100+ Free ACI Flatwork Finisher Practice Questions

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You arrive on site and the subgrade is bone-dry and dusty. Before the concrete arrives, what should you do?

Start placing immediately to avoid delay

Moisten (dampen) the subgrade so it does not pull water from the mix

Sprinkle dry cement on the subgrade for bond

Cover the subgrade with curing compound

to track

2026 Statistics

Key Facts: ACI Flatwork Finisher Exam

Written Exam Questions

ACI Flatwork Finisher Policies

2 hrs

Written Exam Time

ACI Flatwork Finisher Policies

70%

Passing Score

ACI Flatwork Finisher Policies

1,500 hrs

Minimum Experience

ACI Certification Policies

5 yrs

Certification Validity

ACI Certification Policies

$320+

Typical Exam Fee

ACI local chapter schedules

The ACI Concrete Flatwork Finisher exam is a closed-book, 2-hour written test of approximately 50 multiple-choice questions with a 70% passing score, combined with 1,500 hours of documented flatwork experience plus a performance exam (or 4,500 hours plus the Alternative Performance Affidavit Form D16). Certification is valid 5 years. Content references ACI 302.1R, 302.2R, 117, 305R, 306R, 308R, and 360R, covering subgrade prep, placing, bleed water, floating, jointing, troweling, curing, hot/cold weather, defects, and safety.

Sample ACI Flatwork Finisher Practice Questions

Try these sample questions to test your ACI Flatwork Finisher exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1You arrive on site and the subgrade is bone-dry and dusty. Before the concrete arrives, what should you do?

A.Start placing immediately to avoid delay

B.Moisten (dampen) the subgrade so it does not pull water from the mix

C.Sprinkle dry cement on the subgrade for bond

D.Cover the subgrade with curing compound

Explanation: A dry, absorbent subgrade will rob water from the bottom of the slab, causing differential setting, plastic shrinkage cracking, and weak bottom surface. ACI 302.1R directs finishers to dampen (not saturate) the subgrade just before placement so it is in a saturated-surface-dry condition. Standing water must be removed before concrete is placed.

2A vapor retarder (10-mil polyethylene) is being installed directly under an interior slab that will receive vinyl flooring. Where should the concrete be placed?

A.On a sand cushion placed over the vapor retarder

B.Directly on top of the vapor retarder

C.With the vapor retarder placed on top of the fresh concrete

D.Only after the vapor retarder has been perforated for drainage

Explanation: ACI 302.2R recommends placing concrete directly on the vapor retarder when the slab will receive moisture-sensitive floor coverings. Sand between the retarder and the slab becomes a water reservoir that later drives moisture up into the flooring, causing adhesive failures. The retarder must be continuous and sealed at laps and penetrations.

3A ready-mix truck arrives with a 6-inch slump for a 4-inch interior slab. The driver offers to add water to loosen the mix for easier placement. What is the correct action?

A.Accept the water addition as long as it stays below 10 gallons

B.Reject the water addition unless it is authorized and the revised w/cm stays within the mix design

C.Add water yourself at the point of discharge after the truck leaves

D.Let the finishers add water at the surface during floating

Explanation: Uncontrolled field water additions raise the water-cementitious materials ratio, reduce strength, cause segregation, and lead to surface defects (scaling, dusting, crazing). ACI 301/302 only permit water adjustments within the approved mix design, within the 90-minute / 300-revolution window, and when documented on the delivery ticket. Adding water at the surface during finishing is never acceptable.

4What is the single most important rule for timing the first float pass on a freshly screeded slab?

A.Float immediately after screeding while the surface is still wet

B.Wait until all bleed water has disappeared from the surface

C.Float once the concrete will support a person leaving a 1/2-inch footprint

D.Float only after saw cuts have been made

Explanation: Working bleed water into the surface with a float is the leading cause of scaling, dusting, delamination, and crazing because it locally raises the w/cm at the surface. The only acceptable rule is: do not perform any closing operation (bull float, fresno, trowel) while bleed water is visible. The bull float pass that immediately follows the strike-off is the exception and is used to knock down high spots before bleeding begins.

