The study concentrates on a more objective condition assessment of bridge decks using a complementary
use of nondestructive evaluation (NDE) techniques. The condition assessment has three main
components: assessment of corrosive environment and corrosion processes, concrete degradation assessment,
and assessment with respect to deck delamination. The NDE technologies used in the assessment include:
half-cell potential (H-C), electrical resistivity (ER), ultrasonic surface waves (USW) ground penetrating radar
(GPR), and impact echo (IE) method. Different condition rating schemes, guided by different objectives of
their usage, are presented. Those include: 1) condition rating comparisons of bridges on the network level for
condition monitoring and rehabilitation, and 2) segmentation and rating on the project level to identify areas
of the deck that should have higher priority in rehabilitation. The NDE of bridge decks and condition rating is
illustrated by a series of examples from bridge deck evaluation within the FHWA's Long Term Bridge Performance (LTBP) Program.