NRMCA Concrete Durability Course Exam QUESTIONS AND CORRECT ANSWERS
WITH RATIONALES
Exam coverage
• durability mechanisms
• freeze-thaw
• chloride exposure
• sulfate exposure
• alkali-silica reaction
• permeability
• air entrainment
• materials selection
• curing
• durability troubleshooting
,1. When reviewing this equipment, which statement best applies because Freeze-thaw
durability depends strongly on a suitable entrained-air system and proper concrete
quality.. Which answer best applies to the underlying NRMCA concrete durability
concept in this situation?
A. Chloride exposure can contribute to reinforcement corrosion when chlorides penetrate to
reinforcing steel..
B. Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it..
C. Freeze-thaw durability depends strongly on a suitable entrained-air system and proper
concrete quality..
D. Sulfate exposure can damage susceptible concrete through chemical and physical
mechanisms..
Correct answer: C
Rationale: The correct choice directly states the governing principle: Freeze-thaw durability
depends strongly on a suitable entrained-air system and proper concrete quality.. The
alternatives address related topics but do not directly answer the issue being tested.
2. A supervisor asks which practice should guide the work when Chloride exposure can
contribute to reinforcement corrosion when chlorides penetrate to reinforcing steel..
Which answer best applies to the underlying NRMCA concrete durability concept in this
situation?
,A. Sulfate exposure can damage susceptible concrete through chemical and physical
mechanisms..
B. Chloride exposure can contribute to reinforcement corrosion when chlorides penetrate to
reinforcing steel..
C. Permeability influences how readily water and dissolved aggressive substances enter
concrete..
D. Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it..
Correct answer: B
Rationale: The correct choice directly states the governing principle: Chloride exposure can
contribute to reinforcement corrosion when chlorides penetrate to reinforcing steel.. The
alternatives address related topics but do not directly answer the issue being tested.
3. Which explanation best connects the technical requirement with its practical purpose
when Sulfate exposure can damage susceptible concrete through chemical and
physical mechanisms.. Which answer best applies to the underlying NRMCA concrete
durability concept in this situation?
A. Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it..
B. Air entrainment creates a system of small air voids that provides pressure-relief space
during freezing..
, C. Sulfate exposure can damage susceptible concrete through chemical and physical
mechanisms..
D. Permeability influences how readily water and dissolved aggressive substances enter
concrete..
Correct answer: C
Rationale: The correct choice directly states the governing principle: Sulfate exposure can
damage susceptible concrete through chemical and physical mechanisms.. The alternatives
address related topics but do not directly answer the issue being tested.
4. An inspection reveals this condition; which action is supported by the principle that
Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it.. Which answer best applies to the underlying NRMCA
concrete durability concept in this situation?
A. Materials selection should consider aggregate reactivity, cementitious materials, exposure,
and required performance..
B. Permeability influences how readily water and dissolved aggressive substances enter
concrete..
C. Air entrainment creates a system of small air voids that provides pressure-relief space
during freezing..
D. Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it..
WITH RATIONALES
Exam coverage
• durability mechanisms
• freeze-thaw
• chloride exposure
• sulfate exposure
• alkali-silica reaction
• permeability
• air entrainment
• materials selection
• curing
• durability troubleshooting
,1. When reviewing this equipment, which statement best applies because Freeze-thaw
durability depends strongly on a suitable entrained-air system and proper concrete
quality.. Which answer best applies to the underlying NRMCA concrete durability
concept in this situation?
A. Chloride exposure can contribute to reinforcement corrosion when chlorides penetrate to
reinforcing steel..
B. Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it..
C. Freeze-thaw durability depends strongly on a suitable entrained-air system and proper
concrete quality..
D. Sulfate exposure can damage susceptible concrete through chemical and physical
mechanisms..
Correct answer: C
Rationale: The correct choice directly states the governing principle: Freeze-thaw durability
depends strongly on a suitable entrained-air system and proper concrete quality.. The
alternatives address related topics but do not directly answer the issue being tested.
2. A supervisor asks which practice should guide the work when Chloride exposure can
contribute to reinforcement corrosion when chlorides penetrate to reinforcing steel..
Which answer best applies to the underlying NRMCA concrete durability concept in this
situation?
,A. Sulfate exposure can damage susceptible concrete through chemical and physical
mechanisms..
B. Chloride exposure can contribute to reinforcement corrosion when chlorides penetrate to
reinforcing steel..
C. Permeability influences how readily water and dissolved aggressive substances enter
concrete..
D. Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it..
Correct answer: B
Rationale: The correct choice directly states the governing principle: Chloride exposure can
contribute to reinforcement corrosion when chlorides penetrate to reinforcing steel.. The
alternatives address related topics but do not directly answer the issue being tested.
3. Which explanation best connects the technical requirement with its practical purpose
when Sulfate exposure can damage susceptible concrete through chemical and
physical mechanisms.. Which answer best applies to the underlying NRMCA concrete
durability concept in this situation?
A. Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it..
B. Air entrainment creates a system of small air voids that provides pressure-relief space
during freezing..
, C. Sulfate exposure can damage susceptible concrete through chemical and physical
mechanisms..
D. Permeability influences how readily water and dissolved aggressive substances enter
concrete..
Correct answer: C
Rationale: The correct choice directly states the governing principle: Sulfate exposure can
damage susceptible concrete through chemical and physical mechanisms.. The alternatives
address related topics but do not directly answer the issue being tested.
4. An inspection reveals this condition; which action is supported by the principle that
Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it.. Which answer best applies to the underlying NRMCA
concrete durability concept in this situation?
A. Materials selection should consider aggregate reactivity, cementitious materials, exposure,
and required performance..
B. Permeability influences how readily water and dissolved aggressive substances enter
concrete..
C. Air entrainment creates a system of small air voids that provides pressure-relief space
during freezing..
D. Alkali-silica reaction can cause expansion and cracking when reactive materials and
moisture conditions permit it..
