Pavement Design
The pavement design unit is responsible for the
design of
typical pavement sections and pavement restoration sections for the statewide
DOTD system and is required to incorporate the latest technological advances
and materials into the design process. These designs include pavement overlays
(for the Pavement Restoration Program) of the statewide DOTD highway and
airport systems, including interstate rehabilitation, statewide highway system,
urban systems, and airport systems. These designs require specialized modeling,
a complete understanding of FHWA and AASHTO design criteria, and advanced
training utilizing specialized software packages. This unit also provides Life
Cycle Cost Analysis (LCCA) evaluations for alternative pavement designs and
ensures all contract information is readily supplied to the Contracts and
Specifications Section prior to bidding alternative pavement design projects. In
order to perform the pavement design, shallow soil subgrade data is required to
be analyzes. This requires close coordination with laboratory personnel. Furthermore, the need for additional
subsurface investigation requirements regarding the pavement structure design
will need to be determined. Upon
reviewing the subgrade soil properties such as Atterberg Limits, sieve
analysis, hydrometer tests, percent of organics, density, moisture content and
water table depth, the proper stabilization techniques required for roadway
subgrades including the use of lime treatment, cement treatment or modification
with geosynthetics can be determined.