Maryland Slab Jacking Technician
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1. A slab jacking technician is asked to restore a sunken concrete
sidewalk panel that has settled due to soil erosion beneath the slab.
What is the primary objective of the slab jacking process?
A. Remove and replace the entire slab
B. Increase the slab thickness
C. Lift the slab back to its intended elevation while filling underlying voids
D. Reduce the compressive strength of the concrete
C. Lift the slab back to its intended elevation while filling underlying voids
The primary purpose of slab jacking is to restore settled concrete to its
original position by injecting material beneath the slab, filling voids and
providing support to prevent further settlement.
2. Which condition most commonly indicates that slab jacking may be an
appropriate repair method?
A. Freshly poured concrete less than 24 hours old
B. Uneven concrete caused by subsurface voids and settlement
C. Concrete requiring decorative staining
D. Reinforcing steel placement errors before pouring
,B. Uneven concrete caused by subsurface voids and settlement
Slab jacking is specifically designed to address settlement-related issues
where support beneath the slab has been lost, causing uneven surfaces
and tripping hazards.
3. Before beginning a slab jacking operation, a technician should first
perform which critical step?
A. Remove all adjacent landscaping
B. Conduct a site evaluation and determine the cause of settlement
C. Apply curing compound to the slab surface
D. Install expansion joints throughout the slab
B. Conduct a site evaluation and determine the cause of settlement
A thorough assessment helps identify underlying causes such as erosion,
poor compaction, or drainage problems that must be considered for a
successful repair.
4. During mudjacking, holes drilled through the slab are generally
intended to:
A. Relieve concrete stress permanently
B. Install reinforcing steel
C. Provide access for lifting material injection beneath the slab
D. Drain groundwater away from the slab
C. Provide access for lifting material injection beneath the slab
Injection holes allow grout or foam material to be delivered beneath the
slab where lifting and stabilization occur.
5. Which factor is most likely to contribute to long-term concrete slab
settlement?
,A. Properly compacted subgrade
B. Stable soil conditions
C. Water infiltration causing soil erosion beneath the slab
D. Adequate drainage systems
C. Water infiltration causing soil erosion beneath the slab
Water erosion can remove supporting soil and create voids beneath
concrete, resulting in settlement and uneven surfaces.
6. What is the primary safety concern associated with high-pressure
injection operations?
A. Paint overspray
B. Sudden material release or equipment failure
C. Concrete discoloration
D. Surface dust accumulation
B. Sudden material release or equipment failure
Pressurized systems can release material unexpectedly if hoses, fittings, or
equipment fail, creating hazards for workers and bystanders.
7. Polyurethane foam slab jacking differs from traditional mudjacking
because polyurethane foam:
A. Weighs significantly more than grout
B. Requires complete slab removal
C. Expands after injection to lift and stabilize slabs
D. Cannot be used outdoors
C. Expands after injection to lift and stabilize slabs
Polyurethane foam expands beneath the slab, allowing precise lifting
while adding minimal additional weight to underlying soils.
, 8. Which personal protective equipment is most essential when drilling
injection holes?
A. Sandals and short sleeves
B. Hearing protection, eye protection, and respiratory protection when
necessary
C. Cotton gloves only
D. Reflective tape only
B. Hearing protection, eye protection, and respiratory protection when
necessary
Drilling operations generate noise, flying debris, and potentially harmful
dust that require appropriate PPE.
9. A technician notices active water flow beneath a slab during
inspection. What should be done before lifting operations begin?
A. Ignore the condition and proceed
B. Increase injection pressure immediately
C. Investigate and address the water source if possible
D. Double the number of drill holes automatically
C. Investigate and address the water source if possible
Persistent water intrusion can undermine repairs and should be corrected
to improve long-term slab stability.
10. The primary purpose of filling subsurface voids during slab
jacking is to:
A. Increase concrete color uniformity
B. Provide structural support beneath the slab
C. Eliminate expansion joints
D. Reduce concrete strength
B. Provide structural support beneath the slab
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. A slab jacking technician is asked to restore a sunken concrete
sidewalk panel that has settled due to soil erosion beneath the slab.
