ACI Concrete Field Testing Technician

ACI Concrete Field Testing Technician Grade II Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which ASTM standard governs the sampling of freshly mixed

concrete?

A. ASTM C31

B. ASTM C172

C. ASTM C143

D. ASTM C94

ASTM C172 establishes proper procedures to obtain representative concrete samples for testing.

• What is the primary purpose of ASTM C31?
• Measuring slump
• Sampling concrete 1 / 3

• Making and curing concrete test specimens in the field
• Determining air content

ASTM C31 covers fabrication, curing, protection, and transport of field-cured specimens.

• Which test determines the consistency of freshly mixed concrete?
• Air content test
• Slump test
• Unit weight test
• Compression test

The slump test measures workability and consistency.

4. The slump cone height is:

• 8 inches
• 12 inches
• 14 inches
• 16 inches

ASTM C143 specifies a 12-inch-high slump cone.

• How many layers are used when rodding concrete in the slump cone?
• Two
• Three
• Four
• Five

Concrete is placed in three equal layers. 2 / 3

• How many rodding strokes are required per layer during a slump test?
• 10
• 15
• 25
• 30

ASTM C143 requires 25 uniform strokes per layer.

7. A shear slump indicates:

• Excessive water
• Lack of cohesion
• Proper mix design
• High air content

Shear slump suggests insufficient cohesiveness of the concrete.

• Which ASTM standard covers air content by the pressure method?

A. ASTM C231

B. ASTM C173

C. ASTM C231

D. ASTM C138

ASTM C231 is used for normal-weight concrete using the pressure method.

• ASTM C173 is used to measure air content by which method?
• Pressure
• Volumetric
• Gravimetric
• / 3