5Which tool is pulled across the slab right after the screed to embed coarse aggregate and close the surface before bleeding begins?

A.Hand trowel

B.Bull float

C.Edger

D.Groover

Explanation: The bull float (or darby on small pours) is the first tool after the screed. It is used once, quickly, to knock down ridges, fill low spots, and embed coarse aggregate before any bleed water surfaces. Multiple or delayed bull float passes work bleed water into the surface and cause scaling.

6On a 6-inch-thick plain (unreinforced) interior slab, what is the ACI-recommended maximum contraction (control) joint spacing?

A.6 to 8 feet

B.12 to 15 feet

C.24 to 30 feet

D.40 to 60 feet

Explanation: ACI 302.1R recommends joint spacing of 24 to 36 times the slab thickness in inches, which for a 6-inch slab is 12 to 18 feet. For typical aggregate and cement contents, a spacing near 12 to 15 feet is preferred. Wider spacing tends to produce uncontrolled intermediate cracking.

7For a conventional wet saw cut in a slab on ground, what is the normal time window to make the first saw cut after finishing?

A.Within 1 hour of placement

B.4 to 12 hours after finishing, as soon as the slab will not ravel

C.24 to 48 hours after finishing

D.Only after the slab reaches full design strength

Explanation: Conventional wet saw cuts should be made 4 to 12 hours after finishing, as soon as the saw will not cause raveling of the aggregate along the cut. Waiting too long allows random shrinkage cracks to form before the joint relieves stress. Early-entry (soff-cut) saws can cut within about 1 hour.

8An exterior sidewalk develops a dusty, weak top surface about a week after placement. Which defect is this, and what is a likely cause?

A.Crazing — from early curing only

B.Dusting — from finishing bleed water into the surface or premature curing loss

C.Blistering — from an overly dry mix

D.Scaling — caused entirely by aggregate reactivity

Explanation: Dusting is a weak, powdery, low-strength surface caused by finishing while bleed water is present (raising surface w/cm), by adding water during finishing, or by rapid drying that prevents proper hydration at the top. Prevention: do not finish bleed water in, do not sprinkle water on the surface, and begin curing promptly after final troweling.

9Plastic shrinkage cracks are most likely to form when:

A.Cool, humid, windless weather allows slow bleed

B.The rate of evaporation from the surface exceeds the rate of bleeding

C.The slab is cured with wet burlap too early

D.Concrete is placed at a 2-inch slump

Explanation: Plastic shrinkage cracks occur in fresh concrete when surface water evaporates faster than bleed water can replace it, causing the surface to shrink while the bottom of the slab cannot. ACI 305R identifies the critical threshold at about 0.2 lb/ft²/hr using the nomograph based on air and concrete temperature, humidity, and wind. Prevention: fog mist, windbreaks, evaporation retarders, sunshades, and prompt curing.

10Which curing compound specification is commonly referenced on flatwork finishing jobs?

A.ASTM C94

B.ASTM C309

C.ASTM A615

D.ASTM C33

Explanation: ASTM C309 covers liquid membrane-forming compounds for curing concrete. It specifies Type 1 (clear), Type 1-D (clear with fugitive dye), and Type 2 (white pigmented) products and Class A or B resins. ACI 302.1R allows C309 compounds as one method of curing flatwork.

About the ACI Flatwork Finisher Exam

The ACI Concrete Flatwork Finisher certification validates the hands-on skills of workers placing and finishing concrete flatwork. The 2-hour closed-book written exam has approximately 50 multiple-choice questions with a 70% passing score, and must be paired with documented experience (1,500 hours) and a performance exam, or 4,500 hours with the Alternative Performance Affidavit (Form D16). Content is drawn from ACI 302.1R, 302.2R, 117, 305R, 306R, 308R, and 360R and focuses on subgrade preparation, placing, bleed water, floating, jointing, troweling, curing, weather effects, defect prevention, and OSHA safety.

