BCE1A Concrete Practice Exam –Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
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1.
What is the typical minimum compressive strength of structural concrete at 28
days?
A. 1500 psi
B. 2000 psi
C. 2500 psi
D. 4000 psi
Most building codes require a minimum of 2500 psi for structural applications to
ensure adequate load-bearing capacity.
2.
Which ingredient in concrete primarily controls its workability?
A. Cement
B. Aggregate
C. Water
D. Admixtures
The water content influences the slump and ease of placement, directly affecting
workability.
3.
,What is the ideal water-to-cement (w/c) ratio for durable concrete in most
structural applications?
A. 0.25
B. 0.40–0.50
C. 0.70
D. 1.0
A ratio between 0.40 and 0.50 balances strength and workability while limiting
porosity.
4.
Which test is most commonly used in the field to measure fresh concrete’s
consistency?
A. Compression test
B. Vicat test
C. Slump test
D. Flexural test
The slump test is quick, simple, and widely used to assess consistency and
workability on site.
5.
What is the main function of coarse aggregate in concrete?
A. Increases shrinkage
B. Provides bulk and reduces cement paste requirement
C. Increases workability
D. Improves durability against freezing
Coarse aggregate reduces the required paste volume, lowering cost and shrinkage.
6.
, Air-entrained concrete is mainly used to:
A. Increase slump
B. Improve freeze–thaw durability
C. Reduce water demand
D. Speed up hydration
Air voids relieve internal stresses from freezing water, improving durability in cold
climates.
7.
What happens when the water-to-cement ratio is increased significantly?
A. Higher strength
B. Lower permeability
C. Lower strength and higher permeability
D. Higher durability
Excess water creates voids after evaporation, lowering strength and increasing
porosity.
8.
Pozzolanic materials (like fly ash) are added to concrete to:
A. Increase bleeding
B. Improve long-term strength and reduce heat of hydration
C. Decrease sulfate resistance
D. Increase permeability
Pozzolans react with calcium hydroxide, enhancing durability and long-term
strength.
9.
Which type of cement is recommended for structures exposed to high sulfate
soils?
Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1.
What is the typical minimum compressive strength of structural concrete at 28
days?
A. 1500 psi
B. 2000 psi
C. 2500 psi
D. 4000 psi
Most building codes require a minimum of 2500 psi for structural applications to
ensure adequate load-bearing capacity.
2.
Which ingredient in concrete primarily controls its workability?
A. Cement
B. Aggregate
C. Water
D. Admixtures
The water content influences the slump and ease of placement, directly affecting
workability.
3.
,What is the ideal water-to-cement (w/c) ratio for durable concrete in most
structural applications?
A. 0.25
B. 0.40–0.50
C. 0.70
D. 1.0
A ratio between 0.40 and 0.50 balances strength and workability while limiting
porosity.
4.
Which test is most commonly used in the field to measure fresh concrete’s
consistency?
A. Compression test
B. Vicat test
C. Slump test
D. Flexural test
The slump test is quick, simple, and widely used to assess consistency and
workability on site.
5.
What is the main function of coarse aggregate in concrete?
A. Increases shrinkage
B. Provides bulk and reduces cement paste requirement
C. Increases workability
D. Improves durability against freezing
Coarse aggregate reduces the required paste volume, lowering cost and shrinkage.
6.
, Air-entrained concrete is mainly used to:
A. Increase slump
B. Improve freeze–thaw durability
C. Reduce water demand
D. Speed up hydration
Air voids relieve internal stresses from freezing water, improving durability in cold
climates.
7.
What happens when the water-to-cement ratio is increased significantly?
A. Higher strength
B. Lower permeability
C. Lower strength and higher permeability
D. Higher durability
Excess water creates voids after evaporation, lowering strength and increasing
porosity.
8.
Pozzolanic materials (like fly ash) are added to concrete to:
A. Increase bleeding
B. Improve long-term strength and reduce heat of hydration
C. Decrease sulfate resistance
D. Increase permeability
Pozzolans react with calcium hydroxide, enhancing durability and long-term
strength.
9.
Which type of cement is recommended for structures exposed to high sulfate
soils?