What is the primary objective of the slab jacking process?
A. Remove and replace the entire slab
B. Increase the slab thickness
C. Lift the slab back to its intended elevation while filling underlying voids
D. Reduce the compressive strength of the concrete
C. Lift the slab back to its intended elevation while filling underlying voids
The primary purpose of slab jacking is to restore settled concrete to its
original position by injecting material beneath the slab, filling voids and
providing support to prevent further settlement.
2. Which condition most commonly indicates that slab jacking may be an
appropriate repair method?
A. Freshly poured concrete less than 24 hours old
B. Uneven concrete caused by subsurface voids and settlement
C. Concrete requiring decorative staining
D. Reinforcing steel placement errors before pouring
,B. Uneven concrete caused by subsurface voids and settlement
Slab jacking is specifically designed to address settlement-related issues
where support beneath the slab has been lost, causing uneven surfaces
and tripping hazards.
3. Before beginning a slab jacking operation, a technician should first
perform which critical step?
A. Remove all adjacent landscaping
B. Conduct a site evaluation and determine the cause of settlement
C. Apply curing compound to the slab surface
D. Install expansion joints throughout the slab
B. Conduct a site evaluation and determine the cause of settlement
A thorough assessment helps identify underlying causes such as erosion,
poor compaction, or drainage problems that must be considered for a
successful repair.
4. During mudjacking, holes drilled through the slab are generally
intended to:
A. Relieve concrete stress permanently
B. Install reinforcing steel
C. Provide access for lifting material injection beneath the slab
D. Drain groundwater away from the slab
C. Provide access for lifting material injection beneath the slab
Injection holes allow grout or foam material to be delivered beneath the
slab where lifting and stabilization occur.
5. Which factor is most likely to contribute to long-term concrete slab
settlement?
,A. Properly compacted subgrade
B. Stable soil conditions
C. Water infiltration causing soil erosion beneath the slab
D. Adequate drainage systems
C. Water infiltration causing soil erosion beneath the slab
Water erosion can remove supporting soil and create voids beneath
concrete, resulting in settlement and uneven surfaces.
6. What is the primary safety concern associated with high-pressure
injection operations?
A. Paint overspray
B. Sudden material release or equipment failure
C. Concrete discoloration
D. Surface dust accumulation
B. Sudden material release or equipment failure
Pressurized systems can release material unexpectedly if hoses, fittings, or
equipment fail, creating hazards for workers and bystanders.
7. Polyurethane foam slab jacking differs from traditional mudjacking
because polyurethane foam:
A. Weighs significantly more than grout
B. Requires complete slab removal
C. Expands after injection to lift and stabilize slabs
D. Cannot be used outdoors
C. Expands after injection to lift and stabilize slabs
Polyurethane foam expands beneath the slab, allowing precise lifting
while adding minimal additional weight to underlying soils.
, 8. Which personal protective equipment is most essential when drilling
injection holes?
A. Sandals and short sleeves
B. Hearing protection, eye protection, and respiratory protection when
necessary
C. Cotton gloves only
D. Reflective tape only
B. Hearing protection, eye protection, and respiratory protection when
necessary
Drilling operations generate noise, flying debris, and potentially harmful
dust that require appropriate PPE.
9. A technician notices active water flow beneath a slab during
inspection. What should be done before lifting operations begin?
A. Ignore the condition and proceed
B. Increase injection pressure immediately
C. Investigate and address the water source if possible
D. Double the number of drill holes automatically
C. Investigate and address the water source if possible
Persistent water intrusion can undermine repairs and should be corrected
to improve long-term slab stability.
10. The primary purpose of filling subsurface voids during slab
jacking is to:
A. Increase concrete color uniformity
B. Provide structural support beneath the slab
C. Eliminate expansion joints
D. Reduce concrete strength
B. Provide structural support beneath the slab
