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The following types of construction have been used in flexible pavement:
- Conventional layered flexible pavement,
- Full - depth asphalt pavement, and
- Contained rock asphalt mat (CRAM).
Conventional flexible pavements are layered systems with high quality
expensive materials are placed in the top where stresses are high, and low
quality cheap materials are placed in lower layers.
Full - depth asphalt pavements are constructed by placing bituminous
layers directly on the soil sub-grade.
This is more suitable when there is high traffic and local materials are not
available.
Contained rock asphalt mats are constructed by placing dense/open graded
aggregate layers in between two asphalt layers.
Modified dense graded asphalt concrete is placed above the sub-grade will
significantly reduce the vertical compressive strain on soil sub-grade and
protect from surface water.
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