Despite the fact that premix carpet is the most effective form of surface course for highway maintenance. When these conditions exist, the bituminous surface treatment of roads are utilized:
- The level of activity is not very intense.
- Because of the lengthy journey or the many technical reasons, the pro-mix mixers are not widely accessible.
- when there is a huge financial expense.
One or more of the following surface treatments can be utilized:
- Single Surface Treatment:
This type of wearing course applies the bituminous treatment material for roads in a spray and then places the aggregate evenly on top of the bitumen mineral. The thickness of such a layer should roughly correspond to the nominal size of the aggregate that is being employed.
- Multiple Surface Treatment: (Double or Triple):
Multiple Surface Treatment: (Double or Triple) is a wearing surface in which a coarse aggregate is placed on top of a bitumen coat (prime coat) that has already been applied, followed by spraying of bitumen, and then by subsequent application of finer aggregate over a second bitumen coat. Single Surface Treatment is a wearing surface in which a coarse aggregate is placed on top of a bitumen coat (prim In general, the maximum thickness of a single layer corresponds generally to the maximum size of aggregate, and the lowest size of the smallest aggregate is one of the aggregates that was used in the application that came before it.
Functions of a Bituminous Surface treatment of roads:
The functions of surface treatment include providing a surface that is both long-lasting and inexpensive for granular base roads that have light to medium volumes of traffic. For the purpose of preventing surface water from seeping into older pavement that has aged or broken.
When applied to areas of a bitumen surface that have become polished as a result of traffic, it makes the surface less slippery. To offer a temporary cover in the event that the pavement is completed but delayed.
In the field of highway maintenance, the following are prerequisites for effective surface treatment:
- The base course has been thoroughly prepared to its profile and has had any ruts or potholes filled in as much as possible.
- The quality of the bituminous surface treatment dressing is reliant on the utilization of the appropriate amount of binder aggregate.
- Before applying that initial surface treatment application, you should make sure the foundation is clean and clear of any dust, loose soil, and other debris.
- It is essential for any construction project involving bituminous materials that the newly surfaced area has a bond with the already present foundation at the interface. Additionally, it is essential that the base be extremely impermeable to water.
Advantages of using bituminous material as the road surface treatment
- A Layer that stops water from getting through to the pavement below.
- Increased resistance to slipping.
- A filler may be applied to surfaces that already have cracks or ravels.
- A coating designed to increase light reflection while decreasing glare in damp circumstances, ideal for use while driving at night.