COMPLETE VERIFIED QUESTIONS AND DETAILED SOLUTIONS | LATEST UPDATE THIS YEAR JUST RELEASED
NRMCA
CONCRETE TECHNOLOGIST LEVEL 2
CERTIFICATION EXAMINATION
VERIFIED Q&A LEVEL 2 DETAILED SOLUTIONS LATEST UPDATE
, EXAM COVERAGE AREAS
Level 2: Concrete Materials & Mix Design
• Cement types ASTM C150
• Aggregates ASTM C33 fine coarse
• Admixtures ASTM C494
• Mix design ACI 211
Level 2: Properties & Testing
• Fresh properties slump air content unit weight
• Hardened strength compression flexure
• ASTM tests C143 C231 C138 C39
• Durability
Level 2: Production & Quality Control
• Batching plant operations
• Quality control QC QA
• Specifications ASTM C94
• Troubleshooting
NRMCA Concrete Technologist Level 2 Verified Solutions Latest Page 2
, QUESTION 1: ACI 211 mix design and water-cement ratio effect?
A) ACI 211 absolute volume method select slump max aggregate strength w/c ratio durability, lower
w/c higher strength lower permeability higher durability
B) No effect
C) Only higher w/c higher strength
D) No mix design
CORRECT ANSWER: A) ACI 211 absolute volume method select slump max aggregate
strength w/c ratio durability, lower w/c higher strength lower permeability higher
durability
RATIONALE: Mix design ACI 211: absolute volume method volume cement water aggregate air =27 cf per
cy. Select slump based placement, max aggregate size, estimate water air, select w/c ratio based strength
durability lower w/c higher strength Abrams law lower permeability higher durability sulfate freeze-thaw,
calculate cement, aggregate proportions fine coarse fineness modulus.
QUESTION 2: ASTM tests slump air unit weight compression?
A) Slump C143 measures workability inches, air C231 pressure method C173 volumetric, unit weight
C138 yield, compression C39 cylinder 28 day strength
B) No tests
C) Only slump
D) Only compression
CORRECT ANSWER: A) Slump C143 measures workability inches, air C231 pressure
method C173 volumetric, unit weight C138 yield, compression C39 cylinder 28 day
strength
RATIONALE: Testing: Slump ASTM C143 measures consistency workability inches true shear collapse, Air
content ASTM C231 pressure method normal weight C173 volumetric lightweight, Unit weight ASTM C138
density yield lb/cf, Temperature C1064, Compression ASTM C39 6x12 cylinders 28 day f'c psi rate loading,
flexure C78, splitting tensile C496. Quality control.
QUESTION 3: Cement types and admixtures function?
A) Type I normal II moderate sulfate heat III high early V high sulfate, admixtures Type A water
reducer B retarder D water reducer retarder F high-range G high-range retarder C accelerator
B) No types
C) Only cement
D) Only admixture
CORRECT ANSWER: A) Type I normal II moderate sulfate heat III high early V high
sulfate, admixtures Type A water reducer B retarder D water reducer retarder F
high-range G high-range retarder C accelerator
RATIONALE: Materials: Cement ASTM C150 Type I normal II moderate sulfate moderate heat of hydration
III high early strength V high sulfate resistance plus blended C595. Aggregates ASTM C33 fine FM 2.3-3.1
coarse gradation. Admixtures ASTM C494 Type A water reducer B retarder C accelerator D water reducer
retarder F high-range water reducer superplasticizer G high-range retarder, air entraining C260, fly ash
C618 pozzolan, slag C989.
QUESTION 4: ACI 211 mix design and water-cement ratio effect?
NRMCA Concrete Technologist Level 2 Verified Solutions Latest Page 3
, A) ACI 211 absolute volume method select slump max aggregate strength w/c ratio durability, lower
w/c higher strength lower permeability higher durability
B) No effect
C) Only higher w/c higher strength
D) No mix design
CORRECT ANSWER: A) ACI 211 absolute volume method select slump max aggregate
strength w/c ratio durability, lower w/c higher strength lower permeability higher
durability
RATIONALE: Mix design ACI 211: absolute volume method volume cement water aggregate air =27 cf per
cy. Select slump based placement, max aggregate size, estimate water air, select w/c ratio based strength
durability lower w/c higher strength Abrams law lower permeability higher durability sulfate freeze-thaw,
calculate cement, aggregate proportions fine coarse fineness modulus.
