NHI Safety Inspection of In-Service
Bridges FINAL EXAM Questions and
All Correct Answers.
Clacking - Answer the sound of delaminated concrete
Pinging - Answer the sound of "sound" concrete
Where are shear key joints? - Answer between pre-cast deck panels
Where can you find anchorage zones? - Answer precast deck tie rods
flexure cracks are primarily what direction compared to the primary reinforcement? - Answer
perpendicular
Main inspection area for FRP bridges? - Answer Joints
Assembly joint without seal- sliding plate - Answer two steel plates sliding on top of one
another with maximum movement of 4 inches
Compression joint seal - Answer rectangle of neoprene with a honeycomb cross section. Can
handle movement of 2 inches
pourable joint seal - Answer made of three materials (backing material, joint filler, and a
poured joint sealant) and can only accommodate movement of 1/4 inch. Used on short spans
strip seal expansion joint - Answer two slotted steel anchorages cast into a deck or back wall.
A neoprene seal fits into the grooves to span the joint. max movement of 4 inches
Cellular joint seal - Answer different than compression because of material used to close
joint. Made up of closed-cell foam that allows the joint to move in different directions. Allows
for both parallel and perpendicular joint movement
Assembly joint with seal- plank - Answer steel reinforced neoprene that supports vehicular
loads over the joint and allow for movement up to 4 inches
, Assembly joint with seal- sheet - Answer two blocks of steel reinforced neoprene. thin sheet
of neoprene spans the joint and connects the two blocks. Allows for up to 4 inches
open expansion joint - Answer gap between the bridge deck and the back wall of the
abutment or adjacent deck section. usually found on short span bridges, usually unprotected
Assembly joint without seal- finger plate - Answer tooth plate joint, two steel plates that
have interlocking fingers. usually on longer spans. can accommodate movement from 4 to 24
inches
drainage system - Answer move water away from specific locations (to protect the bridge)
grade and cross slope - Answer directs the runoff to the inlets and helps eliminate or reduce
ponding
inlets - Answer receives water
outlet pipes - Answer leads water away from the drain
downspout pipes - Answer directs deck drainage from outlet pipe
cleanout plugs - Answer removable plug in piping system that allows access for cleaning
downspout pipes
drainage troughs - Answer located under open joints to divert runoff away from components
scupper - Answer inlet on a bridge that receives water, with grate or perforated cover to
keep out large debris
Deck Drains - Answer open holes or embedded tubes similar to scuppers
downspout - Answer directs drainage to nearby storm drain
weep holes - Answer small drainage holes found in abutment stems and retaining walls
which allow water to drain from behind abutment
underdrains - Answer perforated pipes routed along back face of the abutment and
channeled to a nearby waterway or storm water drainage system
Bridges FINAL EXAM Questions and
All Correct Answers.
Clacking - Answer the sound of delaminated concrete
Pinging - Answer the sound of "sound" concrete
Where are shear key joints? - Answer between pre-cast deck panels
Where can you find anchorage zones? - Answer precast deck tie rods
flexure cracks are primarily what direction compared to the primary reinforcement? - Answer
perpendicular
Main inspection area for FRP bridges? - Answer Joints
Assembly joint without seal- sliding plate - Answer two steel plates sliding on top of one
another with maximum movement of 4 inches
Compression joint seal - Answer rectangle of neoprene with a honeycomb cross section. Can
handle movement of 2 inches
pourable joint seal - Answer made of three materials (backing material, joint filler, and a
poured joint sealant) and can only accommodate movement of 1/4 inch. Used on short spans
strip seal expansion joint - Answer two slotted steel anchorages cast into a deck or back wall.
A neoprene seal fits into the grooves to span the joint. max movement of 4 inches
Cellular joint seal - Answer different than compression because of material used to close
joint. Made up of closed-cell foam that allows the joint to move in different directions. Allows
for both parallel and perpendicular joint movement
Assembly joint with seal- plank - Answer steel reinforced neoprene that supports vehicular
loads over the joint and allow for movement up to 4 inches
, Assembly joint with seal- sheet - Answer two blocks of steel reinforced neoprene. thin sheet
of neoprene spans the joint and connects the two blocks. Allows for up to 4 inches
open expansion joint - Answer gap between the bridge deck and the back wall of the
abutment or adjacent deck section. usually found on short span bridges, usually unprotected
Assembly joint without seal- finger plate - Answer tooth plate joint, two steel plates that
have interlocking fingers. usually on longer spans. can accommodate movement from 4 to 24
inches
drainage system - Answer move water away from specific locations (to protect the bridge)
grade and cross slope - Answer directs the runoff to the inlets and helps eliminate or reduce
ponding
inlets - Answer receives water
outlet pipes - Answer leads water away from the drain
downspout pipes - Answer directs deck drainage from outlet pipe
cleanout plugs - Answer removable plug in piping system that allows access for cleaning
downspout pipes
drainage troughs - Answer located under open joints to divert runoff away from components
scupper - Answer inlet on a bridge that receives water, with grate or perforated cover to
keep out large debris
Deck Drains - Answer open holes or embedded tubes similar to scuppers
downspout - Answer directs drainage to nearby storm drain
weep holes - Answer small drainage holes found in abutment stems and retaining walls
which allow water to drain from behind abutment
underdrains - Answer perforated pipes routed along back face of the abutment and
channeled to a nearby waterway or storm water drainage system
