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What should be done before concrete placement? -
ANSWER-Inspect
reinforcement.
What is the primary purpose of reinforcing steel in concrete?
A. To reduce concrete weight
B. To improve appearance
C. To resist tensile forces
D. To accelerate curing
Answer: C. To resist tensile forces
Rationale: Concrete is exceptionally strong in compression but weak in
tension. Reinforcing steel provides the tensile strength necessary to resist
cracking and structural failure under applied loads.
,Concrete gains most of its strength through which process?
A. Evaporation
B. Hydration
C. Oxidation
D. Carbonation
Answer: B. Hydration
Rationale: Hydration is the chemical reaction between cement and water
that forms the hardened cement paste, giving concrete its strength and
durability.
Which reinforcing bar designation has the largest diameter?
A. #3
B. #4
C. #6
D. #8
Answer: D. #8
Rationale: Reinforcing bar numbers correspond approximately to the bar
diameter in eighths of an inch. A #8 bar has a nominal diameter of 1
inch, making it larger than #3, #4, and #6 bars.
,What is the primary function of concrete cover over reinforcing steel?
A. Improve workability
B. Reduce curing time
C. Protect reinforcement from corrosion and fire
D. Increase slump
Answer: C. Protect reinforcement from corrosion and fire
Rationale: Adequate concrete cover shields reinforcing steel from
moisture, chlorides, and high temperatures, significantly increasing the
structure's service life.
Which material is the main binding ingredient in concrete?
A. Sand
B. Gravel
C. Water
D. Portland cement
Answer: D. Portland cement
Rationale: Portland cement reacts chemically with water to bind
aggregates together, forming hardened concrete.
Which test is commonly used to measure concrete consistency?
, A. Compression test
B. Air-content test
C. Slump test
D. Sieve analysis
Answer: C. Slump test
Rationale: The slump test measures the workability and consistency of
freshly mixed concrete, helping ensure proper placement characteristics.
What is the minimum curing objective for newly placed concrete?
A. Remove forms immediately
B. Increase evaporation
C. Maintain adequate moisture and temperature
D. Eliminate hydration
Answer: C. Maintain adequate moisture and temperature
Rationale: Proper curing promotes complete hydration, allowing
concrete to achieve its intended strength and durability.
Which aggregate is classified as coarse aggregate?
A. Cement