NYC Concrete Testing Laboratory
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1.Under NYC concrete testing requirements, what is the primary purpose of
compressive strength testing of concrete cylinders?
A. To determine slump loss during transport
B. To verify air content compliance only
C. To confirm that hardened concrete achieves the specified design
strength
D. To establish aggregate gradation
Rationale: Compressive strength testing is performed to verify that
concrete placed in the structure develops the required design strength
specified in the construction documents and applicable codes.
2. Which ASTM standard is commonly used for making and curing
concrete test specimens in the field?
,A. ASTM C31
B. ASTM C39
C. ASTM C143
D. ASTM C172
Rationale: ASTM C31 establishes procedures for making and curing
concrete test specimens under field conditions prior to laboratory testing.
3. Which ASTM standard governs compressive strength testing of
cylindrical concrete specimens?
A. ASTM C231
B. ASTM C138
C. ASTM C39
D. ASTM C1064
Rationale: ASTM C39 provides the standard method for determining
compressive strength of cylindrical concrete specimens.
4. What is the principal purpose of a slump test?
A. Measure compressive strength
B. Determine aggregate moisture
C. Evaluate consistency and workability of fresh concrete
D. Measure cement content
Rationale: The slump test provides an indication of the consistency and
workability of freshly mixed concrete before placement.
, 5. Which ASTM standard covers sampling freshly mixed concrete?
A. ASTM C172
B. ASTM C31
C. ASTM C39
D. ASTM C143
Rationale: ASTM C172 establishes procedures for obtaining representative
samples of freshly mixed concrete.
6. Why must concrete samples be representative of the entire batch?
A. To reduce laboratory costs
B. To ensure test results accurately reflect the concrete delivered to the
project
C. To increase slump values
D. To accelerate curing
Rationale: Representative sampling is essential because test results are
used to assess the quality and compliance of the concrete placed in the
structure.
7. Which test is commonly used to determine the temperature of fresh
concrete?
A. ASTM C231
B. ASTM C138
, C. ASTM C39
D. ASTM C1064
Rationale: ASTM C1064 specifies the method for measuring the
temperature of freshly mixed concrete.
8. Air content testing is particularly important for concrete exposed to:
A. Interior dry environments only
B. High temperatures only
C. Freeze-thaw conditions
D. Low-cement mixtures only
Rationale: Proper air entrainment improves durability in environments
subject to freezing and thawing cycles.
9. Which ASTM standard is commonly used for pressure air meter
testing?
A. ASTM C31
B. ASTM C143
C. ASTM C231
D. ASTM C39
Rationale: ASTM C231 covers determination of air content in normal-
weight concrete using the pressure method.
10. A concrete testing laboratory must maintain impartiality
primarily because:
Qualification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1.Under NYC concrete testing requirements, what is the primary purpose of
compressive strength testing of concrete cylinders?
A. To determine slump loss during transport
B. To verify air content compliance only
C. To confirm that hardened concrete achieves the specified design
strength
D. To establish aggregate gradation
Rationale: Compressive strength testing is performed to verify that
concrete placed in the structure develops the required design strength
specified in the construction documents and applicable codes.
2. Which ASTM standard is commonly used for making and curing
concrete test specimens in the field?
,A. ASTM C31
B. ASTM C39
C. ASTM C143
D. ASTM C172
Rationale: ASTM C31 establishes procedures for making and curing
concrete test specimens under field conditions prior to laboratory testing.
3. Which ASTM standard governs compressive strength testing of
cylindrical concrete specimens?
A. ASTM C231
B. ASTM C138
C. ASTM C39
D. ASTM C1064
Rationale: ASTM C39 provides the standard method for determining
compressive strength of cylindrical concrete specimens.
4. What is the principal purpose of a slump test?
A. Measure compressive strength
B. Determine aggregate moisture
C. Evaluate consistency and workability of fresh concrete
D. Measure cement content
Rationale: The slump test provides an indication of the consistency and
workability of freshly mixed concrete before placement.
, 5. Which ASTM standard covers sampling freshly mixed concrete?
A. ASTM C172
B. ASTM C31
C. ASTM C39
D. ASTM C143
Rationale: ASTM C172 establishes procedures for obtaining representative
samples of freshly mixed concrete.
6. Why must concrete samples be representative of the entire batch?
A. To reduce laboratory costs
B. To ensure test results accurately reflect the concrete delivered to the
project
C. To increase slump values
D. To accelerate curing
Rationale: Representative sampling is essential because test results are
used to assess the quality and compliance of the concrete placed in the
structure.
7. Which test is commonly used to determine the temperature of fresh
concrete?
A. ASTM C231
B. ASTM C138
, C. ASTM C39
D. ASTM C1064
Rationale: ASTM C1064 specifies the method for measuring the
temperature of freshly mixed concrete.
8. Air content testing is particularly important for concrete exposed to:
A. Interior dry environments only
B. High temperatures only
C. Freeze-thaw conditions
D. Low-cement mixtures only
Rationale: Proper air entrainment improves durability in environments
subject to freezing and thawing cycles.
9. Which ASTM standard is commonly used for pressure air meter
testing?
A. ASTM C31
B. ASTM C143
C. ASTM C231
D. ASTM C39
Rationale: ASTM C231 covers determination of air content in normal-
weight concrete using the pressure method.
10. A concrete testing laboratory must maintain impartiality
primarily because:
