100+ Free AZ ROC C-9 Concrete Practice Questions

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2026 Statistics

Key Facts: AZ ROC C-9 Concrete Exam

50 Questions

Official Question Count

PSI Candidate Information Bulletin

120 Minutes

Time Limit

PSI Candidate Information Bulletin

70%

Passing Score

Arizona Registrar of Contractors

$66

Exam Fee

PSI Services LLC

Open Book Computerized MCQ

Exam Format

PSI / AZ ROC Guidelines

100 Questions

Practice Question Bank

OpenExamPrep Practice Bank

The Arizona ROC C-9/CR-9/R-9 Concrete Examination consists of 50 scored multiple-choice questions administered in a 120-minute open-book PSI computer-delivered session with a 70% passing threshold ($66 exam fee). This online practice bank provides 100 realistic English-language practice questions with detailed technical explanations, code citations, and worked calculations adapted for exam preparation.

Sample AZ ROC C-9 Concrete Practice Questions

Try these sample questions to test your AZ ROC C-9 Concrete exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A concrete contractor is estimating the concrete volume required for a building slab measuring 40 feet wide by 60 feet long with a specified thickness of 6 inches. Allowing a 10% waste factor for subgrade irregularities and spillage, how many cubic yards of concrete should be ordered?

A.48.9 cu yd

B.44.4 cu yd

C.53.3 cu yd

D.60.0 cu yd

Explanation: Calculate volume in cubic feet: 40 ft x 60 ft x 0.5 ft = 1,200 cu ft. Convert to cubic yards by dividing by 27: 1,200 / 27 = 44.44 cu yd. Adding a 10% waste factor yields 44.44 x 1.10 = 48.89 cu yd, which rounds up to 48.9 cu yd.

2A continuous perimeter footing has a total centerline length of 200 linear feet, a width of 24 inches, and a depth of 12 inches. If a 5% waste factor is included in the material takeoff, what is the total volume of concrete required?

A.14.8 cu yd

B.15.6 cu yd

C.18.5 cu yd

D.22.2 cu yd

Explanation: Convert dimensions to feet: width = 2 ft, depth = 1 ft. Volume = 200 ft x 2 ft x 1 ft = 400 cu ft. Convert to cubic yards: 400 / 27 = 14.81 cu yd. Applying a 5% waste factor gives 14.81 x 1.05 = 15.55 cu yd, which rounds to 15.6 cu yd.

3A concrete foundation plan requires 1,200 linear feet of #5 reinforcing steel. Standard #5 rebar weighs 1.043 lbs per linear foot. What is the total estimated weight of the required rebar (excluding lap splices)?

A.800 lbs

B.1,043 lbs

C.1,252 lbs

D.1,800 lbs

Explanation: Multiply the linear footage by the unit weight of #5 bar: 1,200 ft x 1.043 lbs/ft = 1,251.6 lbs. Rounding to the nearest whole pound gives 1,252 lbs.

4An estimator must calculate the total concrete volume for 16 circular pier columns. Each pier is 24 inches in diameter and 10 feet deep. What is the total concrete volume needed for all 16 piers (net volume without waste)?

A.12.4 cu yd

B.31.2 cu yd

C.24.8 cu yd

D.18.6 cu yd

Explanation: Radius = 1 ft. Volume of one circular pier = pi x r^2 x h = 3.14159 x (1^2) x 10 = 31.416 cu ft. Total volume for 16 piers = 16 x 31.416 = 502.65 cu ft. Convert to cubic yards: 502.65 / 27 = 18.62 cu yd, which rounds to 18.6 cu yd.

5A concrete wall is 120 feet long and 8 feet high. If formwork is required on both sides of the wall, what is the total contact surface area of formwork that must be estimated in square feet?

A.1,920 sq ft

B.1,440 sq ft

C.960 sq ft

D.2,400 sq ft

Explanation: The surface area of one face of the wall is 120 ft x 8 ft = 960 sq ft. Since forms are required on both sides, the total form contact area is 960 sq ft x 2 = 1,920 sq ft.

