ACI Concrete Field Testing Technician Grade I
Certification Practice Examination Newest
2025–2026 Edition | Complete Test Bank with
200 Most Tested Questions and 100% Verified
Answers with Detailed Rationales |
Comprehensive Review Based on the Current
ACI Grade I Certification Program | Tutor
Verified Success | Grade A+ | Instant
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1. A concrete sample must be obtained from a truck mixer discharge. What is
the minimum number of portions required to form a composite sample?
A. 1
B. 2
C. 3
D. 5
Answer: C ✓ (3)
Rationale: A composite sample must be obtained from at least three different
portions of the batch to ensure representativeness.
2. When performing a slump test (ASTM C143), the slump cone should be
filled in how many layers?
A. 1
, B. 2
C. 3
D. 4
Answer: C ✓ (3)
Rationale: The cone is filled in three equal layers, each rodded 25 times.
3. The primary purpose of rodding concrete in a slump test is to:
A. Increase air content
B. Consolidate each layer
C. Reduce water content
D. Measure workability directly
Answer: B ✓ (Consolidate each layer)
Rationale: Rodding ensures proper compaction and removes voids in each layer.
4. What is the standard lift height when rodding each layer of concrete in a
slump test?
A. 10 mm
B. 25 mm
C. 100 mm
D. 150 mm
Answer: C ✓ (100 mm)
Rationale: Each layer is approximately 100 mm deep before rodding.
5. The slump cone is lifted in what manner during the test?
A. Slowly over 10 seconds
B. Immediately and vertically
C. In a circular motion
D. Tilted slightly
,Answer: B ✓ (Immediately and vertically)
Rationale: The cone must be lifted vertically and without lateral or torsional
movement.
6. The time allowed to complete the slump test after sampling is typically:
A. 2 minutes
B. 5 minutes
C. 10 minutes
D. 15 minutes
Answer: C ✓ (10 minutes)
Rationale: ASTM C143 requires completion within 10 minutes after sampling
begins.
7. What tool is used to measure concrete temperature?
A. Thermometer
B. Hydrometer
C. Calorimeter
D. Psychrometer
Answer: A ✓ (Thermometer)
Rationale: A calibrated concrete thermometer is used to measure fresh concrete
temperature.
8. Which test method is used to determine air content by pressure method?
A. ASTM C143
B. ASTM C231
C. ASTM C173
D. ASTM C138
, Answer: B ✓ (ASTM C231)
Rationale: ASTM C231 uses the pressure method for normal-weight concrete air
content.
9. The purpose of curing concrete cylinders is to:
A. Reduce cement content
B. Maintain moisture and temperature
C. Increase slump
D. Speed up testing
Answer: B ✓ (Maintain moisture and temperature)
Rationale: Proper curing ensures strength development and prevents moisture
loss.
10.Concrete cylinders are typically molded in:
A. One layer
B. Two layers
C. Three layers
D. Four layers
Answer: B ✓ (Two layers)
Rationale: Standard cylinders are filled in two equal layers, each rodded.
11.When consolidating concrete by rodding, each layer must be rodded:
A. 10 times
B. 15 times
C. 25 times
D. 50 times
Answer: C ✓ (25 times)
Rationale: ASTM standards specify 25 strokes per layer for standard molds.
Certification Practice Examination Newest
2025–2026 Edition | Complete Test Bank with
200 Most Tested Questions and 100% Verified
Answers with Detailed Rationales |
Comprehensive Review Based on the Current
ACI Grade I Certification Program | Tutor
Verified Success | Grade A+ | Instant
Download PDF
1. A concrete sample must be obtained from a truck mixer discharge. What is
the minimum number of portions required to form a composite sample?
A. 1
B. 2
C. 3
D. 5
Answer: C ✓ (3)
Rationale: A composite sample must be obtained from at least three different
portions of the batch to ensure representativeness.
2. When performing a slump test (ASTM C143), the slump cone should be
filled in how many layers?
A. 1
, B. 2
C. 3
D. 4
Answer: C ✓ (3)
Rationale: The cone is filled in three equal layers, each rodded 25 times.
3. The primary purpose of rodding concrete in a slump test is to:
A. Increase air content
B. Consolidate each layer
C. Reduce water content
D. Measure workability directly
Answer: B ✓ (Consolidate each layer)
Rationale: Rodding ensures proper compaction and removes voids in each layer.
4. What is the standard lift height when rodding each layer of concrete in a
slump test?
A. 10 mm
B. 25 mm
C. 100 mm
D. 150 mm
Answer: C ✓ (100 mm)
Rationale: Each layer is approximately 100 mm deep before rodding.
5. The slump cone is lifted in what manner during the test?
A. Slowly over 10 seconds
B. Immediately and vertically
C. In a circular motion
D. Tilted slightly
,Answer: B ✓ (Immediately and vertically)
Rationale: The cone must be lifted vertically and without lateral or torsional
movement.
6. The time allowed to complete the slump test after sampling is typically:
A. 2 minutes
B. 5 minutes
C. 10 minutes
D. 15 minutes
Answer: C ✓ (10 minutes)
Rationale: ASTM C143 requires completion within 10 minutes after sampling
begins.
7. What tool is used to measure concrete temperature?
A. Thermometer
B. Hydrometer
C. Calorimeter
D. Psychrometer
Answer: A ✓ (Thermometer)
Rationale: A calibrated concrete thermometer is used to measure fresh concrete
temperature.
8. Which test method is used to determine air content by pressure method?
A. ASTM C143
B. ASTM C231
C. ASTM C173
D. ASTM C138
, Answer: B ✓ (ASTM C231)
Rationale: ASTM C231 uses the pressure method for normal-weight concrete air
content.
9. The purpose of curing concrete cylinders is to:
A. Reduce cement content
B. Maintain moisture and temperature
C. Increase slump
D. Speed up testing
Answer: B ✓ (Maintain moisture and temperature)
Rationale: Proper curing ensures strength development and prevents moisture
loss.
10.Concrete cylinders are typically molded in:
A. One layer
B. Two layers
C. Three layers
D. Four layers
Answer: B ✓ (Two layers)
Rationale: Standard cylinders are filled in two equal layers, each rodded.
11.When consolidating concrete by rodding, each layer must be rodded:
A. 10 times
B. 15 times
C. 25 times
D. 50 times
Answer: C ✓ (25 times)
Rationale: ASTM standards specify 25 strokes per layer for standard molds.