QUESTION 5: ASTM tests slump air unit weight compression?
A) Slump C143 measures workability inches, air C231 pressure method C173 volumetric, unit weight
C138 yield, compression C39 cylinder 28 day strength
B) No tests
C) Only slump
D) Only compression
CORRECT ANSWER: A) Slump C143 measures workability inches, air C231 pressure
method C173 volumetric, unit weight C138 yield, compression C39 cylinder 28 day
strength
RATIONALE: Testing: Slump ASTM C143 measures consistency workability inches true shear collapse, Air
content ASTM C231 pressure method normal weight C173 volumetric lightweight, Unit weight ASTM C138
density yield lb/cf, Temperature C1064, Compression ASTM C39 6x12 cylinders 28 day f'c psi rate loading,
flexure C78, splitting tensile C496. Quality control.
QUESTION 6: Cement types and admixtures function?
A) Type I normal II moderate sulfate heat III high early V high sulfate, admixtures Type A water
reducer B retarder D water reducer retarder F high-range G high-range retarder C accelerator
B) No types
C) Only cement
D) Only admixture
CORRECT ANSWER: A) Type I normal II moderate sulfate heat III high early V high
sulfate, admixtures Type A water reducer B retarder D water reducer retarder F
high-range G high-range retarder C accelerator
RATIONALE: Materials: Cement ASTM C150 Type I normal II moderate sulfate moderate heat of hydration
III high early strength V high sulfate resistance plus blended C595. Aggregates ASTM C33 fine FM 2.3-3.1
coarse gradation. Admixtures ASTM C494 Type A water reducer B retarder C accelerator D water reducer
retarder F high-range water reducer superplasticizer G high-range retarder, air entraining C260, fly ash
C618 pozzolan, slag C989.
QUESTION 7: ACI 211 mix design and water-cement ratio effect?
A) ACI 211 absolute volume method select slump max aggregate strength w/c ratio durability, lower
w/c higher strength lower permeability higher durability
NRMCA Concrete Technologist Level 2 Verified Solutions Latest Page 4
NRMCA
CONCRETE TECHNOLOGIST LEVEL 2
CERTIFICATION EXAMINATION
VERIFIED Q&A LEVEL 2 DETAILED SOLUTIONS LATEST UPDATE
, EXAM COVERAGE AREAS
Level 2: Concrete Materials & Mix Design
• Cement types ASTM C150
• Aggregates ASTM C33 fine coarse
• Admixtures ASTM C494
• Mix design ACI 211
Level 2: Properties & Testing
• Fresh properties slump air content unit weight
• Hardened strength compression flexure
• ASTM tests C143 C231 C138 C39
• Durability
Level 2: Production & Quality Control
• Batching plant operations
• Quality control QC QA
• Specifications ASTM C94
• Troubleshooting
NRMCA Concrete Technologist Level 2 Verified Solutions Latest Page 2
, QUESTION 1: ACI 211 mix design and water-cement ratio effect?
A) ACI 211 absolute volume method select slump max aggregate strength w/c ratio durability, lower
w/c higher strength lower permeability higher durability
B) No effect
C) Only higher w/c higher strength
D) No mix design
CORRECT ANSWER: A) ACI 211 absolute volume method select slump max aggregate
strength w/c ratio durability, lower w/c higher strength lower permeability higher
durability
RATIONALE: Mix design ACI 211: absolute volume method volume cement water aggregate air =27 cf per
cy. Select slump based placement, max aggregate size, estimate water air, select w/c ratio based strength
durability lower w/c higher strength Abrams law lower permeability higher durability sulfate freeze-thaw,
calculate cement, aggregate proportions fine coarse fineness modulus.
QUESTION 2: ASTM tests slump air unit weight compression?
