Construction Process of Rigid Pavement
The construction process involves several stages same as the flexible pavement construction. However, there are some other additional steps as well with the used of concrete as construction material.
The subgrade, which refers to the natural soil or existing road surface, is prepared by removing any vegetation, debris, and weak materials.
The subgrade is then compacted to ensure a stable foundation for the pavement.
Base Course Installation
A layer of granular material, known as the base course, is placed over the subgrade.
This base course provides additional support and helps to distribute the load evenly.
It also improves drainage and prevents the upward movement of water that could potentially damage the pavement.
Formwork and Reinforcement
Before pouring the concrete, formwork is installed to define the shape and dimensions of the pavement.
Steel reinforcement is also added within the concrete to enhance its strength and control cracking. The reinforcement helps distribute the load across the pavement more efficiently, reducing the risk of failure.
Space for the expansion joint will also be considered when the formwork is made. The spacing of the expansion joint would depends on the project requirements and it would be in the range of 10-20mm.
Once the formwork and reinforcement are in place, the concrete is poured and spread evenly across the designated area after the cleaning the surfaces.
The concrete mixture is carefully designed to meet the required strength and durability specifications. After pouring, the surface is leveled and finished to provide a smooth and even driving surface.
Curing and Maintenance
Curing of concrete is a mandatory process and After the concrete has been placed, it undergoes a curing process to allow it to gain strength and durability. Curing involves keeping the concrete moist and protected from extreme temperatures for a specified period. Regular maintenance, including crack sealing and joint resealing, is also essential to extend the lifespan of the rigid pavement.
Advantages of Rigid Pavement
Rigid pavement offers several advantages over other types of road construction:
Due to its robust design and ability to withstand heavy loads, rigid pavements have a longer lifespan compared to flexible pavement.
When properly constructed and maintained, rigid pavements can last for several decades, reducing the need for frequent repairs and replacement.
Rigid pavement is specifically engineered to distribute heavy loads more efficiently. It can withstand the weight of heavy vehicles without significant deformation, ensuring a smooth and safe driving experience even under heavy traffic conditions.
Compared to other pavement types, rigid pavements require relatively low maintenance.
Routine inspections, crack sealing, and joint resealing are necessary to prevent deterioration and extend the pavement’s life.
However, the maintenance requirements are generally less frequent and less costly than those of flexible pavement.