NHI SAFETY INSPECTION OF IN-
SERVICE BRIDGES FINAL EXAM
QUESTIONS & VERIFIED CORRECT
ANSWERS PASSED 100%
Clacking - Correct Answer ✔✔ the sound of delaminated concrete
Pinging - Correct Answer ✔✔ the sound of "sound" concrete
Where are shear key joints? - Correct Answer ✔✔ between pre-cast deck panels
Where can you find anchorage zones? - Correct Answer ✔✔ precast deck tie rods
flexure cracks are primarily what direction compared to the primary reinforcement? -
Correct Answer ✔✔ perpendicular
Main inspection area for FRP bridges? - Correct Answer ✔✔ Joints
Assembly joint without seal- sliding plate - Correct Answer ✔✔ two steel plates sliding
on top of one another with maximum movement of 4 inches
Compression joint seal - Correct Answer ✔✔ rectangle of neoprene with a honeycomb
cross section. Can handle movement of 2 inches
pourable joint seal - Correct 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 - Correct 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 - Correct 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 - Correct Answer ✔✔ steel reinforced neoprene that
supports vehicular loads over the joint and allow for movement up to 4 inches
, Assembly joint with seal- sheet - Correct 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 - Correct 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 - Correct 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 - Correct Answer ✔✔ move water away from specific locations (to
protect the bridge)
grade and cross slope - Correct Answer ✔✔ directs the runoff to the inlets and helps
eliminate or reduce ponding
inlets - Correct Answer ✔✔ receives water
outlet pipes - Correct Answer ✔✔ leads water away from the drain
downspout pipes - Correct Answer ✔✔ directs deck drainage from outlet pipe
cleanout plugs - Correct Answer ✔✔ removable plug in piping system that allows
access for cleaning downspout pipes
drainage troughs - Correct Answer ✔✔ located under open joints to divert runoff away
from components
scupper - Correct Answer ✔✔ inlet on a bridge that receives water, with grate or
perforated cover to keep out large debris
Deck Drains - Correct Answer ✔✔ open holes or embedded tubes similar to scuppers
downspout - Correct Answer ✔✔ directs drainage to nearby storm drain
weep holes - Correct Answer ✔✔ small drainage holes found in abutment stems and
retaining walls which allow water to drain from behind abutment
underdrains - Correct Answer ✔✔ perforated pipes routed along back face of the
abutment and channeled to a nearby waterway or storm water drainage system
aerial obstruction lighting - Correct Answer ✔✔ used to alert aircraft that a hazard exists
below
SERVICE BRIDGES FINAL EXAM
QUESTIONS & VERIFIED CORRECT
ANSWERS PASSED 100%
Clacking - Correct Answer ✔✔ the sound of delaminated concrete
Pinging - Correct Answer ✔✔ the sound of "sound" concrete
Where are shear key joints? - Correct Answer ✔✔ between pre-cast deck panels
Where can you find anchorage zones? - Correct Answer ✔✔ precast deck tie rods
flexure cracks are primarily what direction compared to the primary reinforcement? -
Correct Answer ✔✔ perpendicular
Main inspection area for FRP bridges? - Correct Answer ✔✔ Joints
Assembly joint without seal- sliding plate - Correct Answer ✔✔ two steel plates sliding
on top of one another with maximum movement of 4 inches
Compression joint seal - Correct Answer ✔✔ rectangle of neoprene with a honeycomb
cross section. Can handle movement of 2 inches
pourable joint seal - Correct 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 - Correct 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 - Correct 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 - Correct Answer ✔✔ steel reinforced neoprene that
supports vehicular loads over the joint and allow for movement up to 4 inches
, Assembly joint with seal- sheet - Correct 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 - Correct 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 - Correct 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 - Correct Answer ✔✔ move water away from specific locations (to
protect the bridge)
grade and cross slope - Correct Answer ✔✔ directs the runoff to the inlets and helps
eliminate or reduce ponding
inlets - Correct Answer ✔✔ receives water
outlet pipes - Correct Answer ✔✔ leads water away from the drain
downspout pipes - Correct Answer ✔✔ directs deck drainage from outlet pipe
cleanout plugs - Correct Answer ✔✔ removable plug in piping system that allows
access for cleaning downspout pipes
drainage troughs - Correct Answer ✔✔ located under open joints to divert runoff away
from components
scupper - Correct Answer ✔✔ inlet on a bridge that receives water, with grate or
perforated cover to keep out large debris
Deck Drains - Correct Answer ✔✔ open holes or embedded tubes similar to scuppers
downspout - Correct Answer ✔✔ directs drainage to nearby storm drain
weep holes - Correct Answer ✔✔ small drainage holes found in abutment stems and
retaining walls which allow water to drain from behind abutment
underdrains - Correct Answer ✔✔ perforated pipes routed along back face of the
abutment and channeled to a nearby waterway or storm water drainage system
aerial obstruction lighting - Correct Answer ✔✔ used to alert aircraft that a hazard exists
below
