ACI CONCRETE FIELD TESTING TECHNICIAN GRADE I EXAM – QUESTIONS AND
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
GUARANTEED PASS | LATEST EXAM UPDATE
*CORE DOMAINS*
Sampling fresh concrete (ASTM C172)
Slump test procedures (ASTM C143)
Air content testing (ASTM C231, C173)
Unit weight and yield (ASTM C138)
Making and curing test specimens (ASTM C31)
Temperature measurement (ASTM C1064)
Concrete strength testing principles (ASTM C39)
Safety, ethics, and field compliance
Concrete materials and mix behavior
Quality control and field inspection practices
*INTRODUCTION*
This examination assesses the competency of concre
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SECTION ONE: QUESTIONS 1–50
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Question 1
According to ASTM C172, what is the primary purpose of obtaining a composite sample of
fresh concrete?
A. To increase water content
B. To represent the entire batch accurately
C. To speed up testing procedures
D. To reduce air content
🟢 Correct Answer: B. To represent the entire batch accurately
🔴 Explanation: Composite sampling ensures the test sample reflects the overall
uniformity and characteristics of the entire concrete batch.
Question 2
Which ASTM standard is used for slump testing of concrete?
A. ASTM C138
B. ASTM C143
,C. ASTM C231
D. ASTM C1064
🟢 Correct Answer: B. ASTM C143
🔴 Explanation: ASTM C143 outlines the procedure for determining the slump of hydraulic
cement concrete.
Question 3
What does a high slump value generally indicate?
A. Low workability
B. High air content only
C. High workability
D. Low cement content only
🟢 Correct Answer: C. High workability
🔴 Explanation: Higher slump indicates a more fluid mix with greater workability.
Question 4
What is the correct number of layers used when rodding concrete in a slump test?
A. 2 layers
B. 3 layers
, C. 4 layers
D. 5 layers
🟢 Correct Answer: B. 3 layers
🔴 Explanation: The slump cone is filled in three equal layers, each rodded 25 times.
Question 5
Which tool is used to measure concrete temperature in the field?
A. Thermometer
B. Pressure meter
C. Hydrometer
D. Slump cone
🟢 Correct Answer: A. Thermometer
🔴 Explanation: ASTM C1064 specifies the use of a calibrated thermometer for concrete
temperature measurement.
Question 6
ASTM C31 is used for:
A. Air content testing
B. Making and curing concrete test specimens
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES |
GUARANTEED PASS | LATEST EXAM UPDATE
*CORE DOMAINS*
Sampling fresh concrete (ASTM C172)
Slump test procedures (ASTM C143)
Air content testing (ASTM C231, C173)
Unit weight and yield (ASTM C138)
Making and curing test specimens (ASTM C31)
Temperature measurement (ASTM C1064)
Concrete strength testing principles (ASTM C39)
Safety, ethics, and field compliance
Concrete materials and mix behavior
Quality control and field inspection practices
*INTRODUCTION*
This examination assesses the competency of concre
,════════════════════════════════════════════════════════
════
SECTION ONE: QUESTIONS 1–50
════════════════════════════════════════════════════════
════
Question 1
According to ASTM C172, what is the primary purpose of obtaining a composite sample of
fresh concrete?
A. To increase water content
B. To represent the entire batch accurately
C. To speed up testing procedures
D. To reduce air content
🟢 Correct Answer: B. To represent the entire batch accurately
🔴 Explanation: Composite sampling ensures the test sample reflects the overall
uniformity and characteristics of the entire concrete batch.
Question 2
Which ASTM standard is used for slump testing of concrete?
A. ASTM C138
B. ASTM C143
,C. ASTM C231
D. ASTM C1064
🟢 Correct Answer: B. ASTM C143
🔴 Explanation: ASTM C143 outlines the procedure for determining the slump of hydraulic
cement concrete.
Question 3
What does a high slump value generally indicate?
A. Low workability
B. High air content only
C. High workability
D. Low cement content only
🟢 Correct Answer: C. High workability
🔴 Explanation: Higher slump indicates a more fluid mix with greater workability.
Question 4
What is the correct number of layers used when rodding concrete in a slump test?
A. 2 layers
B. 3 layers
, C. 4 layers
D. 5 layers
🟢 Correct Answer: B. 3 layers
🔴 Explanation: The slump cone is filled in three equal layers, each rodded 25 times.
Question 5
Which tool is used to measure concrete temperature in the field?
A. Thermometer
B. Pressure meter
C. Hydrometer
D. Slump cone
🟢 Correct Answer: A. Thermometer
🔴 Explanation: ASTM C1064 specifies the use of a calibrated thermometer for concrete
temperature measurement.
Question 6
ASTM C31 is used for:
A. Air content testing
B. Making and curing concrete test specimens
