AR CL Concrete Leveling Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which of the following is the primary purpose of concrete leveling?
A. Increase concrete thickness
B. Restore surface elevation and smoothness
C. Change concrete color
D. Strengthen concrete B
Rationale: Concrete leveling is performed to restore the surface to a
level condition and ensure smoothness, not to increase thickness or
alter appearance.
2. Which method is commonly used for concrete leveling?
A. Sandblasting
B. Mudjacking (slabjacking)
C. Painting
D. Polishing
B
Rationale: Mudjacking is the most widely used method for raising
sunken concrete slabs by injecting a grout or slurry under the slab.
3. What is the primary material used in polyurethane foam concrete
leveling?
A. Cement
B. Epoxy
C. Polyurethane
D. Asphalt
C
Rationale: Polyurethane foam is injected under the slab to lift and
stabilize it because it expands and fills voids efficiently.
,4. Which equipment is essential for drilling holes in concrete for leveling?
A. Jackhammer
B. Rotary hammer drill
C. Angle grinder
D. Belt sander
B
Rationale: A rotary hammer drill is used to drill precise holes for
injecting leveling material under concrete slabs.
5. Concrete leveling is typically required when:
A. A slab shows minor cracks
B. A slab has uneven settlement
C. The concrete color fades
D. The surface is wet
B
Rationale: Uneven settlement causes slabs to sink, creating a trip
hazard and necessitating leveling.
6. Which factor affects the choice between mudjacking and polyurethane
foam?
A. Slab thickness
B. Subsurface soil condition
C. Desired cure time
D. All of the above
D
Rationale: Slab thickness, soil type, and required curing time all
influence which leveling method is most appropriate.
7. What is the first step in concrete leveling?
A. Drilling holes
B. Cleaning the slab surface
C. Injecting grout or foam
D. Sealing the slab
B
Rationale: Cleaning ensures debris does not interfere with the
injection process or adhesion of the leveling material.
8. Which safety equipment is essential for concrete leveling operations?
A. Gloves and safety glasses
B. Hearing protection
C. Dust mask
, D. All of the above
D
Rationale: Concrete leveling involves drilling, handling chemicals,
and creating dust; full PPE protects workers.
9. How long does it typically take for polyurethane foam to cure during
concrete leveling?
A. 5–10 minutes
B. 15–30 minutes
C. 1–2 hours
D. 24 hours
B
Rationale: Polyurethane foam expands and cures quickly, often
within 15–30 minutes, allowing rapid project completion.
10. What is a common cause of concrete slab settlement?
A. Soil erosion
B. Heavy rainfall
C. Poor compaction during original installation
D. All of the above
D
Rationale: Settlement can result from multiple factors, including soil
erosion, water infiltration, and inadequate compaction during initial
construction.
11. What is the recommended spacing for injection holes in
mudjacking?
A. 2–4 inches
B. 12–24 inches
C. 36–48 inches
D. 60 inches
B
Rationale: Proper spacing ensures even distribution of the grout
under the slab and effective lifting.
12. Which of the following is a potential disadvantage of mudjacking
compared to polyurethane foam?
A. Slower cure time
B. Higher material cost
C. Not environmentally safe
D. Requires specialized equipment
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which of the following is the primary purpose of concrete leveling?
A. Increase concrete thickness
B. Restore surface elevation and smoothness
C. Change concrete color
D. Strengthen concrete B
Rationale: Concrete leveling is performed to restore the surface to a
level condition and ensure smoothness, not to increase thickness or
alter appearance.
2. Which method is commonly used for concrete leveling?
A. Sandblasting
B. Mudjacking (slabjacking)
C. Painting
D. Polishing
B
Rationale: Mudjacking is the most widely used method for raising
sunken concrete slabs by injecting a grout or slurry under the slab.
3. What is the primary material used in polyurethane foam concrete
leveling?
A. Cement
B. Epoxy
C. Polyurethane
D. Asphalt
C
Rationale: Polyurethane foam is injected under the slab to lift and
stabilize it because it expands and fills voids efficiently.
,4. Which equipment is essential for drilling holes in concrete for leveling?
A. Jackhammer
B. Rotary hammer drill
C. Angle grinder
D. Belt sander
B
Rationale: A rotary hammer drill is used to drill precise holes for
injecting leveling material under concrete slabs.
5. Concrete leveling is typically required when:
A. A slab shows minor cracks
B. A slab has uneven settlement
C. The concrete color fades
D. The surface is wet
B
Rationale: Uneven settlement causes slabs to sink, creating a trip
hazard and necessitating leveling.
6. Which factor affects the choice between mudjacking and polyurethane
foam?
A. Slab thickness
B. Subsurface soil condition
C. Desired cure time
D. All of the above
D
Rationale: Slab thickness, soil type, and required curing time all
influence which leveling method is most appropriate.
7. What is the first step in concrete leveling?
A. Drilling holes
B. Cleaning the slab surface
C. Injecting grout or foam
D. Sealing the slab
B
Rationale: Cleaning ensures debris does not interfere with the
injection process or adhesion of the leveling material.
8. Which safety equipment is essential for concrete leveling operations?
A. Gloves and safety glasses
B. Hearing protection
C. Dust mask
, D. All of the above
D
Rationale: Concrete leveling involves drilling, handling chemicals,
and creating dust; full PPE protects workers.
9. How long does it typically take for polyurethane foam to cure during
concrete leveling?
A. 5–10 minutes
B. 15–30 minutes
C. 1–2 hours
D. 24 hours
B
Rationale: Polyurethane foam expands and cures quickly, often
within 15–30 minutes, allowing rapid project completion.
10. What is a common cause of concrete slab settlement?
A. Soil erosion
B. Heavy rainfall
C. Poor compaction during original installation
D. All of the above
D
Rationale: Settlement can result from multiple factors, including soil
erosion, water infiltration, and inadequate compaction during initial
construction.
11. What is the recommended spacing for injection holes in
mudjacking?
A. 2–4 inches
B. 12–24 inches
C. 36–48 inches
D. 60 inches
B
Rationale: Proper spacing ensures even distribution of the grout
under the slab and effective lifting.
12. Which of the following is a potential disadvantage of mudjacking
compared to polyurethane foam?
A. Slower cure time
B. Higher material cost
C. Not environmentally safe
D. Requires specialized equipment
