Based on the objectives above and the overall goal of this research, the following tasks are proposed:
(a) Conduct detailed review of, but not limited to, existing research, literature, case studies, airport regulations and best practices related to lateral shear damage on pavement structures. As a minimum, the review should focus on:
a. Understanding damages induced by excessive lateral forces.
b. Examples of failures and corrective measures adopted by the industry.
c. Pavement mechanics and the structural behavior as it relates to shear stresses.
d. Pavement design procedures and how they can be modified to include shear stress resistance.
e. Mapping the interaction load-pavement response to understand and define loading threshold in which the problem must be investigated during the design.
(b) Load characterization
a. Types of landing gear and loading magnitudes.
b. Gear speed and loading duration.
c. Operational characteristics and limiting conditions.
(c) Pavement mechanics
a. Investigation of best constitutive models and type of pavement simulations required to effectively evaluate the high shear stress problem. (Note: not a model development, but rather a model search from the ones commonly used in practice.)
(d) Aircraft-Pavement interaction
a. Investigate the interaction between various aircrafts and gear/loading configurations and the pavement structure.
b. Identify critical conditions and limiting cases in which the evaluation of high lateral shear stress is required.
c. Investigate pavement structure concepts to minimize lateral shear damage.
(e) Pavement design recommendation
a. Evaluate pavement design methods, including FAA, to propose ways to incorporate a procedure to evaluate high lateral shear stress damage and failure.
(f) Materials and construction practices
a. Recommendations of asphalt concrete mixture requirements to produce shear resistant materials (including lab tests of such materials).
b. Construction good practices to avoid creating areas more susceptible to damage induced by shear forces.
(g) Prepare guidebook to assist airport pavement engineers in dealing with the design, construction and maintenance of pavement structures subjected to high levels of surface or subsurface lateral forces.