A) Slump C143 measures workability inches, air C231 pressure method C173 volumetric, unit weight
C138 yield, compression C39 cylinder 28 day strength
B) No tests
C) Only slump
D) Only compression
CORRECT ANSWER: A) Slump C143 measures workability inches, air C231 pressure
method C173 volumetric, unit weight C138 yield, compression C39 cylinder 28 day
strength
RATIONALE: Testing: Slump ASTM C143 measures consistency workability inches true shear collapse, Air
content ASTM C231 pressure method normal weight C173 volumetric lightweight, Unit weight ASTM C138
density yield lb/cf, Temperature C1064, Compression ASTM C39 6x12 cylinders 28 day f'c psi rate loading,
flexure C78, splitting tensile C496. Quality control.
QUESTION 3: Cement types and admixtures function?
A) Type I normal II moderate sulfate heat III high early V high sulfate, admixtures Type A water
reducer B retarder D water reducer retarder F high-range G high-range retarder C accelerator
B) No types
C) Only cement
D) Only admixture
CORRECT ANSWER: A) Type I normal II moderate sulfate heat III high early V high
sulfate, admixtures Type A water reducer B retarder D water reducer retarder F
high-range G high-range retarder C accelerator
RATIONALE: Materials: Cement ASTM C150 Type I normal II moderate sulfate moderate heat of hydration
III high early strength V high sulfate resistance plus blended C595. Aggregates ASTM C33 fine FM 2.3-3.1
coarse gradation. Admixtures ASTM C494 Type A water reducer B retarder C accelerator D water reducer
retarder F high-range water reducer superplasticizer G high-range retarder, air entraining C260, fly ash
C618 pozzolan, slag C989.
QUESTION 4: ACI 211 mix design and water-cement ratio effect?
NRMCA Concrete Technologist Level 2 Verified Solutions Latest Page 3
, A) ACI 211 absolute volume method select slump max aggregate strength w/c ratio durability, lower
w/c higher strength lower permeability higher durability
B) No effect
C) Only higher w/c higher strength
D) No mix design
CORRECT ANSWER: A) ACI 211 absolute volume method select slump max aggregate
strength w/c ratio durability, lower w/c higher strength lower permeability higher
durability
RATIONALE: Mix design ACI 211: absolute volume method volume cement water aggregate air =27 cf per
cy. Select slump based placement, max aggregate size, estimate water air, select w/c ratio based strength
durability lower w/c higher strength Abrams law lower permeability higher durability sulfate freeze-thaw,
calculate cement, aggregate proportions fine coarse fineness modulus.
QUESTION 5: ASTM tests slump air unit weight compression?
A) Slump C143 measures workability inches, air C231 pressure method C173 volumetric, unit weight
C138 yield, compression C39 cylinder 28 day strength
B) No tests
C) Only slump
D) Only compression
CORRECT ANSWER: A) Slump C143 measures workability inches, air C231 pressure
method C173 volumetric, unit weight C138 yield, compression C39 cylinder 28 day
strength
RATIONALE: Testing: Slump ASTM C143 measures consistency workability inches true shear collapse, Air
content ASTM C231 pressure method normal weight C173 volumetric lightweight, Unit weight ASTM C138
density yield lb/cf, Temperature C1064, Compression ASTM C39 6x12 cylinders 28 day f'c psi rate loading,
flexure C78, splitting tensile C496. Quality control.
QUESTION 6: Cement types and admixtures function?
A) Type I normal II moderate sulfate heat III high early V high sulfate, admixtures Type A water
reducer B retarder D water reducer retarder F high-range G high-range retarder C accelerator
B) No types
C) Only cement
D) Only admixture
CORRECT ANSWER: A) Type I normal II moderate sulfate heat III high early V high
sulfate, admixtures Type A water reducer B retarder D water reducer retarder F
high-range G high-range retarder C accelerator
RATIONALE: Materials: Cement ASTM C150 Type I normal II moderate sulfate moderate heat of hydration
III high early strength V high sulfate resistance plus blended C595. Aggregates ASTM C33 fine FM 2.3-3.1
coarse gradation. Admixtures ASTM C494 Type A water reducer B retarder C accelerator D water reducer
retarder F high-range water reducer superplasticizer G high-range retarder, air entraining C260, fly ash
C618 pozzolan, slag C989.
QUESTION 7: ACI 211 mix design and water-cement ratio effect?
A) ACI 211 absolute volume method select slump max aggregate strength w/c ratio durability, lower
w/c higher strength lower permeability higher durability
NRMCA Concrete Technologist Level 2 Verified Solutions Latest Page 4
