Prime coat and tack coat are essential components of road construction that help in enhancing the durability and performance of roads. These two coats are applied on the surface of the road before laying the asphalt layer. In this article, we will discuss the importance of prime coat and tack coat in road construction and their benefits.
What is Prime Coat?
Prime coat is a layer of bitumen emulsion that is applied on the surface of the prepared base course before laying the asphalt layer. The main purpose of the prime coat is to protect the base course from moisture and provide a bonding surface for the subsequent layers. It also helps in improving the adhesion between the base course and the asphalt layer, thereby increasing the overall strength of the road.
Benefits of Prime Coat
The main benefits of prime coat are as follows:
- Prevents moisture from penetrating the base course
- Provides a bonding surface for the asphalt layer
- Improves the adhesion between the base course and the asphalt layer
- Increases the overall strength of the road
- Reduces the risk of premature failure of the road
What is Tack Coat?
Tack coat is a layer of bitumen emulsion that is applied on the surface of the existing asphalt layer before laying the new asphalt layer. The main purpose of the tack coat is to bond the two asphalt layers together and prevent the formation of air voids between them. It also helps in improving the overall performance and durability of the road.
Benefits of Tack Coat
The main benefits of tack coat are as follows:
- Bonds the existing and new asphalt layers together
- Prevents the formation of air voids between the asphalt layers
- Improves the overall performance and durability of the road
- Reduces the risk of premature failure of the road
Application of Prime Coat and Tack Coat
The application of prime coat and tack coat is very important in road construction. The following are the steps involved in the application of prime coat and tack coat:
- Clean the surface of the base course or existing asphalt layer
- Apply the prime coat or tack coat using a spray or distributor truck
- Allow the prime coat or tack coat to dry for a specified time before laying the asphalt layer
- Lay the asphalt layer on top of the prime coat or tack coat
Conclusion
Prime coat and tack coat are important components of road construction that help in enhancing the durability and performance of roads. The application of these coats is essential to prevent premature failure of the road and increase its overall strength. By understanding the importance of prime coat and tack coat, we can ensure the construction of high-quality and long-lasting roads.
