100+ Free ACI Flatwork Technician Practice Questions

Pass your ACI Concrete Flatwork Technician (Flatwork Associate) exam on the first try — instant access, no signup required.

✓ No registration✓ No credit card✓ No hidden fees✓ Start practicing immediately

100+ Questions

100% Free

1 / 10

Question 1

Score: 0/0

According to ASTM C150, which type of portland cement is designated as the general-purpose cement used for most standard flatwork applications?

Type I

Type II

Type III

Type V

to track

2026 Statistics

Key Facts: ACI Flatwork Technician Exam

Written Exam Questions

ACI Flatwork Associate program

2 hours

Time Limit

Closed-book written exam

70%

Passing Score

ACI certification policy

5 years

Certification Validity

American Concrete Institute

$175-$360

Typical Exam Fee (2026)

Varies by ACI chapter

None

Experience Required

Knowledge-only credential

The ACI Concrete Flatwork Technician (Flatwork Associate) is a 2-hour, closed-book, 50-question written exam with a 70% passing score and no experience requirement. It is based on the ACI CP-10 Craftsman Workbook and references ACI 302.1R (slab construction), ACI 117 (tolerances), ACI 305 (hot weather), and ACI 306 (cold weather). Certification is valid for 5 years. It is the knowledge-only counterpart to the Flatwork Finisher, which additionally requires 1,500 hours of field experience and a performance exam.

Sample ACI Flatwork Technician Practice Questions

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

1According to ASTM C150, which type of portland cement is designated as the general-purpose cement used for most standard flatwork applications?

A.Type I

B.Type II

C.Type III

D.Type V

Explanation: ASTM C150 defines Type I as the general-purpose portland cement used when the special properties of other types are not required. Type II offers moderate sulfate resistance, Type III is high early strength, and Type V is for high sulfate resistance. For ordinary interior and residential flatwork, Type I (or Type I/II blended cement) is the standard choice.

2A concrete mix will be placed where it will be exposed to moderate sulfate exposure from soil. Which ASTM C150 cement type is most appropriate?

A.Type II

B.Type I

C.Type III

D.White Portland Cement

Explanation: Type II portland cement has moderate sulfate resistance and is used when soil or groundwater contains moderate sulfate concentrations (typically 0.1-0.2% water-soluble sulfate in soil or 150-1500 ppm in water). Type V is used for severe sulfate exposure. Type I has no sulfate resistance enhancement, and Type III is high early strength only.

3What is the primary effect of lowering the water-cement (w/c) ratio of a concrete mix, assuming adequate workability is maintained?

A.Increased compressive strength and reduced permeability

B.Decreased compressive strength but improved workability

C.Increased bleeding and segregation

D.Reduced durability and increased shrinkage

Explanation: The water-cement ratio is the single most important factor governing concrete strength and durability. Lowering w/c produces a denser cement paste with less capillary porosity, yielding higher compressive strength, lower permeability, and better resistance to freeze-thaw damage and chemical attack. This is the core principle of Abrams' law.

4Which of the following is a supplementary cementitious material (SCM) commonly used in concrete flatwork mixes?

A.Fly ash

B.Ground limestone filler

C.Crushed stone dust

D.Portland cement clinker

Explanation: Fly ash, ground granulated blast furnace slag (slag cement), and silica fume are the three most common supplementary cementitious materials. Fly ash is a byproduct of coal combustion that reacts pozzolanically with calcium hydroxide to form additional C-S-H. Ground limestone is a filler, not an SCM in the pozzolanic sense, and clinker is the raw intermediate that becomes portland cement after grinding with gypsum.

5What is the main purpose of an air-entraining admixture in exterior concrete flatwork?

A.To improve resistance to freeze-thaw damage

B.To accelerate the setting time of the concrete

C.To increase the compressive strength of the concrete

D.To reduce the required water content by 20%

Explanation: Air-entraining admixtures create billions of microscopic, evenly distributed air bubbles in the cement paste. These provide pressure relief for water that expands when it freezes, dramatically improving freeze-thaw durability of exterior flatwork. However, entrained air does modestly reduce strength (roughly 5% per 1% added air), so it is used for durability, not strength.

6Interior concrete slabs that will receive a hard-troweled finish should generally NOT contain entrained air because:

A.Entrained air can cause delamination and blistering of hard-troweled surfaces

B.Entrained air reduces the concrete's compressive strength

C.Air-entrained concrete is more expensive than non-air-entrained mixes

D.Entrained air causes excessive bleeding at the surface

Explanation: ACI 302.1R warns that hard-troweled interior slabs should not use air-entrained concrete (typically limit < 3% air). The sealed surface produced by hard troweling traps rising air and bleed water beneath the densified layer, causing blisters and delamination. For this reason, interior slabs are usually non-air-entrained; exterior slabs subject to freeze-thaw use entrained air but typically receive a broom or float finish only.

