FCC Concrete & Masonry Construction 3

Question 1

What is the minimum lap splice length for a #5 deformed rebar in a tension zone when f'c = 3,000 psi, per ACI 318?

Accepted Answer

30 inches

Answer

12 inches

Answer

18 inches

Answer

24 inches

Question 2

According to ASTM C94, ready-mixed concrete must be discharged within how many minutes or revolutions of the drum after the introduction of water?

Accepted Answer

90 minutes or 300 revolutions

Answer

45 minutes or 200 revolutions

Answer

60 minutes or 250 revolutions

Answer

120 minutes or 400 revolutions

Question 3

In Florida masonry construction, which mortar type is most commonly used for load-bearing exterior walls?

Accepted Answer

Type S

Answer

Type K

Answer

Type N

Answer

Type M

Question 4

What test is performed on fresh concrete to determine its consistency and workability on a job site?

Accepted Answer

Slump test

Answer

Cylinder compression test

Answer

Air content test

Answer

Unit weight test

Question 5

When vibrating freshly placed concrete, the vibrator should be inserted at intervals not exceeding how far apart to ensure proper consolidation?

Accepted Answer

18 inches

Answer

12 inches

Answer

24 inches

Answer

36 inches

Question 6

Which condition most commonly causes map cracking (crazing) on a concrete slab surface in Florida's hot climate?

Accepted Answer

Rapid surface drying before finishing

Answer

Over-vibration of the concrete

Answer

Excess aggregate in the mix

Answer

Low water-cement ratio

Question 7

Per the Florida Building Code, what is the minimum specified grout strength for masonry construction using running-bond CMU?

Accepted Answer

2,500 psi

Answer

1,500 psi

Answer

2,000 psi

Answer

3,000 psi