6A slab-on-grade requires welded wire reinforcement (WWR). The total floor area is 3,600 square feet. Each roll of wire mesh covers 750 square feet gross. Allowing a 10% overlap factor for side and end splices, how many full rolls of WWR must be purchased?

A.4 rolls

B.6 rolls

C.5 rolls

D.7 rolls

Explanation: Calculate required gross mesh area: 3,600 sq ft x 1.10 = 3,960 sq ft. Divide by roll coverage: 3,960 / 750 = 5.28 rolls. Since partial rolls cannot be purchased for full coverage, round up to 6 rolls.

7A concrete placement crew places concrete at a rate of 30 cubic yards per hour. The total pour volume is 120 cubic yards. If ready-mix trucks carry 10 cubic yards per load, how many truckloads are needed and at what interval should trucks arrive?

A.10 trucks spaced 15 minutes apart

B.12 trucks spaced 30 minutes apart

C.12 trucks spaced 20 minutes apart

D.15 trucks spaced 10 minutes apart

Explanation: Total trucks = 120 cu yd / 10 cu yd/truck = 12 trucks. The placement rate is 30 cu yd/hr, which equals 3 trucks per hour (60 minutes / 3 = 1 truck every 20 minutes).

8An under-slab vapor retarder is being installed over an 8,000 square foot subgrade. Each roll of polyolefin vapor barrier measures 12 feet by 100 feet (1,200 sq ft gross). Adding a 15% allowance for 6-inch laps and edge turn-ups, how many rolls are required?

A.6 rolls

B.7 rolls

C.9 rolls

D.8 rolls

Explanation: Gross area needed = 8,000 sq ft x 1.15 = 9,200 sq ft. Divide by roll area: 9,200 / 1,200 = 7.67 rolls. Rounding up to the next full roll requires 8 rolls.

9A concrete pad measuring 20 ft by 40 ft requires a single mat of #4 rebar spaced at 12 inches on center in both directions, with 3 inches of edge clearance. If rebar is purchased in standard 20-foot lengths and lap splices require 24 inches, how many 20-ft bars are needed for the transverse (20-ft) direction lines alone?

A.41 bars

B.21 bars

C.61 bars

D.82 bars

Explanation: Transverse bars run across the 20-ft width and are spaced along the 40-ft length. Length = 40 ft = 480 in. Subtracting 3 in clearance at both ends gives 474 in. Spacing at 12 in O.C.: (474 / 12) + 1 = 40.5 -> 41 lines of rebar. Since each line across the 20-ft width (minus edge clearances) requires exactly one 20-ft bar (or trimmed bar), 41 bars are needed.

10A concrete contractor must grout 500 cores in an 8-inch CMU foundation wall. Industry takeoff standards estimate that an 8-inch CMU core takes approximately 0.14 cubic feet of grout per vertical foot. If the wall is 8 feet high and all cores are filled solid, how many cubic yards of grout are required (net)?

A.1.2 cu yd

B.20.7 cu yd

C.2.6 cu yd

D.560 cu yd

Explanation: Grout volume per core = 8 ft x 0.14 cu ft/ft = 1.12 cu ft per core. For 500 cores: 500 x 1.12 = 560 cu ft. Convert to cubic yards: 560 / 27 = 20.74 cu yd, which rounds to 20.7 cu yd.

About the AZ ROC C-9 Concrete Exam

The Arizona ROC C-9/CR-9/R-9 Concrete Examination is a computer-delivered, open-book trade examination administered by PSI Services LLC for the Arizona Registrar of Contractors. The exam tests comprehensive concrete construction knowledge including volume and rebar estimating, site layout, excavation and subgrade preparation, formwork design and bracing per ACI 347, reinforcing steel placement and lap splicing, concrete mix design, placing, consolidation, finishing, jointing, curing per ACI 301/318, and OSHA 1926 Subpart Q concrete construction safety rules.