Questions

50 scored questions

Time Limit

2 hours

Passing Score

70%

Exam Fee

$320-$420 (varies by chapter) (American Concrete Institute (ACI))

ACI Flatwork Finisher Exam Content Outline

10%

Subgrade, Subbase, and Vapor Retarders

Moisture conditioning, compaction, ASTM E1745 vapor retarders, ACI 302.2R

Forms and Screeding

Edge forms, bulkheads, screed rails, vibrating/laser screeds, strike-off

10%

Placing Concrete and Mix Properties

Slump, drop height, segregation, w/cm, air entrainment, field water additions

10%

Bleed Water and Floating

Bleed-water rule, bull float timing, fresno, hand float, power float window

15%

Jointing and Saw-Cut Timing

Contraction, isolation, construction joints, 24x-36x rule, T/4 depth, green-cut vs wet saw, sealants

12%

Troweling and Surface Finishes

Pan floats, combination/finish blades, broom, stamped, exposed aggregate, dry-shake hardeners, FF/FL tolerances

10%

Curing

ASTM C309 compounds, wet burlap, ponding, plastic sheets, curing duration, densifiers

10%

Hot and Cold Weather Placement

ACI 305R evaporation nomograph, fogging, sunshades; ACI 306R protection, insulating blankets, non-chloride accelerators

15%

Surface Defects and Prevention

Plastic shrinkage, crazing, dusting, blistering, scaling, delamination, random cracks, deicer damage

How to Pass the ACI Flatwork Finisher Exam

What You Need to Know

Passing score: 70%
Exam length: 50 questions
Time limit: 2 hours
Exam fee: $320-$420 (varies by chapter)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ACI Flatwork Finisher Study Tips from Top Performers

1Memorize the bleed-water rule — no closing operations while bleed water is visible on the surface

2Know the joint spacing rule of thumb: 24 to 36 times the slab thickness in inches, and T/4 saw cut depth

3Memorize saw-cut timing: 4-12 hours for conventional wet saws, about 1 hour for early-entry (green-cut) dry blades

4Understand why hard-troweling air-entrained exterior concrete causes delamination and is prohibited

5Study ACI 305R hot weather controls (fogging, windbreaks, sunshades) and ACI 306R cold weather protection (above 50°F, no calcium chloride in reinforced slabs)

6Match defects to causes: dusting/scaling/crazing/blistering/delamination/plastic shrinkage — know the field practices that cause each

Frequently Asked Questions

What is on the ACI Concrete Flatwork Finisher written exam?

A closed-book, 2-hour multiple-choice test of approximately 50 questions. A 70% score is required to pass. Content is drawn from ACI 302.1R Guide for Concrete Floor and Slab Construction and the ACI CP-10 Workbook.

What experience do I need to earn ACI Flatwork Finisher certification?

You must document 1,500 hours (about 1 year) of approved flatwork finishing experience and pass the performance examination, OR document 4,500 hours (about 3 years) and complete the Alternative Performance Affidavit (Form D16) in lieu of the performance exam.

How long is the certification valid?

ACI Concrete Flatwork Finisher certification is valid for 5 years from the date you successfully complete all requirements.

How much does the exam cost in 2026?

Fees are set by local ACI chapters and typically range from about $320 to $420 for the exam alone; exam-and-class packages can run $400-$500. Contact your nearest ACI chapter for current 2026 pricing.

What is the most important rule for a flatwork finisher?

Never work bleed water into the surface. Wait for all visible bleed water to dissipate before floating or troweling. Finishing bleed water in (or adding water to the surface) is the leading cause of dusting, scaling, crazing, and delamination.