Certification Practice Exam Questions

ACI Concrete Transportation Inspector Certification Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary role of a Concrete Transportation Inspector?
• To supervise the batching of concrete
• To ensure concrete is transported, handled, and placed according to

specifications

• To design concrete mix proportions
• To test aggregates in the lab

Rationale: The inspector ensures concrete is handled properly during

transportation to maintain quality and compliance with project specifications.

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2. The most critical factor affecting concrete quality during transport is:

• Truck driver’s skill
• Time between batching and placement
• Truck color
• Route taken

Rationale: The longer the transport time, the greater the risk of loss of

workability and premature setting.

3. ASTM C94 limits the time between batching and discharge to:

• 60 minutes
• 90 minutes
• 120 minutes
• 45 minutes

Rationale: ASTM C94 specifies 90 minutes unless a different time is

permitted by the purchaser.

• The inspector should verify that the drum of a ready-mix truck makes how

many revolutions before discharge?

• 20

B. 70–100

• 10

D. 50–60 2 / 4

Rationale: Proper mixing requires 70–100 revolutions at mixing speed to

achieve uniformity.

5. When water is added to the concrete at the jobsite, the inspector must:

• Ignore it
• Record the amount and ensure it doesn’t exceed water-cement ratio

limits

• Allow any addition needed for workability
• Restart mixing from scratch

Rationale: The inspector must ensure that added water maintains

compliance with the approved mix design and w/cm ratio.

6. The correct slump test standard is:

A. ASTM C231

B. ASTM C138

C. ASTM C143

D. ASTM C31

Rationale: ASTM C143 covers the slump test method for measuring

concrete consistency.

7. The temperature of concrete is measured according to:

A. ASTM C31 3 / 4

B. ASTM C138

C. ASTM C1064

D. ASTM C143

Rationale: ASTM C1064 specifies methods for measuring fresh concrete

temperature.

• The inspector observes that concrete has segregated during transport.

The best action is to:

• Remix briefly at high speed
• Reject the load
• Add water to restore flow
• Discharge anyway

Rationale: Segregation indicates improper handling or excessive

vibration—such concrete should be rejected.

• A concrete truck should discharge within how many revolutions after

mixing?

A. 100

B. 300

C. 150

D. 400

Rationale: ASTM C94 states discharge should be completed before 300

revolutions of the drum.

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