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

A Class A tension lap splice for a #5 bar in 3,000 psi concrete typically requires approximately 30 inches to fully develop the bar's tensile capacity.

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

ASTM C94 requires that ready-mixed concrete be discharged before 90 minutes or 300 drum revolutions have elapsed to prevent excessive hydration and loss of workability.

Question 3

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

Accepted Answer

Type S

Answer

Type S mortar has high compressive and tensile bond strength, making it the preferred choice for load-bearing exterior masonry walls and walls in contact with the ground.

Question 4

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

Accepted Answer

Slump test

Answer

The slump test (ASTM C143) measures the consistency and workability of fresh concrete by determining how much a standard cone of concrete settles after the mold is removed.

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

Vibrators should be inserted at intervals not exceeding 1.5 times the vibrator's radius of action, which typically results in maximum 18-inch spacing for standard internal vibrators.

(FCC) Florida Certified Contractors Practice Test

(FCC) Florida Certified Contractors Practice Test

FCC Concrete & Masonry Construction 3