**Lecture notes in Transportation Systems Engineering**

**3 August 2009**

- When pavements are considered as linear elastic, the elastic moduli and poisson ratio of subgrade and each component layer must be specified.
- If the elastic modulus of a material varies with the time of loading, then the resilient modulus, which is elastic modulus under repeated loads, must be selected in accordance with a load duration corresponding to the vehicle speed.
- When a material is considered non-linear elastic, the constitutive equation relating the resilient modulus to the state of the stress must be provided.

- Factor that least affect the pavement is
- Speed of vehicles
- Wheel load
- Axle configuration
- Load repetition

- Standard axle load is
- 40kN
- 60kN
- 80kN
- 10kN

- Factor that least affect the pavement is
- Speed of vehicles
- Wheel load
- Axle configuration
- Load repetition

- Standard axle load is
- 40kN
- 60kN
- 80kN
- 10kN

Prof. Tom V. Mathew 2009-08-03