- The Name Change and What This Credential Covers
- How the Written and Performance Exams Fit Together
- The Ten Knowledge Areas at a Glance
- Domains 1 and 2: Concrete Technology and Equipment
- Domains 3 and 4: Environment and Surface Preparation
- Domain 5: Placement Principles and Techniques
- Domains 6 and 8: Communication and Safety
- Domains 7, 9 and 10: Finishing, Testing and Curing
- How the Practical Is Graded: The Five-Core Rule
- A Domain-Ordered Study Sequence
- Experience Hours, Renewal and Budgeting
- Frequently Asked Questions
- ACI lists ten required knowledge areas for the dry-mix credential, now officially titled Shotcreter (Dry-Mix Process), but they are unweighted.
- The written exam is closed-book, runs 90 minutes, has 60-90 questions, and requires 75% to pass.
- The practical fails if any core grades above 3 or more than two cores receive grade 3.
- Full certification needs 500 verified hours, including at least 200 of direct hand-nozzling.
The Name Change and What This Credential Covers
If you searched for "ACI shotcrete nozzleman certification," you are in the right place, but the terminology has shifted. The American Concrete Institute (ACI) has renamed the credential Shotcreter (Dry-Mix Process). Industry publications, including the American Shotcrete Association (ASA) and a Fourth Quarter 2025 Shotcrete magazine profile of the first female ACI certified nozzleman, reflect the nozzleman-to-shotcreter transition. This site retains the legacy "nozzleman" wording because that is still how many crews, job postings and search queries describe the role.
Scope matters here. This guide covers the full dry-mix credential. It is not wet-mix certification, and it is not the Shotcreter-in-Training level. In the dry-mix process, the cementitious mix and aggregate are conveyed pneumatically as a dry or predampened stream, and water is added at the nozzle. That single fact explains why the nozzleman controls so much of the final quality, and why many exam topics orbit around water control. For a broader orientation, see What Is Shotcrete Nozzleman (Dry-Mix) Certification?
How the Written and Performance Exams Fit Together
Candidates often prepare for one exam when there are really three assessment pieces. Understanding the layout prevents surprises on test day.
| Component | Format | Pass Standard |
|---|---|---|
| Written examination | Closed-book, 60-90 questions, 90 minutes; multiple-choice (policy also allows true/false items) | 75% |
| Performance Part I | Closed-book, vertical dry-mix placement (overhead is an additional orientation) | At least 75% on the workmanship checklist |
| Performance Part II | Evaluation of five cores | Fails if any core is graded above 3, or more than two cores receive grade 3 |
The written exam and both performance parts must be completed within one year. ACI's policy permits a range of 60-90 questions rather than a single fixed count, so avoid any resource claiming one exact number. For how those standards translate into a target score, read Shotcrete Nozzleman (Dry-Mix) Passing Score 2026, and for the scheduling side, Exam Dates, Testing Windows and Deadlines.
The Ten Knowledge Areas at a Glance
ACI's public program page lists ten required knowledge areas, and the April 25, 2025 Job-Task Analysis for ACI Certification of Shotcreter supports them as examination objectives. Critically, ACI does not publish percentage weights for these areas, so any site quoting "Domain 5 is 30% of the exam" is inventing numbers. Treat all ten as testable.
- Basic concrete technology
- Shotcrete Equipment
- Environmental conditions and precautions
- Inspection and preparation of surfaces
- Shotcrete placement, principles, and techniques
- Communication
- Finishing and tolerance controls
- Safety
- Testing/quality
- Curing
The sections below group related domains and spell out the concrete topics worth mastering. Compare this breakdown with the companion exam domains overview if you want a second framing.
Domains 1 and 2: Concrete Technology and Equipment
Domain 1: Basic concrete technology
Even though you are spraying rather than pouring, the material science is the same, and the exam expects fluency with it.
- Role of cement, aggregate gradation, admixtures and supplementary materials in a dry-mix batch
- Why water-to-cementitious ratio governs strength and durability, and how dry-mix water addition at the nozzle changes your responsibility for it
- Effects of moisture in the predampened mix on hydration and on conveying behavior
- Basic properties of hardened shotcrete: strength, density, permeability, bond
Domain 2: Shotcrete Equipment
Dry-mix equipment is a system, and the written exam tests whether you understand how each piece affects the stream reaching the wall.