7Which admixture is used to delay the setting time of concrete during hot weather placements?

A.Retarder (ASTM C494 Type B or D)

B.Accelerator (Type C or E)

C.Water reducer (Type A)

D.Shrinkage-reducing admixture

Explanation: ASTM C494 classifies retarders as Type B (retarding) or Type D (water-reducing and retarding). Retarders are commonly used in hot weather to extend the working time and delay initial set, giving the crew more time to place, consolidate, and finish the slab before it stiffens. Accelerators do the opposite and are used in cold weather.

8The maximum nominal aggregate size for concrete flatwork is typically governed by which of the following ACI 318 rules?

A.Not more than 1/3 the slab depth and 3/4 the clear spacing between reinforcement

B.Not more than the slab depth and 1/2 the clear cover

C.Not more than 2 inches regardless of slab thickness

D.Not more than 1/2 the slab depth and equal to the clear cover

Explanation: ACI 318 limits the maximum aggregate size to the smallest of: 1/5 of the narrowest form dimension, 1/3 the slab depth, and 3/4 the minimum clear spacing between reinforcing bars. This prevents aggregate from bridging between bars or getting wedged in thin sections. For a typical 4-inch flatwork slab this usually caps aggregate at around 1 inch.

9A well-graded aggregate gradation is preferred for flatwork concrete because it:

A.Reduces paste demand and improves workability and finishability

B.Increases the water-cement ratio for better placement

C.Produces higher bleed rates for easier finishing

D.Eliminates the need for air entrainment

Explanation: A well-graded (also called optimized) aggregate blend minimizes voids between particles, reducing the volume of cement paste needed to fill those voids. Less paste means less shrinkage, less heat of hydration, better finishability, and often better strength. Gap-graded mixes can harm workability and increase bleeding.

10According to ACI 302.1R, the subgrade under a slab-on-ground should primarily be:

A.Uniform in bearing capacity and properly compacted

B.Rigid like concrete to prevent any deflection

C.Saturated with water just before placing

D.Loose to allow the slab to settle into it

Explanation: ACI 302.1R emphasizes that the single most important characteristic of a subgrade is uniform support — not high stiffness. Soft spots, hard spots, and frost-susceptible pockets cause differential settlement and cracking. A uniformly compacted, well-drained subgrade with consistent bearing capacity is the goal, even if overall stiffness is modest.

About the ACI Flatwork Technician Exam

The ACI Concrete Flatwork Technician (now officially called Flatwork Associate) is an entry-level, knowledge-based credential from the American Concrete Institute. Unlike the Flatwork Finisher, which requires 1,500 hours of experience plus a performance exam, the Technician is a written-only exam with no experience prerequisite — making it the ideal starting point for new flatwork crew members, supervisors, and inspectors.

Assessment

Closed-book, written-only examination

Time Limit

2 hours

Passing Score

70%

Exam Fee

$175-$360 (varies by ACI chapter; CP-10 workbook usually included) (American Concrete Institute)

ACI Flatwork Technician Exam Content Outline

15%

Concrete Materials and Mix Design

Cement types I-V, supplementary cementitious materials (fly ash, slag, silica fume), aggregates, water-cement ratio, admixtures, and the basics of ACI 318 mix proportioning.

10%

Subgrade, Subbase, and Formwork

Subgrade preparation, vapor retarders, capillary break, form setting, screed rails, and placing equipment per ACI 302.1R.

10%

Placing, Consolidation, and Screeding

Discharge, placement, internal vibration, screeding techniques, bull floating, and avoiding segregation of plastic concrete.

15%

Bleed Water, Floating, and Troweling

Reading the finishing window, timing of floating/troweling, blade angles, tool selection, hard troweling, and the causes of surface defects linked to bad timing.

10%

Jointing and Joint Detailing

Contraction (control) joints, construction joints, isolation joints, expansion joints, joint depth (1/4 slab thickness), and timing of saw cuts per ACI 302.1R.

10%

Curing Methods

Water curing, wet coverings, plastic sheeting, liquid membrane-forming curing compounds (ASTM C309), internal curing, and curing durations.

10%

Hot and Cold Weather Concreting

ACI 305 hot weather practices (temperature limits, evaporation rate, plastic shrinkage mitigation) and ACI 306 cold weather practices (insulation, heated enclosures, minimum placement temperatures).

10%

Surface Finishes, FF/FL, and Tolerances

Broom, float, and trowel finishes, architectural finishes, ACI 117 tolerances, and the floor flatness (FF) and levelness (FL) numbers used for concrete floors.

Defects and Troubleshooting

Crazing, scaling, dusting, blistering, plastic shrinkage cracking, plastic settlement, map cracking, curling, and delamination — causes and prevention.

