1.2 TYPES OF PAVEMENTS Highway pavements are of two types;
a. Flexible pavement
b. Rigid pavement
1.2.1 Flexible pavement These pavements which reflect the deformation of subgrade and the subsequent layers to the surface. Flexible, usually asphalt, is laid with no reinforcement or with a specialized fabric reinforcement that permits limited flow or repositioning of the roadbed underground changes.
The design of flexible pavement is based on load distributing characteristic of the component layers. The black top pavement including water & gravel bound macadam fall in this category.
Flexible pavement on the whole has low or negligible flexible strength flexible in their structural action. The flexible pavement layers transmit the vertical
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To be sustained by this layer, in addition to wear and tear, the lower layer have to take up only lesser magnitude of stress as there is no direct wearing action due to traffic loads, therefore inferior material with lower cast can be used in the lower layers. A typical sketch of flexible pavements is given in Figure 1.2. Figure1.2 Flexible Pavement
1.2.2 Rigid pavement The rigid characteristic of the pavement are associated with rigidity or flexural strength or slab action so the load is distributed over a wide area of subgrade soil. Rigid pavement is laid in slabs with steel reinforcement. The rigid pavements are made of cement concrete either plan, reinforced or prestressed concrete. Critical condition of stress in the rigid pavement is the maximum flexural stress occurring in the slab due to wheel load and the temperature changes. Rigid pavement is designed and analyzed by using the elastic theory.A typical sketch of rigid pavement is given in Figure 1.3. Figure1.3 Rigid Pavement.
Advantages of Rigid Pavement
Rigid pavement lasts much, much longer years compared to flexible
With this tread depth, you can use your truck on multiple surfaces without getting stuck. Also, the tread patterns offer enough stability and support for your vehicle.
Sealcoating: Sealcoating is one of the best — and most economical — ways to obtain the longest life possible for asphalt pavement.
Steeped in history and surrounded by a diverse range of natural beauty, Somerset is a popular destination for tourists. Given the importance of tourism to the local economy, city officials, homeowners and businesses rely on asphalt pavement to help make a good first impression on visitors and keep them coming back. Somerset residents know that asphalt pavement is fast to install and maintain, provides an extremely smooth ride, is long-lasting, looks great and is very cost-effective. Whether they need asphalt paving, crack repair, sealcoating, asphalt curbing, parking lot striping, asphalt milling, bumper blocks or any other asphalt-related service, they also know that they can count on APM for extraordinary results at affordable prices.
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