- Delivery equipment, hoses, and the nozzle assembly, including the water ring where water enters the stream
- Air supply: adequate, steady air volume and pressure support consistent velocity and compaction
- Routine inspection, cleaning and wear checks, and how worn components show up as inconsistent output
- Recognizing equipment symptoms (pulsing, plugging, uneven water) and the correct response
Domains 3 and 4: Environment and Surface Preparation
Domain 3: Environmental conditions and precautions
Weather and ambient conditions change how shotcrete behaves, and candidates are expected to anticipate them.
- Hot, cold, windy and wet conditions and the precautions each requires
- Protection of freshly placed material from freezing, rapid drying and washout
- Recognizing when conditions are unsuitable to proceed
Domain 4: Inspection and preparation of surfaces
Bond begins before the first pass of the nozzle.
- Substrate inspection: cleanliness, soundness, loose or contaminated material, and appropriate surface moisture condition
- Preparation of existing concrete, rock or forms to receive shotcrete
- Reinforcement and embedded items: verifying position, cleanliness and support before placement
- Setting up grounds, screeds and guides that define thickness and line
These two domains reward candidates who think like a field supervisor, not just an operator. Questions in this territory usually present a scenario and ask what you should check or do before proceeding.
Domain 5: Placement Principles and Techniques
This is the heart of both the written exam and the practical. It is also where dry-mix differs most visibly from wet-mix, which is why a candidate choosing a path should read the dry-mix versus wet-mix certification discussion and then commit to the process they actually work in.
Domain 5: Shotcrete placement, principles, and techniques
Know the physics of the stream and the habits that produce dense, well-bonded material.
- Nozzle distance and angle: keeping the stream generally perpendicular to the receiving surface for compaction
- Controlling water at the nozzle so the material is neither dry and dusty nor sloughing
- Rebound and overspray: what they are, where they accumulate, and why rebound must never be reworked into the placement
- Encapsulating reinforcing bars fully, and recognizing voids and shadowing behind bars
- Building thickness in layers, working in a pattern, and managing corners and edges
- Differences between vertical and overhead placement; the performance exam requires vertical, and overhead is an additional certification orientation
Domains 6 and 8: Communication and Safety
Domain 6: Communication
A shotcrete crew works at a distance, with noise and obstructed sightlines, so communication is a genuine technical skill.
- Standard signals between nozzleman, equipment operator and other crew members
- Procedures for starting, stopping and emergency shutdown
- Reporting problems (equipment, material, or surface issues) to the right person promptly
Domain 8: Safety
Safety questions are usually the most straightforward on the written exam, and the most costly to get wrong on a job.
- Personal protective equipment appropriate to pressurized conveying, dust and cementitious exposure
- Hazards of pressurized hoses, including whip and blockage clearing
- Dust, silica and air-quality awareness in enclosed or underground settings
- Safe access, scaffolding, and work near overhead or unstable ground
Domains 7, 9 and 10: Finishing, Testing and Curing
Domain 7: Finishing and tolerance controls
What you do after placement determines the final appearance and conformance.
- Screeding, trimming and the timing of finishing operations relative to set
- Finish types and when each is appropriate
- Verifying thickness, line and surface tolerances against project requirements
Domain 9: Testing/quality
The nozzleman is often the first line of quality control.
- Purpose of test panels and cores, and how they evaluate the placed material
- Recognizing defects such as sand pockets, laminations, voids and poor bond
- Documenting and responding to nonconforming work
Domain 10: Curing
Curing is easy to underweight in your studying because it comes last, but ten domains means ten domains.
- Why moisture retention and temperature control in the early period protect strength and limit cracking
- Curing methods and protecting fresh surfaces from drying winds and sun
- How environmental precautions from Domain 3 connect to curing decisions
How the Practical Is Graded: The Five-Core Rule
Many candidates misstate the Part II rule, so here it is exactly. Five cores are evaluated and graded. You fail if any single core is graded above 3, or if more than two cores receive grade 3. That means up to two cores at grade 3 is survivable, but a third grade-3 core is not, and no core may exceed grade 3. Part I is separate: you need at least 75% on the workmanship checklist.
Key Takeaway
Coring converts your habits into evidence. Voids behind bars, wet-sloughed layers and trapped rebound all show up in cores, which is why the written domains on water control, encapsulation and rebound are not separate from the practical. They are the same skills tested twice.
