Illinois Concrete Finishing Contractor Licensing Examination Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A Instant Download Pdf.

Illinois Concrete Finishing Contractor
Licensing Examination Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf


1. Which type of cement is most commonly used for general
construction in Illinois?
A. Rapid hardening cement
B. Ordinary Portland cement
C. Sulfate-resistant cement
D. Low-heat cement
Rationale: Ordinary Portland cement is the standard type used in
general concrete construction due to its strength and durability.

2. What is the main purpose of curing concrete?
A. To make it dry faster

, B. To prevent cracking
C. To maintain adequate moisture for hydration
D. To increase workability
Rationale: Curing maintains moisture, which allows the chemical
reaction (hydration) to continue, increasing strength and durability.

3. The slump test measures which property of fresh concrete?
A. Compressive strength
B. Workability
C. Water absorption
D. Setting time
Rationale: The slump test evaluates the consistency and workability
of concrete before it sets.

4. Which aggregate size is preferred for thin concrete slabs?
A. 1.5 inches
B. 3/8 inch
C. 2 inches
D. 1 inch
Rationale: Smaller aggregates are preferred for thin slabs to ensure
proper compaction and surface finish.

5. What is the typical water-cement ratio for durable concrete?
A. 0.9–1.0
B. 0.7–0.8
C. 0.4–0.6

, D. 0.2–0.3
Rationale: Lower water-cement ratios improve strength and reduce
permeability, resulting in more durable concrete.

6. Which finishing tool is used to smooth the surface of freshly poured
concrete?
A. Vibrator
B. Trowel
C. Screed
D. Edger
Rationale: A trowel is used for final smoothing and producing a
uniform surface finish.

7. What is the primary cause of plastic shrinkage cracks in concrete?
A. Poor mix design
B. Excessive curing
C. Rapid evaporation of water from the surface
D. Low cement content
Rationale: Rapid evaporation before concrete sets causes surface
shrinkage, leading to cracks.

8. How long is concrete typically cured to reach sufficient strength for
most construction purposes?
A. 3 days
B. 5 days
C. 7 days
y

, D. 28 days
y




Rationale: Seven days of curing allows concrete to achieve a
y y y y y y y y y




y significant portion of its designed strength, though full strength
y y y y y y y y




y develops at 28 days. y y y




9. When pouring a concrete slab, reinforcement bars should be
y y y y y y y y




y positioned:
A. On top of the slab
y y y y




B. Near the middle of the slab thickness
y y y y y y




C. Along the edges only y y y




D. Directly on the subgrade y y y




Rationale: Placing reinforcement near the middle of the slab
y y y y y y y y




y balances tensile stress distribution and prevents cracking.
y y y y y y




10. What is the main purpose of adding air-entraining agents to
y y y y y y y y y




y concrete?
A. Increase strength y




B. Improve freeze-thaw resistance y y




C. Reduce curing time y y




D. Enhance color y




Rationale: Air-entraining agents create tiny air bubbles that allow
y y y y y y y y




y water to expand during freezing, reducing damage.
y y y y y y




11. Which type of concrete finish is best for high-traffic pedestrian
y y y y y y y y y




y areas?
A. Smooth troweled y