Questions

50 scored questions

Time Limit

120 minutes

Passing Score

70%

Exam Fee

$66 (Arizona ROC / PSI Services LLC)

AZ ROC C-9 Concrete Exam Content Outline

10%

Estimating

Concrete volume calculations, yardage estimation for slabs, footings, columns, and walls; waste factors, rebar weight calculations, formwork surface area, and material takeoff requirements.

20%

Layout and Excavation

Site surveying, batter boards, string lines, transit/laser levels, soil compaction, subgrade preparation, moisture barriers, vapor retarders, excavation sloping, benching, and grade checking.

12%

Formwork

ACI 347 form design, lateral pressure of fresh concrete, form release agents, wall ties, snap ties, form bracing, shoring, reshoring, slip forming, edge forms, and form removal timing.

14%

Reinforcing Steel

Rebar sizing (#3 through #18), ASTM grades, placement clearances, clear cover, lap splice lengths, mechanical couplers, welded wire reinforcement (WWR), tie wire methods, bar supports, and stirrups.

32%

General Concrete

Cement types (Type I-V), aggregate grading, water-cement ratio (w/c), slump testing, admixtures (accelerators, retarders, air-entraining, superplasticizers), placing, consolidation/vibration, finishing (floating, troweling, broom finish), joints (control, expansion, construction), curing methods, cold/hot weather concreting, ACI 301, and ACI 318 code standards.

12%

Safety

OSHA 29 CFR 1926 Subpart Q (Concrete and Masonry Construction), rebar impalement protection (caps), fall protection, silica safety (Table 1 respiratory protection), trenching safety (Subpart P), PPE, and lockout/tagout.

How to Pass the AZ ROC C-9 Concrete Exam

What You Need to Know

Passing score: 70%
Exam length: 50 questions
Time limit: 120 minutes
Exam fee: $66

Keys to Passing

Work through all 100 available questions
Review every answer and explanation
Track weak areas and revisit them
Use our AI tutor for tough concepts

AZ ROC C-9 Concrete Study Tips from Top Performers

1Practice concrete volume math: remember length (ft) x width (ft) x depth (ft) divided by 27 gives cubic yards. Always add 5% to 10% waste for slabs and footings on unlevel ground.

2Master ACI 318 clear cover rules: 3 inches for concrete cast against earth, 1-1/2 to 2 inches for weather-exposed concrete, and 3/4 inch for interior slabs/walls.

3Understand slump testing steps per ASTM C143: filling the 12-inch cone in three equal-volume layers, rodding each layer 25 times with a 5/8-inch tamping rod, lifting straight up in 5 +/- 2 seconds, and measuring slump to the nearest 1/4 inch.

4Memorize OSHA 1926 Subpart Q rules: mandatory impalement protection for all exposed vertical rebar, prohibition of employees standing under elevated concrete buckets, and silica dust controls under Table 1.

5Review formwork design principles per ACI 347: rate of placement, concrete temperature, and slump impact on maximum lateral fluid pressure.

Frequently Asked Questions

How many questions are on the official Arizona ROC C-9 Concrete exam?

The official PSI C-9/CR-9/R-9 Concrete exam contains 50 scored multiple-choice questions. Candidates are allotted 120 minutes to complete the test.

What passing score is required for the AZ ROC C-9 exam?

A minimum passing score of 70% (35 correct out of 50 questions) is required to pass the trade exam.

Is the Arizona ROC C-9 Concrete exam open book?

Yes, the examination is open-book. Approved references (such as ACI 318, ACI 301, Design and Control of Concrete Mixtures, Formwork for Concrete ACI SP-4, and OSHA 29 CFR 1926) may be brought into the PSI test center.

What topics carry the highest weight on the exam?

General Concrete carries the highest weight at 32% (16 questions), followed by Layout and Excavation at 20% (10 questions) and Reinforcing Steel at 14% (7 questions).

Where can I schedule the AZ ROC C-9 Concrete exam?

Examinations are scheduled online through PSI Services LLC at https://test-takers.psiexams.com/azcon or by phone with PSI candidate services.

100+ Free AZ ROC C-9 Concrete Practice Questions

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