The primary response model programmed in the VESY II-M pavement design and analysis structural subsystem provides for the solution of a three-layered viscoelastic pavement system only. This report modifies this primary response model by extending the solution for stresses, strains, and deflections, to an N-Layered viscoelastic system for any value of Poisson's ratio. An approximate probabilistic solution for the N-Layered viscoelastic system is also presented in closed form. A rut-depth prediction model which uses simplified laboratory characterization tests is developed. The resulting pavement design and analysis models are structured into a set of modular subsystems which provide for easy replacement and incorporation of improved components in any one of the subsystems. An initial concept to optimize the procedure for the design of flexible pavement systems is also presented.

The application of absolute reaction rate theory concepts is explored as a scientific basis for establishing an accelerated testing methodology for adhesive bonded joints. Primary attention is given to the effects of time, moisture, temperature and load history. Some of the more dominant processes occurring during cure and aging of epoxy resin adhesives are identified and potential techniques for separating and monitoring the associated activation energies of these mechanisms with aging, environment and load history are discussed. Suggestions are also made for incorporating aging effects into appropriately rigorous constitutive models.