쇼핑몰 , 호텔주차장, 중소형 공장 주차장 도로포장 > 현장갤러리

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1. Compacted Subgrade (150 – 300mm): 

The compacted subgrade is a base of all pavement layers. All the above pavement layers transfer the stress to this layer. So, it is essential to ensure that soil sub-grade is not overstressed. Therefore, it should be properly compacted to the desired density, near the optimum moisture content. 

2. Sub-base Course (100 – 300 mm): 

It is a layer of material below the base course. It is a major role to provide structural support, improve drainage, and reduce the intrusion of fines from the sub-grade in the pavement structure. In the case of the base, the course is open graded then the sub-base course with more fine material can be utilized as filler between sub-grade and the base course. 

3. Base Course (100 – 300 mm): 

It is a layer of materials just below the surface of the binder course and it provides additional load distribution and contributes to the sub-surface drainage. The different materials are used for base courses such as crushed stone, crushed slag, and other untreated or stabilized materials. 

4. Prime Coat: 

A prime coat is applied by spreading low viscous cutback bitumen to an absorbent surface like granular bases on which binder layer is placed. It is primly used to provide a bond between two layers.  A prime coat is able to penetrate into below layers, plugs the voids, and forms a watertight surface. 

5. Binder Coat (50 -100 mm): 

Binder coat has the bulk of the asphalt concrete structure. Its main function is to distribute the load to the base course. The binder course primly consists of aggregate mixed with low asphalt and doesn’t require quality as high as the surface course. Replacement of some part of the surface course by the binder course results in a more economical design. 

6. Tack Coat: 

In tack coat, a little amount of asphalt is applied to the surface. It is generally asphalt emulsion diluted with water. Its main function is to provide proper bonding between two layers of binder course and must be thin, uniformly cover the entire surface, and set very fast. 

7. Surface Course (25 – 50 mm): 

It is the main layer that bears the direct traffic load and generally contains superior quality materials. The surface course is generally constructed with graded asphalt concrete (AC). The functions and requirements of this layer are: 

• This course offers major characteristics like friction, smoothness, drainage, etc. Also, it prevents the entry of excess water into the underlying base, sub-base, and sub-grade, 
• It should be provided with a hard surface to resist the distortion under traffic and provide a smooth and skid-resistant riding surface, 

8. Seal Coat: 

The seal coat is a thin layer with water-proof the surface and to provide skid resistance