after the prime coat, to form an adhesive bond between the tack coat and the next layer of coating. ... It is vital that the prime coat is clean and dry before installing a tack coat. The higher the viscosity of the tack layer, the more shear strength the overall structure will have.

What is the minimum thickness of seal coat?

Explanation: The minimum thickness of the seal coat required is 20mm for bitumen pavement, seal coat is a layer above the flexible pavement surface. Explanation: The aggregate impact value should not be more than 30% for aggregate used in bitumen if it is less than 30 the aggregate may be replaced.

What is a prime coat?

A prime coat is the application of a suitable bituminous binder applied to a non-bituminous granular base as a preliminary treatment before the application of a bituminous surfacing. The purpose of this research is to establish practical applications of successful prime coats to replace cutback asphalt.

What is the density of prime coat?

The Prime coat shall be applied uniformly to the surface of the base using a pressure distributor at a rate between 0.65 and 1.75 kg per square meter (For Oman, Standard Specification for Road and Bridge Construction 2010 application rate is 0.8 - 1.75 kg per square meter ) and at a temperature between 50℃ to 80℃ for ...

What is mc1 bitumen?

SABIT MC-1 is a cold applied product formulated from the best ductile bitumen and blended in petroleum solvents. It is easy to apply and it doesn't need thinning or heating. Uses and Application.