KDOT Highway & Bridge Inspection Procedures 3 — Questions and Answers
Question 1: What does a negative superstructure appraisal rating of N3 (N/A) signify in the NBI coding system?
- The bridge is closed to traffic
- The structure has no deck, such as a culvert (Correct answer)
- The superstructure has failed inspection
- The bridge is newly constructed
Correct answer: The structure has no deck, such as a culvert
NBI code N for superstructure appraisal indicates not applicable, used for structures like culverts that have no conventional superstructure.
Question 2: During highway pavement inspection in Kansas, which distress type is characterized by interconnected cracks forming polygonal shapes?
- Longitudinal cracking
- Alligator (fatigue) cracking
- Transverse cracking
- Block cracking (Correct answer)
Correct answer: Block cracking
Block cracking forms interconnected cracks creating large rectangular or polygonal blocks, typically caused by asphalt shrinkage rather than load fatigue.
Question 3: A KDOT inspector is checking expansion joints on a bridge during summer. Joints that appear completely closed should prompt concern about:
- Insufficient thermal expansion
- Potential for bridge deck buckling during further heating (Correct answer)
- Corrosion of joint components
- Inadequate drainage
Correct answer: Potential for bridge deck buckling during further heating
When expansion joints close completely in summer heat, there is no remaining capacity to accommodate further thermal expansion, risking buckling of the bridge deck.
Question 4: Which fracture-critical member (FCM) designation means that failure of the member would likely cause collapse of the bridge?
- All steel tension members
- Non-redundant steel tension members (Correct answer)
- Any primary load-carrying member
- Members with fatigue cracks
Correct answer: Non-redundant steel tension members
Fracture-critical members are non-redundant steel tension members whose failure would likely cause a portion of or the entire bridge to collapse.
Question 5: When inspecting approach slabs on a Kansas highway bridge, settlement or 'bump at the end of the bridge' most often results from:
- Thermal contraction of the slab
- Consolidation or erosion of fill beneath the slab (Correct answer)
- Overloaded truck traffic
- Alkali-silica reaction in the concrete
Correct answer: Consolidation or erosion of fill beneath the slab
Settlement of approach slabs typically results from consolidation, erosion, or washout of the embankment fill beneath the slab, creating a void.
Question 6: In the KDOT inspection rating system, a culvert rated with an NBI Item 62 score of 6 would be described as:
- Failed condition
- Serious deterioration
- Satisfactory condition (Correct answer)
- Very good condition
Correct answer: Satisfactory condition
NBI condition rating 6 (Satisfactory) indicates some minor problems but the structural element is functioning adequately without significant concern.
Question 7: During a scour critical bridge inspection, what is the inspector's first priority when scour is observed near a foundation?
- Immediately close the bridge
- Document the scour depth and notify KDOT bridge management (Correct answer)
- Place riprap around the foundation
- Conduct a full underwater inspection
Correct answer: Document the scour depth and notify KDOT bridge management
The inspector must document scour observations with measurements and photographs, then notify KDOT bridge management to determine if action plans need activation.
KDOT Highway & Bridge Inspection Procedures 3
What does a negative superstructure appraisal rating of N3 (N/A) signify in the NBI coding system?