FDOT Concrete Inspection 1 — Questions and Answers
Question 1: According to FDOT specifications, what is the minimum compressive strength (f'c) required for Class I concrete?
- 2,500 psi
- 3,000 psi (Correct answer)
- 3,500 psi
- 4,000 psi
Correct answer: 3,000 psi
FDOT Class I concrete requires a minimum compressive strength of 3,000 psi as specified in Standard Specifications Section 346.
Question 2: What FDOT specification section governs portland cement concrete for structures?
- Section 334
- Section 346 (Correct answer)
- Section 400
- Section 415
Correct answer: Section 346
FDOT Section 346 covers portland cement concrete materials and mix design requirements for structural concrete.
Question 3: When testing concrete slump on an FDOT project, how long after taking the sample must the test be completed?
- 2.5 minutes
- 5 minutes (Correct answer)
- 10 minutes
- 15 minutes
Correct answer: 5 minutes
Per AASHTO T 119 referenced in FDOT specifications, the slump test must be completed within 5 minutes of obtaining the composite sample.
Question 4: What is the maximum water-cementitious material (w/cm) ratio allowed for FDOT Class IV concrete?
- 0.40
- 0.44 (Correct answer)
- 0.50
- 0.55
Correct answer: 0.44
FDOT Class IV concrete, used in structures exposed to seawater, has a maximum w/cm ratio of 0.44 to ensure durability.
Question 5: According to FDOT specifications, what minimum curing period is required for concrete structures using water curing?
- 3 days
- 5 days
- 7 days (Correct answer)
- 14 days
Correct answer: 7 days
FDOT requires a minimum of 7 days of water curing for concrete structures to ensure adequate strength gain and durability.
Question 6: Which FDOT test method is used to determine the air content of freshly mixed concrete by the pressure method?
- FM 1-T 152 (Correct answer)
- FM 5-515
- FM 1-T 196
- FM 5-501
Correct answer: FM 1-T 152
FM 1-T 152 is the FDOT Florida Method for determining air content of freshly mixed concrete using the pressure meter.
FDOT Concrete Inspection 1
According to FDOT specifications, what is the minimum compressive strength (f'c) required for Class I concrete?