Pavement materials – introduction (lecture 1)
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The document describes the structure and materials involved in civil engineering pavements, which facilitate transportation for pedestrians and vehicles. It outlines the different layers of pavement, including the embankment, sub-grade, sub base, base, and wearing course, and emphasizes the importance of high-quality soil and aggregates to prevent failures like rutting and cracking. Various conditions, such as weather changes and loads, affect pavement performance and require careful consideration during construction.
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Pavement materials – introduction (lecture 1)
- 2. It is a civil engineering structure that is used by the pedestrians and vehicles for commuting and transporting loads from one place to another place.
- 3. Consists of different layers Embankment Sub-grade Sub base Base Wearing course Different types of materials are used depending on the layer requirement.
- 5. Soil Sand Stone aggregates Cement Bitumen Tiles etc.,
- 6. Pavement subjected to various conditions Weather changes Impact loads Imposed loads etc.
- 7. Should not undergo excessive deformation and settlement Differential settlement – failure of pavement Hence, high compressibility and plastic properties are not desirable for pavement construction Good quality soil is required
- 8. Soil is the main constituent in Subgrade and embankment Aggregates are used in the Sub base and base layer Aggregates and binding material in the top layer
- 9. Sub grade and embankment provides support for the pavement Different types of failures such as rutting and shoving in the flexible pavements, cracking in the rigid (concrete) pavements are due to poor sub grade soil. Aggregate does have impact on the life and service of the pavement.
- 10. Soil as pavement material Importance Desirable properties Tests on Soil
- 11. Thanks .