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