NHI SAFETY INSPECTION OF IN-SERVICE
BRIDGES FINAL EXAM COMPLETE
QUESTIONS WITH VERIFIED ANSWERS
\.Clacking - ANSWERS-the sound of delaminated concrete
\.Pinging - ANSWERS-the sound of "sound" concrete
\.Where are shear key joints? - ANSWERS-between pre-cast deck panels
\.Where can you find anchorage zones? - ANSWERS-precast deck tie rods
\.flexure cracks are primarily what direction compared to the primary
reinforcement? - ANSWERS-perpendicular
\.Main inspection area for FRP bridges? - ANSWERS-Joints
\.Assembly joint without seal- sliding plate - ANSWERS-two steel plates sliding on
top of one another with maximum movement of 4 inches
\.Compression joint seal - ANSWERS-rectangle of neoprene with a honeycomb
cross section. Can handle movement of 2 inches
,\.pourable joint seal - ANSWERS-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 - ANSWERS-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 - ANSWERS-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 - ANSWERS-steel reinforced neoprene that
supports vehicular loads over the joint and allow for movement up to 4 inches
\.Assembly joint with seal- sheet - ANSWERS-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 - ANSWERS-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 - ANSWERS-tooth plate joint, two steel
plates that have interlocking fingers. usually on longer spans. can accommodate
movement from 4 to 24 inches
, \.drainage system - ANSWERS-move water away from specific locations (to protect
the bridge)
\.grade and cross slope - ANSWERS-directs the runoff to the inlets and helps
eliminate or reduce ponding
\.inlets - ANSWERS-receives water
\.outlet pipes - ANSWERS-leads water away from the drain
\.downspout pipes - ANSWERS-directs deck drainage from outlet pipe
\.cleanout plugs - ANSWERS-removable plug in piping system that allows access
for cleaning downspout pipes
\.drainage troughs - ANSWERS-located under open joints to divert runoff away
from components
\.scupper - ANSWERS-inlet on a bridge that receives water, with grate or
perforated cover to keep out large debris
\.Deck Drains - ANSWERS-open holes or embedded tubes similar to scuppers
\.downspout - ANSWERS-directs drainage to nearby storm drain
BRIDGES FINAL EXAM COMPLETE
QUESTIONS WITH VERIFIED ANSWERS
\.Clacking - ANSWERS-the sound of delaminated concrete
\.Pinging - ANSWERS-the sound of "sound" concrete
\.Where are shear key joints? - ANSWERS-between pre-cast deck panels
\.Where can you find anchorage zones? - ANSWERS-precast deck tie rods
\.flexure cracks are primarily what direction compared to the primary
reinforcement? - ANSWERS-perpendicular
\.Main inspection area for FRP bridges? - ANSWERS-Joints
\.Assembly joint without seal- sliding plate - ANSWERS-two steel plates sliding on
top of one another with maximum movement of 4 inches
\.Compression joint seal - ANSWERS-rectangle of neoprene with a honeycomb
cross section. Can handle movement of 2 inches
,\.pourable joint seal - ANSWERS-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 - ANSWERS-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 - ANSWERS-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 - ANSWERS-steel reinforced neoprene that
supports vehicular loads over the joint and allow for movement up to 4 inches
\.Assembly joint with seal- sheet - ANSWERS-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 - ANSWERS-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 - ANSWERS-tooth plate joint, two steel
plates that have interlocking fingers. usually on longer spans. can accommodate
movement from 4 to 24 inches
, \.drainage system - ANSWERS-move water away from specific locations (to protect
the bridge)
\.grade and cross slope - ANSWERS-directs the runoff to the inlets and helps
eliminate or reduce ponding
\.inlets - ANSWERS-receives water
\.outlet pipes - ANSWERS-leads water away from the drain
\.downspout pipes - ANSWERS-directs deck drainage from outlet pipe
\.cleanout plugs - ANSWERS-removable plug in piping system that allows access
for cleaning downspout pipes
\.drainage troughs - ANSWERS-located under open joints to divert runoff away
from components
\.scupper - ANSWERS-inlet on a bridge that receives water, with grate or
perforated cover to keep out large debris
\.Deck Drains - ANSWERS-open holes or embedded tubes similar to scuppers
\.downspout - ANSWERS-directs drainage to nearby storm drain
