Chapter 5: Flexible Pavement Design


Section 1: Overview

This chapter discusses the following topics:

  • types of flexible pavements
  • design parameters of FPS-19W (analytical flexible pavement design procedure)
  • pavement detours and widening
  • design of perpetual pavements.

The preferred analytical method of flexible pavement design, FPS-19W, uses a systems approach.

The design system is centered upon deflection measurements from the Falling Weight Deflectometer ( FWD). These measurements are then used by the MODULUS computer program to determine the material properties of the pavement layers. The material properties of the pavement layers are then used to compute alternative structural designs using FPS-19W.

Designs derived by the FPS design process are always checked for sheer strength adequacy using the Modified Texas Triaxial Class (TTC) design method. There are currently two alternative analytical design procedures allowed by the department for flexible design:

  • FPS-11 and
  • AASHTO (1993).

These pavement design procedures were briefly described in Chapter 2 and will not be further addressed here.

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