NRMCA Concrete Technologist Level 2
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
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1. Which property most directly affects concrete pumpability?
A. Cement alkali content
B. Aggregate shape and grading
C. Air temperature
D. Concrete color
B. Aggregate shape and grading
Well-graded aggregates with rounded particles improve cohesion
and reduce friction, enhancing pumpability.
2. The primary purpose of supplementary cementitious materials (SCMs)
in concrete is to:
A. Increase setting time only
, B. Improve durability and/or performance
C. Reduce aggregate content
D. Eliminate curing requirements
B. Improve durability and/or performance
SCMs such as fly ash and slag enhance durability, strength
development, and workability.
3. Which test is most appropriate for measuring concrete resistance to
chloride ion penetration?
A. ASTM C143
B. ASTM C39
C. ASTM C1202
D. ASTM C231
C. ASTM C1202
This rapid chloride permeability test evaluates resistance to chloride
ion ingress.
4. High cement content in a mix without proper aggregate balance may
lead to:
A. Reduced shrinkage
B. Improved durability
C. Increased cracking potential
D. Lower heat of hydration
C. Increased cracking potential
Excess paste increases drying shrinkage and cracking risk.
,5. Which aggregate characteristic most affects concrete strength?
A. Color
B. Mineral composition
C. Surface moisture
D. Soundness
B. Mineral composition
Aggregate mineralogy influences bond strength and overall concrete
strength.
6. The fineness modulus (FM) of fine aggregate is an index of:
A. Aggregate strength
B. Aggregate cleanliness
C. Aggregate gradation
D. Aggregate absorption
C. Aggregate gradation
FM reflects the overall coarseness or fineness of sand.
7. When hot weather concreting is anticipated, which adjustment is most
effective?
A. Increase cement content
B. Use chilled mixing water
C. Reduce aggregate size
D. Eliminate air entrainment
B. Use chilled mixing water
, Lowering concrete temperature slows setting and reduces
evaporation.
8. Which admixture is specifically used to reduce water demand while
maintaining workability?
A. Accelerator
B. Retarder
C. Water reducer
D. Air-entraining agent
C. Water reducer
Water reducers improve workability at lower water–cement ratios.
9. Concrete permeability is most strongly influenced by:
A. Aggregate size
B. Cement color
C. Water–cement ratio
D. Slump value
C. Water–cement ratio
Lower water–cement ratios reduce pore connectivity and
permeability.
10. Which curing method is most effective for maintaining surface
moisture?
A. Steam curing
B. Membrane-forming curing compound
C. Dry air curing
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf
1. Which property most directly affects concrete pumpability?
A. Cement alkali content
B. Aggregate shape and grading
C. Air temperature
D. Concrete color
B. Aggregate shape and grading
Well-graded aggregates with rounded particles improve cohesion
and reduce friction, enhancing pumpability.
2. The primary purpose of supplementary cementitious materials (SCMs)
in concrete is to:
A. Increase setting time only
, B. Improve durability and/or performance
C. Reduce aggregate content
D. Eliminate curing requirements
B. Improve durability and/or performance
SCMs such as fly ash and slag enhance durability, strength
development, and workability.
3. Which test is most appropriate for measuring concrete resistance to
chloride ion penetration?
A. ASTM C143
B. ASTM C39
C. ASTM C1202
D. ASTM C231
C. ASTM C1202
This rapid chloride permeability test evaluates resistance to chloride
ion ingress.
4. High cement content in a mix without proper aggregate balance may
lead to:
A. Reduced shrinkage
B. Improved durability
C. Increased cracking potential
D. Lower heat of hydration
C. Increased cracking potential
Excess paste increases drying shrinkage and cracking risk.
,5. Which aggregate characteristic most affects concrete strength?
A. Color
B. Mineral composition
C. Surface moisture
D. Soundness
B. Mineral composition
Aggregate mineralogy influences bond strength and overall concrete
strength.
6. The fineness modulus (FM) of fine aggregate is an index of:
A. Aggregate strength
B. Aggregate cleanliness
C. Aggregate gradation
D. Aggregate absorption
C. Aggregate gradation
FM reflects the overall coarseness or fineness of sand.
7. When hot weather concreting is anticipated, which adjustment is most
effective?
A. Increase cement content
B. Use chilled mixing water
C. Reduce aggregate size
D. Eliminate air entrainment
B. Use chilled mixing water
, Lowering concrete temperature slows setting and reduces
evaporation.
8. Which admixture is specifically used to reduce water demand while
maintaining workability?
A. Accelerator
B. Retarder
C. Water reducer
D. Air-entraining agent
C. Water reducer
Water reducers improve workability at lower water–cement ratios.
9. Concrete permeability is most strongly influenced by:
A. Aggregate size
B. Cement color
C. Water–cement ratio
D. Slump value
C. Water–cement ratio
Lower water–cement ratios reduce pore connectivity and
permeability.
10. Which curing method is most effective for maintaining surface
moisture?
A. Steam curing
B. Membrane-forming curing compound
C. Dry air curing
