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Reinforced Concrete Vertical Impedance Scanning

Reinforced Concrete Vertical Impedance Scanning is a new technology that measures how easily current flows
from the surface of a bridge deck to the underlying rebar. This measurement is highly correlated to a bridges
susceptibility to chloride ingress which is one of the leading causes of bridge deck deterioration.

This technology is expected to make a significant impact in the field of non-destructive bridge inspection.
It is one of the only non-destructive testing technologies that is effective on asphalt overlaid bridges.
Also due to the high sample rates possible using this technique allows for over 100X faster scanning speeds
of more traditional scanning techniques such as chaining.

Currently our impedance apparatus consists of 4 probes mounted to a trailer that can travel up to 5 mph.
This trailer is currently equipped with localization hardware that allows us to map each impedance
measurement to a spatial location on a bridge, allowing us to create entire maps of a bridge in minutes.

Future work includes creating standard thresholds to help interpret impedance data exploring multi-frequency
excitation of concrete, and looking into what useful information can be learned from the phase information of this type of testing.


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