For a candid look at how demanding the whole process is, see How Hard Is the Shotcrete Nozzleman (Dry-Mix) Exam?. For what published data can and cannot tell you, read the pass rate analysis.
A Domain-Ordered Study Sequence
Because the domains are unweighted, spread effort across all ten while front-loading the ones that feed the practical. Here is one way to sequence an eight-week plan around the material rather than around generic habits.
Foundations: Domains 1 and 2
- Concrete technology vocabulary and the role of water
- Equipment components and symptom-to-cause pairings
Site and technique: Domains 3, 4 and 5
- Environmental precautions and surface preparation checklists
- Placement principles, rebound, and reinforcement encapsulation
Process and people: Domains 6, 7 and 8
- Signals, shutdown procedure and safety hazards
- Finishing sequence and tolerance verification
Quality and closeout: Domains 9 and 10, then full review
- Testing, defect recognition and curing methods
- Timed practice sets and explanations for every miss
Candidates preparing for the written exam can use the practice test to rehearse the closed-book, 90-minute pacing, and the full study guide expands on resources. Be cautious with marketplace "answer sets" from document-sharing sites: they are not authenticated examination material, and original questions with explanations teach the reasoning the exam actually rewards. The official reference for coursework is the CP-60 Shotcreter Craftsman Workbook (fourth edition, with English and Spanish versions), which links to CCS-4, Shotcrete for the Craftsman. A one-page refresher is available in the cheat sheet.
Experience Hours, Renewal and Budgeting
Full certification versus trainee
ACI imposes no specific education prerequisite. What it requires is verified experience. Full certification calls for 500 verified hours as a shotcreter, including at least 100 hours in each process and orientation sought and at least 200 hours of direct hand-nozzling. Do not read that as 500 hours of hand-nozzling; the 200-hour figure is the nozzling floor within the total. Trainee certification requires at least 25 verified hand-nozzling hours in the process and is vertical-only. Adding 475 qualifying hours can upgrade a trainee credential, but only for the remainder of the original certification term. The full eligibility picture is in Requirements, Prerequisites and How to Qualify.
| Feature | Trainee | Full Certification |
|---|---|---|
| Verified hours | At least 25 hand-nozzling hours in the process | 500 total, with 200+ direct hand-nozzling and 100+ per process/orientation |
| Orientation | Vertical only | Vertical, plus overhead if sought |
| Term | Upgrade holds only for remainder of original term | Five years |
Renewal and the ACI/ASA discrepancy
Certification lasts five years. Renewal requires the then-current written and performance examinations plus applicable experience, or an eligible structured-interview-plus-performance route. For the interview route, ACI requires prior certification in the same process issued within six years and at least 500 work hours in the preceding two years, including 100 in each process and orientation sought.
Budgeting by component
ASA's December 2024 fee schedule lists charges as components, not an all-inclusive candidate price. In USD, ASA-member/non-member rates are: written examination $250/$360 per person; vertical performance examination $120/$160; additional overhead performance examination $120/$160; session setup $800/$950; session day $2,850/$3,550; study materials $70/$110. Session, equipment, materials, coring and other costs must be budgeted separately, and a sponsor's actual invoice may differ. Work through the details in Certification Cost: Complete Pricing Breakdown. On the earnings side, a certification-specific pay premium is not established by the sources behind this guide, so local job-market evidence matters more; see the salary guide, the ROI analysis and the overview of who hires dry-mix shotcreters.
Frequently Asked Questions
No. ACI's program page lists ten required knowledge areas without percentage weights, and the 2025 Job-Task Analysis supports them as exam objectives. Prepare for all ten rather than relying on invented weightings.
75%. The exam is closed-book, allows 90 minutes, and contains between 60 and 90 questions depending on the exam form. Items may be multiple-choice or true/false.
Part I requires at least 75% on the workmanship checklist. In Part II, five cores are graded, and you fail if any core is above grade 3 or more than two cores receive grade 3.
No. You need 500 verified hours as a shotcreter, including at least 100 in each process and orientation sought and at least 200 hours of direct hand-nozzling.
The current official ACI title is Shotcreter (Dry-Mix Process). The nozzleman name is the legacy label still widely used by crews and searchers, and this guide treats them as the same dry-mix credential.