Quality Control and ASTM Testing

Slump (ASTM C143), air content (ASTM C231/C173), temperature (ASTM C1064), unit weight, and cylinder sampling (ASTM C31) basics that a flatwork technician should recognize.

10%

Safety and OSHA

OSHA 29 CFR 1926 Subpart Q (concrete and masonry), silica exposure (29 CFR 1926.1153), cement burns, PPE, fall protection, and safe use of power trowels and screeds.

How to Pass the ACI Flatwork Technician Exam

What You Need to Know

Passing score: 70%
Assessment: Closed-book, written-only examination
Time limit: 2 hours
Exam fee: $175-$360 (varies by ACI chapter; CP-10 workbook usually included)

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 Technician Study Tips from Top Performers

1Master the finishing window — know the signs for when bleed water has evaporated and the slab is ready for floating versus troweling. Premature finishing is the #1 source of scaling, crazing, and blistering.

2Memorize common jointing rules: saw cuts should be at least 1/4 of slab thickness deep, made as soon as the concrete can be cut without raveling, and contraction joint spacing is typically 24-36 times the slab thickness in inches.

3Learn ACI 305 hot weather triggers (concrete > 90°F, evaporation rate > 0.2 lb/ft²/hr) and ACI 306 cold weather triggers (air temperature < 40°F for 3+ consecutive days).

4Know the classic defects cold — crazing, scaling, dusting, blistering, plastic shrinkage cracking, plastic settlement, map cracking — and what causes each one.

5Study OSHA 29 CFR 1926 Subpart Q and the silica standard (1926.1153). Safety questions show up on every ACI flatwork exam.

6Use the ACI CP-10 Craftsman Workbook as your primary text, then drill with practice questions until you consistently score 80%+.

Frequently Asked Questions

What is the ACI Concrete Flatwork Technician certification?

The ACI Concrete Flatwork Technician — officially called the Concrete Flatwork Associate since the American Concrete Institute updated its program naming — is an entry-level, knowledge-based credential from the American Concrete Institute. It is awarded based on a closed-book, 2-hour written exam with approximately 50 multiple-choice questions and a 70% passing score. There is no experience requirement, which is the main difference from the Flatwork Finisher.

What's the difference between ACI Flatwork Technician and ACI Flatwork Finisher?

The Flatwork Technician (Associate) is a written-only exam with no experience requirement — it certifies knowledge of proper flatwork procedures. The Flatwork Finisher requires BOTH the written exam AND either (a) 1,500 hours of documented flatwork experience plus a hands-on performance exam, OR (b) 4,500 hours of experience plus the Alternative Performance Affidavit (Form D16). Technicians can upgrade to Finisher or Advanced Finisher later once they meet the experience criteria.

How many questions are on the ACI Flatwork Technician exam?

The ACI Concrete Flatwork Technician written exam has approximately 50 multiple-choice questions. It is closed-book and must be completed within 2 hours. A passing score is 70%, which means you need to answer roughly 35 of the 50 questions correctly. The exam is based on the material in the ACI CP-10 Craftsman Workbook.

How much does the ACI Flatwork Technician exam cost?

Fees are set by individual ACI local sponsoring groups (chapters), so pricing varies by region. Typical 2026 fees range from about $175 for exam-only registration up to $360-$460 when the CP-10 Craftsman Workbook and a review workshop are bundled. Contact your local ACI chapter for the exact fee in your area.

What study materials should I use for the ACI Flatwork Technician exam?

The primary study resource is ACI CP-10: Craftsman Workbook for ACI Certification of Concrete Flatwork Finishing, which contains all the technical content referenced by the exam. Supporting ACI documents include ACI 302.1R (Slabs-on-Ground), ACI 117 (Tolerances), ACI 305 (Hot Weather), ACI 306 (Cold Weather), and ACI 332 (Residential Concrete). Most candidates also complete a local ACI chapter review workshop before sitting for the exam.

How long is the ACI Flatwork Technician certification valid?

The certification is valid for 5 years from the date the exam is passed. To maintain certification, you must recertify by retaking the written exam before expiration. The certification can also be used as a stepping stone — once you accumulate 1,500 hours of documented flatwork experience, you can upgrade to Flatwork Finisher by completing the performance exam.

Do I need work experience to take the ACI Flatwork Technician exam?

No. Unlike the Flatwork Finisher certification (which requires 1,500 hours of documented experience), the Flatwork Technician / Associate level has no experience prerequisite. Anyone can register, study the CP-10 workbook, and sit for the written exam. This makes it ideal for apprentices, new crew members, inspectors, engineers, superintendents, and ready-mix drivers who want to demonstrate flatwork knowledge without a performance test.