Maryland Slab Jacking Technician
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which of the following best describes the primary purpose of slab
jacking (also known as slab lifting) in construction and structural repair
applications?
A. To completely replace damaged concrete slabs with new reinforced
concrete
B. To level and stabilize settled concrete surfaces by injecting material
beneath the slab
C. To increase the compressive strength of surface concrete by
chemical treatment only
D. To waterproof concrete slabs by applying surface sealants and
coatings only
B
Slab jacking is a repair process used to restore elevation and stability
of settled concrete slabs by injecting grout, foam, or other lifting
material beneath them, rather than replacing or merely coating the
surface.
2. In Maryland construction certification frameworks, slab jacking work is
most closely associated with which broader category of regulated
construction activity?
A. Electrical transmission installation
B. Underground storage tank remediation
, C. Concrete repair and structural stabilization under home
improvement construction
D. Highway pavement resurfacing only
C
Slab jacking falls under structural concrete repair and home
improvement activities because it modifies and restores existing
structural surfaces rather than creating entirely new infrastructure
systems.
3. What is the most common material used in modern slab jacking
applications for lightweight, high-strength lifting performance?
A. Pure sand slurry only
B. Polyurethane foam injection
C. Unmodified clay soil compaction
D. Asphalt hot mix injection
B
Polyurethane foam is widely used due to its rapid expansion, high
strength-to-weight ratio, and ability to fill voids while minimizing
added load beneath slabs.
4. A technician performing slab jacking notices continued settlement
after initial lifting. What is the most likely cause?
A. Excessive steel reinforcement in the slab
B. Incomplete void filling or unstable subgrade soil conditions
C. Over-polishing of the concrete surface
D. Excessive curing time of original concrete
B
Ongoing settlement usually indicates unresolved voids or weak soil
support beneath the slab, meaning the underlying subgrade
continues to shift or compress.
5. Which factor is MOST critical when evaluating whether a slab is
suitable for slab jacking rather than full replacement?
A. Color consistency of concrete surface
B. Presence of surface paint or coatings
C. Structural integrity of the slab and absence of major fractures
D. Age of nearby landscaping features
C
, Slab jacking is appropriate when the slab is structurally sound but
has settled; severely cracked or broken slabs often require
replacement instead.
6. During slab jacking, injection holes are drilled primarily for what
purpose?
A. To weaken the slab for easier removal
B. To allow controlled placement of lifting material beneath the slab
C. To drain groundwater permanently from the site
D. To install reinforcement bars under pressure
B
Injection holes serve as access points for the lifting medium, allowing
technicians to fill voids and raise the slab in a controlled manner.
7. Which soil condition most commonly contributes to slab settlement
requiring slab jacking intervention?
A. Highly compacted bedrock
B. Uniform gravel base with no moisture
C. Expansive or erodible soils with void formation
D. Permanently frozen permafrost
C
Expansive or erodible soils lose volume or shift under load and
moisture changes, creating voids that lead to slab sinking.
8. What is the primary risk of injecting too much lifting material too
quickly during slab jacking?
A. Improved slab flexibility
B. Over-lifting or cracking of the concrete slab
C. Permanent chemical bonding of soil layers
D. Elimination of all future settlement risks
B
Excessive or rapid injection can create uneven pressure, resulting in
slab breakage or uncontrolled lifting beyond desired elevation.
9. Which quality control step is MOST important immediately after slab
jacking is completed?
A. Painting the slab surface
B. Verifying elevation uniformity and checking for voids
C. Installing decorative edging
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which of the following best describes the primary purpose of slab
jacking (also known as slab lifting) in construction and structural repair
applications?
A. To completely replace damaged concrete slabs with new reinforced
concrete
B. To level and stabilize settled concrete surfaces by injecting material
beneath the slab
C. To increase the compressive strength of surface concrete by
chemical treatment only
D. To waterproof concrete slabs by applying surface sealants and
coatings only
B
Slab jacking is a repair process used to restore elevation and stability
of settled concrete slabs by injecting grout, foam, or other lifting
material beneath them, rather than replacing or merely coating the
surface.
2. In Maryland construction certification frameworks, slab jacking work is
most closely associated with which broader category of regulated
construction activity?
A. Electrical transmission installation
B. Underground storage tank remediation
, C. Concrete repair and structural stabilization under home
improvement construction
D. Highway pavement resurfacing only
C
Slab jacking falls under structural concrete repair and home
improvement activities because it modifies and restores existing
structural surfaces rather than creating entirely new infrastructure
systems.
3. What is the most common material used in modern slab jacking
applications for lightweight, high-strength lifting performance?
A. Pure sand slurry only
B. Polyurethane foam injection
C. Unmodified clay soil compaction
D. Asphalt hot mix injection
B
Polyurethane foam is widely used due to its rapid expansion, high
strength-to-weight ratio, and ability to fill voids while minimizing
added load beneath slabs.
4. A technician performing slab jacking notices continued settlement
after initial lifting. What is the most likely cause?
A. Excessive steel reinforcement in the slab
B. Incomplete void filling or unstable subgrade soil conditions
C. Over-polishing of the concrete surface
D. Excessive curing time of original concrete
B
Ongoing settlement usually indicates unresolved voids or weak soil
support beneath the slab, meaning the underlying subgrade
continues to shift or compress.
5. Which factor is MOST critical when evaluating whether a slab is
suitable for slab jacking rather than full replacement?
A. Color consistency of concrete surface
B. Presence of surface paint or coatings
C. Structural integrity of the slab and absence of major fractures
D. Age of nearby landscaping features
C
, Slab jacking is appropriate when the slab is structurally sound but
has settled; severely cracked or broken slabs often require
replacement instead.
6. During slab jacking, injection holes are drilled primarily for what
purpose?
A. To weaken the slab for easier removal
B. To allow controlled placement of lifting material beneath the slab
C. To drain groundwater permanently from the site
D. To install reinforcement bars under pressure
B
Injection holes serve as access points for the lifting medium, allowing
technicians to fill voids and raise the slab in a controlled manner.
7. Which soil condition most commonly contributes to slab settlement
requiring slab jacking intervention?
A. Highly compacted bedrock
B. Uniform gravel base with no moisture
C. Expansive or erodible soils with void formation
D. Permanently frozen permafrost
C
Expansive or erodible soils lose volume or shift under load and
moisture changes, creating voids that lead to slab sinking.
8. What is the primary risk of injecting too much lifting material too
quickly during slab jacking?
A. Improved slab flexibility
B. Over-lifting or cracking of the concrete slab
C. Permanent chemical bonding of soil layers
D. Elimination of all future settlement risks
B
Excessive or rapid injection can create uneven pressure, resulting in
slab breakage or uncontrolled lifting beyond desired elevation.
9. Which quality control step is MOST important immediately after slab
jacking is completed?
A. Painting the slab surface
B. Verifying elevation uniformity and checking for voids
C. Installing decorative edging
