The pavement response model in M-E PDG employs which method to calculate stress and strain parameters?

• A. Mechanistic
• B. Empirical
• C. Both A and B
• D. None of the above

Answer: (A)

The correct answer is that the pavement response model in M-E PDG employs the mechanistic method to calculate stress and strain parameters. The mechanistic approach is based on the principles of mechanics and materials. It uses mathematical models to represent the physical behavior of pavement materials under load. This involves analyzing how loads affect pavement structure and how stress and strain distribute through the layers under different conditions (e.g., temperature, moisture content).

In the context of the M-E PDG (Mechanistic-Empirical Pavement Design Guide), this mechanistic model allows engineers to simulate the response of pavement to various traffic loads and environmental conditions over time. By employing the mechanistic approach, designers can assess pavement performance more accurately and predict failures such as cracking or rutting.

The other methods, specifically empirical, rely on observed data and statistical relationships derived from past performance to guide pavement design. While empirical methods are useful, they do not delve into the fundamental mechanics of pavement behavior, which is critical for a detailed understanding of stress and strain responses under various loading conditions.