1.1 Introduction
Developing a rehabilitation design generally requires extensive
investigation into the condition of the existing pavement structure,
performance history, and laboratory testing of materials to establish
suitability of existing and proposed materials for use in the rehabilitation
design. The field investigation will require a deflection survey,
drainage survey, and perhaps additional non-destructive testing
(NDT) surveys, such as ground penetrating radar (GPR), dynamic cone
penetrometer (DCP), and seismic tools. Examination of multi-year
Pavement Management Information System (PMIS) distress and ride
data will show performance-related issues. Once these preliminary
surveys are conducted, locations for material sampling can be established.
In addition, for projects where full-depth reclamation is being
considered, samples of the structure should be taken at intervals
not to exceed 0.5 mi. These samples will be evaluated in the lab
to verify field survey conclusions and establish basic properties
necessary to quantify moisture susceptibility, stabilizer compatibility,
blending requirements, etc.
The preferred rehabilitation strategy should consider:
- cost-effectiveness,
- repair of the specific problems of the existing pavement,
- prevention of future problems, and
- meeting all existing constraints of the project.