AR CL Concrete Leveling Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
Section 1: Concrete Leveling Fundamentals
1. What is the primary purpose of concrete leveling?
A. To increase the thickness of an existing concrete slab
B. To replace all existing concrete with new concrete
C. To raise and stabilize settled concrete to a desired elevation
D. To apply a decorative coating to concrete surfaces
Rationale: Concrete leveling restores the elevation of settled or
uneven concrete slabs by introducing material beneath the slab or
otherwise correcting its support. The objective is to improve stability,
,drainage, and usability while retaining the existing concrete when
feasible.
2. Which condition most commonly contributes to concrete slab
settlement?
A. Excessive curing time
B. Loss or consolidation of supporting soil beneath the slab
C. Applying a concrete sealer
D. Using expansion joints
Rationale: Concrete slabs depend on stable, uniform subgrade
support. When soil consolidates, erodes, becomes saturated, or moves
away from the slab, unsupported areas can develop and the slab may
settle. Proper site investigation is essential to identify the cause
before leveling.
3. What is slabjacking?
A. Removing a concrete slab with a hydraulic breaker
B. Grinding down a concrete surface
C. Installing reinforcing steel through a slab
D. Lifting a concrete slab by injecting material beneath it
,Rationale: Slabjacking, also called mudjacking in traditional
applications, involves injecting a suitable material through drilled
holes beneath a settled slab. The injected material fills voids and
applies controlled pressure to raise the slab toward the required
elevation.
4. What is the primary function of a concrete leveling injection
material?
A. To dissolve the existing concrete
B. To eliminate the need for subgrade preparation
C. To fill voids and provide support beneath the slab
D. To increase the slab's surface friction
Rationale: Injection materials are used to fill gaps beneath concrete
and establish supporting contact between the slab and the underlying
ground. Depending on the system, they may also provide lifting
pressure and improve load transfer. The material must be appropriate
for the soil, slab, and environmental conditions.
5. Which observation is most important before beginning a concrete
leveling project?
A. The color of the concrete
, B. The age of nearby buildings
C. The brand of the concrete sealer
D. The extent and cause of settlement, cracking, and loss of support
Rationale: A preconstruction assessment should establish why the slab
settled, how extensive the damage is, and whether leveling is
technically appropriate. Structural deterioration, active soil
movement, drainage problems, or inadequate slab thickness may
require repairs beyond lifting alone.
6. Which tool is commonly used to determine whether a concrete slab
is level?
A. Pipe wrench
B. Laser level or rotary laser with a receiver
C. Concrete edger
D. Rebar cutter
Rationale: A laser level establishes a reference plane that allows
workers to compare slab elevations at multiple points. These
measurements help identify settlement, establish target elevations,
and monitor lifting progress. A survey level or other suitable
elevation-measuring instrument may also be used.
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
Section 1: Concrete Leveling Fundamentals
1. What is the primary purpose of concrete leveling?
A. To increase the thickness of an existing concrete slab
B. To replace all existing concrete with new concrete
C. To raise and stabilize settled concrete to a desired elevation
D. To apply a decorative coating to concrete surfaces
Rationale: Concrete leveling restores the elevation of settled or
uneven concrete slabs by introducing material beneath the slab or
otherwise correcting its support. The objective is to improve stability,
,drainage, and usability while retaining the existing concrete when
feasible.
2. Which condition most commonly contributes to concrete slab
settlement?
A. Excessive curing time
B. Loss or consolidation of supporting soil beneath the slab
C. Applying a concrete sealer
D. Using expansion joints
Rationale: Concrete slabs depend on stable, uniform subgrade
support. When soil consolidates, erodes, becomes saturated, or moves
away from the slab, unsupported areas can develop and the slab may
settle. Proper site investigation is essential to identify the cause
before leveling.
3. What is slabjacking?
A. Removing a concrete slab with a hydraulic breaker
B. Grinding down a concrete surface
C. Installing reinforcing steel through a slab
D. Lifting a concrete slab by injecting material beneath it
,Rationale: Slabjacking, also called mudjacking in traditional
applications, involves injecting a suitable material through drilled
holes beneath a settled slab. The injected material fills voids and
applies controlled pressure to raise the slab toward the required
elevation.
4. What is the primary function of a concrete leveling injection
material?
A. To dissolve the existing concrete
B. To eliminate the need for subgrade preparation
C. To fill voids and provide support beneath the slab
D. To increase the slab's surface friction
Rationale: Injection materials are used to fill gaps beneath concrete
and establish supporting contact between the slab and the underlying
ground. Depending on the system, they may also provide lifting
pressure and improve load transfer. The material must be appropriate
for the soil, slab, and environmental conditions.
5. Which observation is most important before beginning a concrete
leveling project?
A. The color of the concrete
, B. The age of nearby buildings
C. The brand of the concrete sealer
D. The extent and cause of settlement, cracking, and loss of support
Rationale: A preconstruction assessment should establish why the slab
settled, how extensive the damage is, and whether leveling is
technically appropriate. Structural deterioration, active soil
movement, drainage problems, or inadequate slab thickness may
require repairs beyond lifting alone.
6. Which tool is commonly used to determine whether a concrete slab
is level?
A. Pipe wrench
B. Laser level or rotary laser with a receiver
C. Concrete edger
D. Rebar cutter
Rationale: A laser level establishes a reference plane that allows
workers to compare slab elevations at multiple points. These
measurements help identify settlement, establish target elevations,
and monitor lifting progress. A survey level or other suitable
elevation-measuring instrument may also be used.
