100+ Free ACI Dry-Mix Nozzleman Practice Questions

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In the dry-mix shotcrete process, at what point is water introduced to the mix?

At the batching plant before the material enters the hose

At the nozzle by the nozzleman using a water ring

In the material hose midway between the gun and the nozzle

Water is not required because the cement hydrates from atmospheric moisture

to track

2026 Statistics

Key Facts: ACI Dry-Mix Nozzleman Exam

500 hrs

Nozzleman Experience

ACI Cert Policies §1.03

60-90

Written Questions

ACI Cert Policies §2.06

75%

Passing Score (written & Part I)

ACI Cert Policies §2.09

90 min

Written Time Limit

ACI Cert Policies §2.07

5 years

Certification Validity

ACI Cert Policies §1.05

15-30%

Typical Dry-Mix Rebound

ACI CCS-4

The ACI Shotcrete Nozzleman Dry-Mix certification follows ACI Certification Policies last revised July 2015. It requires 500 documented hours of nozzleman experience (100 in dry-mix vertical), a written exam of 60 to 90 questions with 75% passing in 90 minutes, and a two-part performance exam on a vertical test panel. Nozzleman-in-Training is available with only 25 hours of experience but is capped at vertical orientation. The certification is valid for 5 years and is based on ACI CCS-4 Shotcrete for the Craftsman. Dry-mix is the process where water is added at the nozzle — this water control skill is the defining competency evaluated on the panel.

Sample ACI Dry-Mix Nozzleman Practice Questions

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

1In the dry-mix shotcrete process, at what point is water introduced to the mix?

A.At the batching plant before the material enters the hose

B.At the nozzle by the nozzleman using a water ring

C.In the material hose midway between the gun and the nozzle

D.Water is not required because the cement hydrates from atmospheric moisture

Explanation: Dry-mix shotcrete (often called gunite) conveys dry cement and aggregate pneumatically through the hose. Water is added at the nozzle through a water ring, and the nozzleman controls the flow with a valve. This is the defining difference from wet-mix, where the concrete is pumped to the nozzle already mixed with water.

2Which ACI document is the written exam for Shotcrete Nozzleman certification derived from?

A.ACI 318 Building Code Requirements for Structural Concrete

B.ACI 301 Specifications for Structural Concrete

C.ACI CCS-4 Shotcrete for the Craftsman

D.ACI 211 Standard Practice for Selecting Proportions

Explanation: ACI Certification Policies for Shotcrete Nozzlemen section 2.01 states the written and performance examinations are derived from ACI CCS-4 Shotcrete for the Craftsman. That reference is the core study document for the credential.

3How many hours of verified nozzleman work experience does ACI require for full Shotcrete Nozzleman certification?

A.100 hours

B.250 hours

C.500 hours

D.1,000 hours

Explanation: ACI Certification Policies section 1.03 requires 500 hours of verified work experience as a nozzleman, with at least 100 hours in the process and orientation for which certification is sought. The hours are documented on an ACI Work Experience Form and signed by the employer.

4For the full Nozzleman certification, how many of the 500 hours must be in the specific process and orientation sought?

A.25 hours

B.50 hours

C.100 hours

D.200 hours

Explanation: ACI requires at least 100 of the 500 hours of verified experience to be in the process (wet-mix or dry-mix) and orientation (vertical or overhead) for which certification is sought. Dry-mix vertical experience cannot be substituted for wet-mix overhead.

5How long does a Shotcrete Nozzleman certification remain valid after successful examination?

A.1 year

B.3 years

C.5 years

D.10 years

Explanation: ACI Certification Policies section 1.05 states that upon successful completion of both the written and performance exams, the applicant is certified for a period of 5 years. Recertification is required to continue holding the credential.

6According to ACI Certification Policies, how many questions may the dry-mix written exam contain?

A.20 to 40 questions

B.50 to 75 questions

C.60 to 90 questions

D.100 to 150 questions

Explanation: Section 2.06 of the ACI Certification Policies specifies that the entire written examination for either wet-mix or dry-mix consists of 60 to 90 questions, and they may be true/false or multiple-choice format.

7What is the minimum passing score on the ACI Shotcrete Nozzleman written examination?

A.60%

B.70%

C.75%

D.80%

Explanation: ACI Certification Policies section 2.09 sets the passing grade at 75% or higher on the written examination. The same 75% threshold applies to the Part I performance checklist workmanship grade.

8How much time is allotted to complete the dry-mix written examination?

