CALIFORNIA CONCRETE CONTRACTOR LICENSE
EXAM ACTUAL PREP QUESTIONS AND WELL
REVISED ANSWERS - LATEST AND COMPLETE
UPDATE WITH VERIFIED SOLUTIONS – ASSURES
PASS
1. What is the minimum compressive strength required for structural concrete
in California residential construction?
A. 2,500 psi
B. 3,000 psi
C. 4,000 psi
D. 5,000 psi
Answer: B. 3,000 psi
Structural concrete for residential construction in California typically
requires a minimum compressive strength of 3,000 psi at 28 days according
to building codes.
2. Which type of cement is most commonly used for general-purpose concrete?
A. Type I
B. Type II
C. Type III
D. Type IV
Answer: A. Type I
Type I cement is standard Portland cement suitable for general construction,
providing adequate strength without special properties.
3. What is the primary purpose of air-entraining agents in concrete?
A. Increase compressive strength
, B. Reduce water content
C. Improve freeze-thaw resistance
D. Accelerate setting time
Answer: C. Improve freeze-thaw resistance
Air-entraining agents create microscopic air bubbles in concrete, improving
resistance to freeze-thaw cycles.
4. What is the maximum water-cement ratio recommended for high-strength
concrete?
A. 0.35
B. 0.45
C. 0.50
D. 0.60
Answer: A. 0.35
Lower water-cement ratios reduce porosity and increase the strength and
durability of concrete.
5. Which admixture is used to accelerate concrete setting in cold weather?
A. Retarder
B. Plasticizer
C. Accelerator
D. Air-entrainer
Answer: C. Accelerator
Accelerators reduce the setting time, which is essential for pouring concrete
in cold temperatures.
6. What is the proper slump range for concrete used in standard residential
footings?
A. 1–2 inches
B. 2–4 inches
, C. 4–6 inches
D. 6–8 inches
Answer: B. 2–4 inches
Concrete slump between 2–4 inches provides good workability for footings
while maintaining strength.
7. Which factor primarily affects concrete curing time?
A. Aggregate size
B. Ambient temperature
C. Cement brand
D. Color of concrete
Answer: B. Ambient temperature
Higher temperatures accelerate hydration, while colder temperatures slow
curing; curing time must be adjusted accordingly.
8. When reinforcing concrete slabs, what is the minimum concrete cover for #4
bars in a slab on grade?
A. 1 inch
B. 1.5 inches
C. 2 inches
D. 2.5 inches
Answer: A. 1 inch
The minimum cover protects the reinforcement from corrosion and ensures
proper bonding with concrete.
9. What is the purpose of a vapor barrier under a concrete slab?
A. Increase compressive strength
B. Prevent water vapor migration
C. Reduce curing time
D. Improve thermal conductivity
, Answer: B. Prevent water vapor migration
Vapor barriers prevent moisture from migrating into flooring materials and
prevent slab moisture issues.
10.Which type of aggregate is most suitable for high-strength concrete?
A. Lightweight aggregate
B. Coarse granite
C. Sand
D. Recycled glass
Answer: B. Coarse granite
Dense, strong aggregates like granite provide better compressive strength
and durability.
11.How long should concrete be cured to achieve most of its strength?
A. 1–2 days
B. 3–7 days
C. 7–14 days
D. 28 days
Answer: D. 28 days
Concrete typically reaches its design strength after 28 days of proper
curing.
12.What is the main reason for using control joints in concrete slabs?
A. Reduce curing time
B. Prevent excessive cracking
C. Increase compressive strength
D. Improve aesthetics
Answer: B. Prevent excessive cracking
Control joints create weak points where cracks can occur in a controlled
manner rather than randomly.
EXAM ACTUAL PREP QUESTIONS AND WELL
REVISED ANSWERS - LATEST AND COMPLETE
UPDATE WITH VERIFIED SOLUTIONS – ASSURES
PASS
1. What is the minimum compressive strength required for structural concrete
in California residential construction?
A. 2,500 psi
B. 3,000 psi
C. 4,000 psi
D. 5,000 psi
Answer: B. 3,000 psi
Structural concrete for residential construction in California typically
requires a minimum compressive strength of 3,000 psi at 28 days according
to building codes.
2. Which type of cement is most commonly used for general-purpose concrete?
A. Type I
B. Type II
C. Type III
D. Type IV
Answer: A. Type I
Type I cement is standard Portland cement suitable for general construction,
providing adequate strength without special properties.
3. What is the primary purpose of air-entraining agents in concrete?
A. Increase compressive strength
, B. Reduce water content
C. Improve freeze-thaw resistance
D. Accelerate setting time
Answer: C. Improve freeze-thaw resistance
Air-entraining agents create microscopic air bubbles in concrete, improving
resistance to freeze-thaw cycles.
4. What is the maximum water-cement ratio recommended for high-strength
concrete?
A. 0.35
B. 0.45
C. 0.50
D. 0.60
Answer: A. 0.35
Lower water-cement ratios reduce porosity and increase the strength and
durability of concrete.
5. Which admixture is used to accelerate concrete setting in cold weather?
A. Retarder
B. Plasticizer
C. Accelerator
D. Air-entrainer
Answer: C. Accelerator
Accelerators reduce the setting time, which is essential for pouring concrete
in cold temperatures.
6. What is the proper slump range for concrete used in standard residential
footings?
A. 1–2 inches
B. 2–4 inches
, C. 4–6 inches
D. 6–8 inches
Answer: B. 2–4 inches
Concrete slump between 2–4 inches provides good workability for footings
while maintaining strength.
7. Which factor primarily affects concrete curing time?
A. Aggregate size
B. Ambient temperature
C. Cement brand
D. Color of concrete
Answer: B. Ambient temperature
Higher temperatures accelerate hydration, while colder temperatures slow
curing; curing time must be adjusted accordingly.
8. When reinforcing concrete slabs, what is the minimum concrete cover for #4
bars in a slab on grade?
A. 1 inch
B. 1.5 inches
C. 2 inches
D. 2.5 inches
Answer: A. 1 inch
The minimum cover protects the reinforcement from corrosion and ensures
proper bonding with concrete.
9. What is the purpose of a vapor barrier under a concrete slab?
A. Increase compressive strength
B. Prevent water vapor migration
C. Reduce curing time
D. Improve thermal conductivity
, Answer: B. Prevent water vapor migration
Vapor barriers prevent moisture from migrating into flooring materials and
prevent slab moisture issues.
10.Which type of aggregate is most suitable for high-strength concrete?
A. Lightweight aggregate
B. Coarse granite
C. Sand
D. Recycled glass
Answer: B. Coarse granite
Dense, strong aggregates like granite provide better compressive strength
and durability.
11.How long should concrete be cured to achieve most of its strength?
A. 1–2 days
B. 3–7 days
C. 7–14 days
D. 28 days
Answer: D. 28 days
Concrete typically reaches its design strength after 28 days of proper
curing.
12.What is the main reason for using control joints in concrete slabs?
A. Reduce curing time
B. Prevent excessive cracking
C. Increase compressive strength
D. Improve aesthetics
Answer: B. Prevent excessive cracking
Control joints create weak points where cracks can occur in a controlled
manner rather than randomly.
