CA D-84 Epoxy Floor Systems Contractor
Exam Questions and Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf
1. What is the primary purpose of an epoxy floor system?
A. To increase the structural capacity of a concrete slab
B. To provide a durable, protective, and chemically resistant surface
C. To eliminate all moisture within concrete
D. To replace structural reinforcement
Answer: B. To provide a durable, protective, and chemically resistant
surface
Rationale: Epoxy floor systems are primarily used as protective and
decorative coatings over suitable substrates. They can provide
abrasion resistance, chemical resistance, improved cleanability, and
enhanced appearance, but they do not replace structural
reinforcement or correct major structural deficiencies in the slab.
, 2. Before applying an epoxy coating, what is one of the most
important characteristics of the concrete substrate?
A. It should contain loose dust
B. It should be structurally sound and properly prepared
C. It should have standing water
D. It should be coated with oil
Answer: B. It should be structurally sound and properly prepared
Rationale: Epoxy performance depends heavily on substrate condition.
Concrete must be sound, clean, and properly prepared so the coating
can bond effectively. Dust, oil, loose material, and other contaminants
can interfere with adhesion and cause premature failure.
3. Which surface preparation method is commonly used to remove
laitance and create a suitable concrete profile for epoxy?
A. Mechanical grinding
B. Painting with latex
C. Flooding with water
D. Applying wax
Answer: A. Mechanical grinding
Rationale: Mechanical grinding is a common preparation method for
concrete before epoxy installation. It removes weak surface material,
,contaminants, coatings, and laitance while creating a profile that
promotes mechanical adhesion between the concrete and epoxy
system.
4. What is concrete laitance?
A. A structural steel reinforcement
B. A weak layer of cementitious material and fines at the surface
C. A type of epoxy resin
D. A waterproof membrane
Answer: B. A weak layer of cementitious material and fines at the
surface
Rationale: Laitance is a relatively weak surface layer that can develop
on concrete. If it remains beneath an epoxy coating, the coating may
bond to the weak layer rather than sound concrete, increasing the
likelihood of delamination.
5. Which contaminant is particularly likely to interfere with epoxy
adhesion?
A. Clean, dry concrete
B. Oil or grease
C. Properly profiled concrete
D. Sound aggregate
, Answer: B. Oil or grease
Rationale: Oil and grease can penetrate concrete and create a bond-
breaking layer. Contaminated concrete generally requires appropriate
cleaning and mechanical preparation before an epoxy system is
installed.
6. Why is moisture testing important before installing an epoxy
floor?
A. Excessive moisture can cause coating failure
B. Moisture makes epoxy cure faster in every situation
C. Moisture permanently strengthens epoxy
D. Moisture eliminates the need for surface preparation
Answer: A. Excessive moisture can cause coating failure
Rationale: Excess moisture or vapor transmission through concrete
can cause blistering, bubbling, osmotic pressure, or loss of adhesion in
some epoxy systems. Moisture testing helps determine whether the
substrate is suitable and whether a compatible moisture-mitigation
system is necessary.
7. What is the purpose of a concrete surface profile (CSP)?
A. To measure concrete compressive strength
B. To describe the texture or roughness of the prepared surface
Exam Questions and Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf
1. What is the primary purpose of an epoxy floor system?
A. To increase the structural capacity of a concrete slab
B. To provide a durable, protective, and chemically resistant surface
C. To eliminate all moisture within concrete
D. To replace structural reinforcement
Answer: B. To provide a durable, protective, and chemically resistant
surface
Rationale: Epoxy floor systems are primarily used as protective and
decorative coatings over suitable substrates. They can provide
abrasion resistance, chemical resistance, improved cleanability, and
enhanced appearance, but they do not replace structural
reinforcement or correct major structural deficiencies in the slab.
, 2. Before applying an epoxy coating, what is one of the most
important characteristics of the concrete substrate?
A. It should contain loose dust
B. It should be structurally sound and properly prepared
C. It should have standing water
D. It should be coated with oil
Answer: B. It should be structurally sound and properly prepared
Rationale: Epoxy performance depends heavily on substrate condition.
Concrete must be sound, clean, and properly prepared so the coating
can bond effectively. Dust, oil, loose material, and other contaminants
can interfere with adhesion and cause premature failure.
3. Which surface preparation method is commonly used to remove
laitance and create a suitable concrete profile for epoxy?
A. Mechanical grinding
B. Painting with latex
C. Flooding with water
D. Applying wax
Answer: A. Mechanical grinding
Rationale: Mechanical grinding is a common preparation method for
concrete before epoxy installation. It removes weak surface material,
,contaminants, coatings, and laitance while creating a profile that
promotes mechanical adhesion between the concrete and epoxy
system.
4. What is concrete laitance?
A. A structural steel reinforcement
B. A weak layer of cementitious material and fines at the surface
C. A type of epoxy resin
D. A waterproof membrane
Answer: B. A weak layer of cementitious material and fines at the
surface
Rationale: Laitance is a relatively weak surface layer that can develop
on concrete. If it remains beneath an epoxy coating, the coating may
bond to the weak layer rather than sound concrete, increasing the
likelihood of delamination.
5. Which contaminant is particularly likely to interfere with epoxy
adhesion?
A. Clean, dry concrete
B. Oil or grease
C. Properly profiled concrete
D. Sound aggregate
, Answer: B. Oil or grease
Rationale: Oil and grease can penetrate concrete and create a bond-
breaking layer. Contaminated concrete generally requires appropriate
cleaning and mechanical preparation before an epoxy system is
installed.
6. Why is moisture testing important before installing an epoxy
floor?
A. Excessive moisture can cause coating failure
B. Moisture makes epoxy cure faster in every situation
C. Moisture permanently strengthens epoxy
D. Moisture eliminates the need for surface preparation
Answer: A. Excessive moisture can cause coating failure
Rationale: Excess moisture or vapor transmission through concrete
can cause blistering, bubbling, osmotic pressure, or loss of adhesion in
some epoxy systems. Moisture testing helps determine whether the
substrate is suitable and whether a compatible moisture-mitigation
system is necessary.
7. What is the purpose of a concrete surface profile (CSP)?
A. To measure concrete compressive strength
B. To describe the texture or roughness of the prepared surface