A.30 minutes

B.60 minutes

C.90 minutes

D.Unlimited — the candidate takes as long as needed

Explanation: Per section 2.07 of the ACI Certification Policies, a maximum of 90 minutes shall be permitted for completion of either the wet-mix or the dry-mix written examination, with additional time allowed for oral administration in special cases.

9Is the ACI Shotcrete Nozzleman written examination open-book or closed-book?

A.Open-book; candidates may bring ACI CCS-4 and notes

B.Closed-book; notes and technical materials are prohibited in the exam area

C.Partially open-book; only the ACI Certification Policy may be referenced

D.Open-book for nozzleman-in-training only

Explanation: ACI Certification Policies section 2.02 states that all written and performance examinations are closed book and that notes or other technical materials shall not be permitted in the examination area.

10What are the two parts of the ACI Shotcrete Nozzleman performance examination?

A.A written safety quiz and a timed material batching test

B.Part I — workmanship checklist during shooting; Part II — destructive grading of cores from the test panel

C.Overhead and vertical panel shoots

D.Wet-mix and dry-mix panel shoots back to back

Explanation: Per sections 2.18 through 2.22 of the ACI Certification Policies, the performance exam is evaluated in two parts. Part I is the workmanship checklist observed by the examiner during shooting. Part II is destructive grading of five cores cut from the cured test panel to evaluate the soundness of the shotcrete.

About the ACI Dry-Mix Nozzleman Exam

The ACI Shotcrete Nozzleman (Dry-Mix Process) credential is a hands-on certification for the craft worker who shoots dry-mix shotcrete — cement and aggregate blown through a hose by compressed air, with water added at the nozzle by the nozzleman. The credential requires 500 hours of documented nozzleman experience with at least 100 hours in the specific process and orientation sought, a closed-book written exam based on ACI CCS-4 Shotcrete for the Craftsman, and a two-part performance exam on a vertical test panel that is later cored and graded for soundness.

Assessment

Written exam of 60-90 true/false and multiple-choice questions in 90 minutes, plus a two-part hands-on performance examination shot on a vertical test panel (overhead is optional add-on). Part I is the workmanship checklist graded in the field; Part II is destructive grading of five cores cut from the cured panel.

Time Limit

90 min written plus a half to full day hands-on session

Passing Score

75% written; 75% Part I performance checklist; no single core above grade 3 and no more than two cores at grade 3 on Part II

Exam Fee

Typically $700-$1,500 through a Sponsoring Group (American Concrete Institute (ACI) with American Shotcrete Association (ASA))

ACI Dry-Mix Nozzleman Exam Content Outline

18%

Dry-Mix Process Fundamentals

Differences between dry-mix and wet-mix, water added at the nozzle, pneumatic conveyance, higher rebound characteristics, applications in repair, pools, and overhead work.

16%

Equipment and Air/Water Supply

Rotary barrel and continuous feed guns, compressor sizing (approximately 250-375 cfm), material hose sizing, water ring and water valve at the nozzle, and blow pipe use.

14%

Materials and Mix Design

Pre-bagged versus site-batched dry materials, aggregate gradation and moisture, cement types, accelerators for overhead, and avoiding flash set and material segregation in the hose.

18%

Nozzleman Technique and Water Control

Reading the gloss or sheen of the receiving surface, nozzle distance 3 to 6 feet, nozzle angle perpendicular to the work, encapsulation of reinforcing steel, and avoiding sand pockets and sloughing.

12%

Rebound, Overspray, and Panel Placement

Typical 15 to 30% rebound on vertical work and higher rebound overhead, why rebound is discarded and never reused, shooting from corners outward, and layering thickness before sloughing.

10%

Quality Control, Test Panels, and Cores

Shooting ACI test panels per ACI 506.2 and ASTM C1140, core grading 1 to 5, acceptable core criteria, and the voids, laminations, and sand lenses that cause failures.

12%

Safety, PPE, and Silica

OSHA 29 CFR 1926 Subpart Q shotcrete safety, respirable crystalline silica exposure per 29 CFR 1926.1153 (dry-mix carries a higher dust exposure than wet-mix), required respirator, eye, and hearing protection, and hose whip precautions.

