Free Red Seal Concrete Finisher Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Red Seal Concrete Finisher Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A concrete finisher regularly cuts hardened concrete containing crystalline silica. Which occupational lung disease is associated with inhaling the resulting silica dust?

   1. A.Asbestosis
   2. B.SilicosisCorrect answer: B
   3. C.Siderosis
   4. D.Stannosis

   Explanation: CCOHS states that "Silicosis is caused by inhaling dust that contains free crystalline silica." The identified exposure is inhaled silica from cutting concrete. Asbestosis, siderosis and stannosis are associated with other mineral dusts.

   Reference: CCOHS: Silicosis — What causes silicosis?

2. 2Before placing concrete against reusable forms, a finisher needs to help the hardened concrete separate cleanly from the form face. Which product is intended for this purpose?

   1. A.Bonding agent
   2. B.Curing compound
   3. C.Evaporation reducer
   4. D.Form release agentCorrect answer: D

   Explanation: The Caltrans construction manual explains: "Without form release agents, the forms will adhere to the surface of the concrete when the forms are stripped." A form release agent addresses the form-to-concrete contact. Bonding agents, curing compounds and evaporation reducers have other concrete applications.

   Reference: Caltrans Reinforced Concrete Construction Manual — Chapter 3, section 3-7.01, Form Release

3. 3During placement, a finisher notices that the coarse aggregate is separating from the mortar in the fresh mix. What is this condition called?

   1. A.Crazing
   2. B.Bleeding
   3. C.Scaling
   4. D.SegregationCorrect answer: D

   Explanation: The Red Seal standard defines segregation as the "separation of various ingredients within a concrete mix." Aggregate separating from mortar matches that definition; bleeding refers to water rising, whereas crazing and scaling describe other surface conditions.

   Reference: Red Seal Occupational Standard – Concrete Finisher — Appendix C – Glossary, p. 104, segregation

4. 4After a non-air-entrained interior slab has been floated, the specifications call for a smooth, hard, dense surface. Which finishing operation should the finisher select?

   1. A.Steel trowelingCorrect answer: A
   2. B.Broom texturing
   3. C.Groove jointing
   4. D.Wood floating

   Explanation: The American Cement Association states: "If you want a smooth, hard, dense surface, trowel your surface after floating it using a steel trowel." Broom texturing creates slip resistance; groove jointing forms joints, and wood floating precedes the specified dense finish.

   Reference: American Cement Association – Working with Concrete — Troweling

5. 5A finisher needs to form a planned cut in a slab to control where shrinkage cracks occur. Which joint serves this purpose?

   1. A.Construction joint
   2. B.Contraction jointCorrect answer: B
   3. C.Expansion joint
   4. D.Isolation joint

   Explanation: The Red Seal glossary defines a contraction or control joint as "a joint cut to control cracking in concrete." A construction joint joins successive placements; isolation and expansion joints address separation or movement.

   Reference: Red Seal Occupational Standard – Concrete Finisher — Appendix C – Glossary, p. 102, contraction/control joint

6. 6A partial-depth pavement repair meets a working joint. What should a finisher place at the joint to keep the new repair from bearing directly on the adjacent concrete?

   1. A.A compressible joint insertCorrect answer: A
   2. B.A rigid reinforcing dowel
   3. C.A cementitious bonding grout
   4. D.A rigid formwork spacer

   Explanation: For this repair condition, FHWA states: "The compressible insert reforms the joint or crack and keeps the new repair from bearing on the adjacent concrete." The insert maintains separation at the working joint; a dowel, bonding grout or rigid spacer does not provide that compressible separation.

   Reference: FHWA Partial-Depth Repairs – Construction — 4.5 Placing the Joint Insert

7. 7A rectangular slab is 6 m long, 4 m wide and uniformly 0.15 m thick. Before allowing for waste, what volume of concrete is needed?

   1. A.0.36 m³
   2. B.0.90 m³
   3. C.3.60 m³Correct answer: C
   4. D.24.0 m³

   Explanation: The Canadian trades workbook states: "Volume of a rectangular prism equals length times width times height." Thus 6 m × 4 m × 0.15 m = 3.60 m³. Using 0.015 m for the thickness gives 0.36 m³; omitting the 4 m width gives 0.90 m³; omitting the thickness gives 24.0 m³.

   Reference: Essential Skills Workbook for Trades — Geometry formulas

8. 8While preparing a slab site, a finisher follows the specified procedure to compact the prepared subgrade. What is the principal support-related purpose of compaction?

   1. A.Increase load capacity and reduce potential settlementCorrect answer: A
   2. B.Increase vapour resistance and reduce potential dampness
   3. C.Increase movement capacity and reduce potential restraint
   4. D.Increase drainage capacity and reduce potential saturation

   Explanation: FHWA says the purpose of compaction is "to enhance the strength or load carrying capacity of the material, while minimizing long-term settlement potential." Vapour protection, isolation and drainage are addressed by other parts of the site and slab design.

   Reference: FHWA Geotechnical Aspects of Pavements Reference Manual — 8.4.4 Field Compaction

9. 9After screeding a fresh slab, a finisher needs a long-handled tool with a broad, flat rectangular head to smooth its unformed surface. Which tool fits this description?

   1. A.Hand float
   2. B.Darby float
   3. C.Bull floatCorrect answer: C
   4. D.Screed rod

   Explanation: The Red Seal glossary describes a bull float as "a tool comprising a large, flat, rectangular piece of wood or magnesium attached with a long handle used to smooth unformed surfaces of freshly placed concrete." A hand float, darby float and screed rod are different finishing or levelling tools.

   Reference: Red Seal Occupational Standard – Concrete Finisher — Appendix C – Glossary, p. 101, bull float

10. 10A finisher needs to form a contraction joint by hand in plastic concrete. Which tool is designed to form the joint?

    1. A.Hand edger
    2. B.Hand grooverCorrect answer: B
    3. C.Hand float
    4. D.Hand trowel

    Explanation: The American Cement Association recommends: "Make contraction joints with a hand groover" or suitable inserts. An edger shapes a slab edge, while a hand float and hand trowel are used for finishing the surface.

    Reference: American Cement Association – Working with Concrete — Jointing