CONCRETE CONTRACTOR LICENSING EXAM
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES Q $A
2026 INSTANTANT DOWNOAD PDF
1. What is the primary purpose of concrete curing?
A. To reduce concrete strength
B. To prevent cracking and ensure proper hydration
C. To make concrete lighter
D. To speed up setting without water
Correct answer: B. To prevent cracking and ensure proper hydration.
Curing maintains adequate moisture and temperature, allowing
concrete to achieve its intended strength and durability.
2. What is the typical water-cement ratio for normal concrete?
A. 0.2 – 0.3
B. 0.4 – 0.6
C. 0.7 – 0.9
D. 1.0 – 1.2
Correct answer: B. 0.4 – 0.6. A proper water-cement ratio ensures
workability while maintaining strength and durability of concrete.
,3. Which type of cement is commonly used for high-strength
structural concrete?
A. Type I
B. Type II
C. Type III
D. Type IV
Correct answer: C. Type III. Type III cement is a high-early-strength
cement suitable for projects requiring rapid strength gain.
4. What is the main function of aggregate in concrete?
A. To replace cement
B. To reduce shrinkage and improve dimensional stability
C. To increase water content
D. To accelerate curing
Correct answer: B. To reduce shrinkage and improve dimensional
stability. Aggregates provide volume, strength, and minimize shrinkage
in hardened concrete.
5. What is slump in concrete testing?
A. A measure of density
B. A measure of workability
C. A measure of curing time
D. A measure of aggregate size
Correct answer: B. A measure of workability. Slump test indicates the
consistency and ease of placement of concrete.
,6. Which admixture is used to accelerate concrete setting?
A. Retarder
B. Superplasticizer
C. Accelerator
D. Air-entrainer
Correct answer: C. Accelerator. Accelerators reduce setting time and
allow faster strength gain.
7. Why is proper compaction important in concrete placement?
A. To increase water content
B. To remove air pockets and voids
C. To reduce cement usage
D. To make concrete lighter
Correct answer: B. To remove air pockets and voids. Proper compaction
ensures durability, strength, and prevents honeycombing.
8. Which type of concrete is suitable for cold-weather construction?
A. Lightweight concrete
B. Air-entrained concrete
C. High-slump concrete
D. Fiber-reinforced concrete
Correct answer: B. Air-entrained concrete. Air-entrainment improves
freeze-thaw resistance in cold climates.
, 9. What is the main purpose of reinforcement in concrete?
A. To prevent water absorption
B. To provide tensile strength
C. To make concrete lighter
D. To increase slump
Correct answer: B. To provide tensile strength. Reinforcing steel helps
concrete resist tensile forces, as concrete alone is weak in tension.
10. What is the ideal temperature range for placing concrete?
A. 0°C – 5°C
B. 10°C – 25°C
C. 30°C – 40°C
D. 50°C – 60°C
Correct answer: B. 10°C – 25°C. Extreme temperatures can negatively
affect setting, strength gain, and curing.
11. How does a retarder admixture affect concrete?
A. Speeds up setting
B. Slows down setting
C. Reduces slump
D. Increases air content
Correct answer: B. Slows down setting. Retarders are useful in hot
climates or for long transportation times.
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES Q $A
2026 INSTANTANT DOWNOAD PDF
1. What is the primary purpose of concrete curing?
A. To reduce concrete strength
B. To prevent cracking and ensure proper hydration
C. To make concrete lighter
D. To speed up setting without water
Correct answer: B. To prevent cracking and ensure proper hydration.
Curing maintains adequate moisture and temperature, allowing
concrete to achieve its intended strength and durability.
2. What is the typical water-cement ratio for normal concrete?
A. 0.2 – 0.3
B. 0.4 – 0.6
C. 0.7 – 0.9
D. 1.0 – 1.2
Correct answer: B. 0.4 – 0.6. A proper water-cement ratio ensures
workability while maintaining strength and durability of concrete.
,3. Which type of cement is commonly used for high-strength
structural concrete?
A. Type I
B. Type II
C. Type III
D. Type IV
Correct answer: C. Type III. Type III cement is a high-early-strength
cement suitable for projects requiring rapid strength gain.
4. What is the main function of aggregate in concrete?
A. To replace cement
B. To reduce shrinkage and improve dimensional stability
C. To increase water content
D. To accelerate curing
Correct answer: B. To reduce shrinkage and improve dimensional
stability. Aggregates provide volume, strength, and minimize shrinkage
in hardened concrete.
5. What is slump in concrete testing?
A. A measure of density
B. A measure of workability
C. A measure of curing time
D. A measure of aggregate size
Correct answer: B. A measure of workability. Slump test indicates the
consistency and ease of placement of concrete.
,6. Which admixture is used to accelerate concrete setting?
A. Retarder
B. Superplasticizer
C. Accelerator
D. Air-entrainer
Correct answer: C. Accelerator. Accelerators reduce setting time and
allow faster strength gain.
7. Why is proper compaction important in concrete placement?
A. To increase water content
B. To remove air pockets and voids
C. To reduce cement usage
D. To make concrete lighter
Correct answer: B. To remove air pockets and voids. Proper compaction
ensures durability, strength, and prevents honeycombing.
8. Which type of concrete is suitable for cold-weather construction?
A. Lightweight concrete
B. Air-entrained concrete
C. High-slump concrete
D. Fiber-reinforced concrete
Correct answer: B. Air-entrained concrete. Air-entrainment improves
freeze-thaw resistance in cold climates.
, 9. What is the main purpose of reinforcement in concrete?
A. To prevent water absorption
B. To provide tensile strength
C. To make concrete lighter
D. To increase slump
Correct answer: B. To provide tensile strength. Reinforcing steel helps
concrete resist tensile forces, as concrete alone is weak in tension.
10. What is the ideal temperature range for placing concrete?
A. 0°C – 5°C
B. 10°C – 25°C
C. 30°C – 40°C
D. 50°C – 60°C
Correct answer: B. 10°C – 25°C. Extreme temperatures can negatively
affect setting, strength gain, and curing.
11. How does a retarder admixture affect concrete?
A. Speeds up setting
B. Slows down setting
C. Reduces slump
D. Increases air content
Correct answer: B. Slows down setting. Retarders are useful in hot
climates or for long transportation times.