How to Pass the ACI Dry-Mix Nozzleman Exam

What You Need to Know

Passing score: 75% written; 75% Part I performance checklist; no single core above grade 3 and no more than two cores at grade 3 on Part II
Assessment: Written exam of 60-90 true/false and multiple-choice questions in 90 minutes, plus a two-part hands-on performance examination shot on a vertical test panel (overhead is optional add-on). Part I is the workmanship checklist graded in the field; Part II is destructive grading of five cores cut from the cured panel.
Time limit: 90 min written plus a half to full day hands-on session
Exam fee: Typically $700-$1,500 through a Sponsoring Group

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 Dry-Mix Nozzleman Study Tips from Top Performers

1Master water-at-the-nozzle judgment. Dry-mix shotcrete is pass or fail at the water valve: too little water yields sand pockets and dry lenses, too much water slumps and sloughs. Learn the gloss or sheen visual cue before you test.

2Memorize ACI Certification Policy numbers. 500 hours, 100 in process, 60-90 written questions, 75% passing, 90-minute limit, 5-year validity, and the core-grading rule — no single core above grade 3 and no more than two cores at grade 3.

3Study rebound percentages by orientation. Expect 15-30% on vertical dry-mix, higher overhead, and always remove rather than reuse the rebound.

4Know the equipment flow. Rotary gun or continuous feed gun, material hose, water ring at nozzle, water valve, blow pipe, compressor at 250-375 cfm — be able to describe the full system and what can go wrong at each stage.

5Read ACI CCS-4 Shotcrete for the Craftsman at least once. The written exam is drawn directly from it.

6Drill the silica rule. OSHA 29 CFR 1926.1153 PEL is 50 μg/m³ respirable crystalline silica — dry-mix has higher exposure than wet-mix and always needs a written exposure control plan.

7Practice the pre-shooting checklist. Panel bracing, form adequacy, rebar encapsulation, mix delivery, air pressure, water valve test shot, and PPE — examiners score workmanship from the first minute of the session.

Frequently Asked Questions

Is the ACI Shotcrete Nozzleman exam written, hands-on, or both?

Both. ACI Certification Policies require a closed-book written exam of 60 to 90 questions (75% passing, 90 minutes) plus a two-part performance exam on a vertical test panel. Part I is the workmanship checklist graded in the field and Part II is destructive grading of five cores cut from the cured panel.

How many hours of experience do I need for the Dry-Mix certification?

500 hours of verified work experience as a nozzleman, with at least 100 hours in the process and orientation sought — for example, 100 hours on dry-mix vertical. Experience is documented on an ACI Work Experience Form and signed by the employer. Nozzleman-in-Training is available with only 25 hours, but it is capped at vertical orientation and requires an ACI-certified nozzleman to be present during the performance exam.

What is the key difference between dry-mix and wet-mix shotcrete?

In dry-mix (sometimes called gunite) the cement and aggregate are conveyed through the hose by compressed air and water is added at the nozzle by the nozzleman, who controls the water volume in real time by watching the gloss of the surface. In wet-mix the ready concrete is pumped to the nozzle and compressed air is added there to throw the material. Dry-mix depends far more on nozzleman skill because the water-cement ratio is set at the nozzle rather than at the batcher.

How much rebound is normal for dry-mix shotcrete?

On vertical surfaces, dry-mix rebound is typically 15 to 30% of the material shot. Overhead work can reach 25 to 50% rebound. Dry-mix rebound is always higher than wet-mix because of the pneumatic conveyance. Rebound material must be removed from the working area and never incorporated into the shotcrete — reusing rebound introduces weak inclusions and lowers strength.

How long is the ACI Shotcrete Nozzleman certification valid?

Five years. Recertification requires either retaking the full written and performance examinations, or — if at least 1,000 hours of documented nozzleman work (with 200 hours in the process sought in the last two years) can be shown and recertification is pursued within 6 years of the prior certification — a structured interview in lieu of the written exam plus the full performance examination.

Is the written exam open-book or closed-book?

Closed-book. Per ACI Certification Policies section 2.02, no notes or technical materials are allowed in the examination area. The written exam content is derived from ACI CCS-4 Shotcrete for the Craftsman and covers both dry-mix and wet-mix fundamentals plus process-specific knowledge.

Why does dry-mix have higher silica exposure than wet-mix?

Dry-mix conveys dry cement and aggregate pneumatically, creating airborne dust at the nozzle, at material transfer points, and during cleanup. Wet-mix moves pre-wetted concrete, which largely suppresses the dust. OSHA 29 CFR 1926.1153 sets a respirable crystalline silica PEL of 50 μg/m³, and dry-mix operations almost always require fit-tested respirators, engineering controls, and a written exposure control plan.