Section 3: Bridge Joints
Risks of Chemical Damage
Joints are positions in the deck which allow thermal contraction
and expansion to occur. If joints are not maintained then runoff
will fall through joints. Typically, snow melt runoff is concentrated on
the low side of the structure. Snow melt is particularly brutal
because it is laced with chemical agents concentrated in one area
and flows for extended periods of time (length of meltdown). This combination
of concentrated flow combined with corrosive agents subjected to
extended exposure allows for corrosion damage to initiate and progress.
Bridge Joint Inspection and Cleaning
TxDOT prefers bridge joint inspection and cleaning to be performed in the spring and re-inspection to occur prior to the beginning of snow season. This fulfills the annual bridge inspection criteria in accordance with the
Figure 5-3. Poorly maintained joint allowed concentrated de-icer solution to damage cap.
Figure 5-4. Poorly maintained joint allowed de-icer solution to damage overhang to second mat of steel and top plate steel on beam.