What Is A Shotcrete Nozzleman (Dry-Mix)?

The Short Answer: What a Dry-Mix Nozzleman Does

A shotcrete nozzleman is the crew member who holds the nozzle and physically directs the material onto the receiving surface. In the dry-mix process, the cement and aggregate travel through the hose in a relatively dry state, and water is introduced at the nozzle. That single fact shapes almost everything about the job: the nozzleman controls the water, the water-cement ratio is adjusted on the fly, and the quality of the in-place concrete depends heavily on that person's judgment and technique.

The credential discussed on this page is the ACI Shotcrete Nozzleman (Dry-Mix Process) certification, issued by the American Concrete Institute International (ACI). It is a certification of demonstrated knowledge and skill, not a degree or a short course. A candidate must pass a written examination, pass a hands-on performance examination, and document verified work experience.

Nozzleman vs. Shotcreter: The Name Change

If you search for this credential, you will run into two names. "ACI Shotcrete Nozzleman (Dry-Mix Process)" is the legacy title that many contractors, job postings, and study materials still use. ACI's current official title is Shotcreter (Dry-Mix Process). Industry publications from the American Shotcrete Association (ASA) have noted the transition, including a 2025 magazine feature on the first female ACI-certified nozzleman that corroborates the nozzleman-to-shotcreter rename.

For practical purposes, treat the two names as the same credential. When you register, read the sponsor's current paperwork, which will likely use "Shotcreter." When you talk to a foreman or read a job ad, you may still hear "nozzleman." Neither term changes what you are tested on.

If you are still sorting out the terminology, these companion pages cover the same ground from different angles: What Does Shotcrete Nozzleman (Dry-Mix) Stand For? and Shotcrete Nozzleman (Dry-Mix) Meaning.

Why "Dry-Mix" Is Its Own Credential

ACI certifies shotcreters by process. Dry-mix and wet-mix are different placement methods with different equipment, different failure modes, and different skills. A dry-mix certification does not automatically cover wet-mix work, and experience hours are counted per process.

If you are weighing which path fits your work, the Shotcrete Nozzleman (Dry-Mix) Jobs overview explains where dry-mix skills are typically in demand. Choose the process you actually work in, because the hour requirements are tied to it.

What the Work Actually Looks Like

Dry-mix shotcrete is used for repair and rehabilitation, slope and excavation support, tunnel and mine linings, and other placements where a mobile, compact system is useful. The nozzleman rarely works alone; they depend on a crew handling the material feed, the compressed air, the hoses, and the surface preparation.

What distinguishes a certified nozzleman is not strength but control. The role demands judgment about:

• Water at the nozzle: too little produces dusty, poorly hydrated material; too much causes sloughing and sagging.
• Nozzle position and angle: typically the nozzle is held perpendicular to the receiving surface at an appropriate distance, with a controlled motion pattern.
• Reinforcement encapsulation: placing material so it fully surrounds bars and avoids voids or shadowing behind them.
• Rebound and overspray: recognizing and removing rebound so it does not become trapped in the work.
• Communication: coordinating with the crew, often over noise, using agreed signals.

The Ten Knowledge Areas on the Written Exam

ACI publishes the required knowledge areas for the credential. There are ten, and they are listed here as headings only. ACI does not publish a percentage weighting for them, so we do not assign one. For a deeper walk-through, see our Shotcrete Nozzleman (Dry-Mix) Exam Domains guide.

Written Exam vs. Performance Exam

Candidates often assume "the exam" is one event. For this credential it is not. There is a written examination and a two-part performance examination, and all of it must be completed within one year.

The written examination

• Format: closed-book
• Length: between 60 and 90 questions, in 90 minutes (ACI's policy gives a range rather than a single fixed count)
• Passing score: 75%
• Question style: ASA's program page describes multiple-choice items, while the ACI policy allows true/false or multiple-choice
• Delivery: through ACI-approved sponsoring groups and examiners; ASA's program page also lists a Prometric option for the English written exam

For the exact scoring threshold and how it is applied, read the passing score breakdown. To practice in the style of the written exam, our dry-mix practice test uses original, explained questions rather than reproduced exam items.

The performance examination

The performance exam is also closed-book and has two parts:

1. Part I, workmanship checklist: you must score at least 75% on the checklist while placing material.
2. Part II, core evaluation: five cores are evaluated. You fail Part II if any single core is graded above 3, or if more than two cores receive a grade of 3.

Read that core rule carefully, because it is commonly misremembered. A grade of 3 is not an automatic failure on its own; two cores at grade 3 can still be acceptable. The failing conditions are any core worse than 3 or three or more cores at 3.

The performance exam requires vertical dry-mix placement. Overhead placement is an additional certification orientation, which you can add if your work requires it.

Experience Hours: Full Certification vs. Trainee

ACI imposes no specific education prerequisite, but it does require verified work experience. This is the area where candidates most often misread the rules.

Do not read "500 hours" as 500 hours of hand-nozzling. The 500 hours are work experience as a shotcreter, of which at least 200 must be direct hand-nozzling. The trainee level is a stepping stone, not a shortcut to the full credential, and it carries a limit on what it can be upgraded into.

For the complete eligibility picture, see Shotcrete Nozzleman (Dry-Mix) Requirements.

Who Issues, Who Tests, and What Costs Money

It helps to separate three roles that are easy to blur together:

• ACI is the governing body and credential issuer.
• ACI-approved sponsoring groups and examiners deliver the testing.
• ASA is a delivery sponsor, not the issuer. It also sets its own sponsor-level requirements, including education and refresher training for initial certification and recertification, with stated exceptions for retests and for adding an orientation.

Budget by components, not a single fee

There is no single all-inclusive national candidate fee. ASA's December 2024 fee schedule lists separate component charges, shown here as ASA member / non-member in USD:

These are components, not a total. Session setup and session day charges apply to a testing session as a whole, and coring, equipment, and materials also have to be budgeted. What a given candidate pays depends on the sponsor, how the session is organized, and who covers the costs, which is often the employer. Our certification cost breakdown shows how to assemble these pieces.

Study materials

The current program links the fourth-edition CP-60 Shotcreter Craftsman Workbook, available in English and Spanish, which includes CCS-4, Shotcrete for the Craftsman. This is the primary courseware, and we do not claim to reproduce it. Use it as your core text, and supplement it with practice questions that explain their reasoning.

Five-Year Term and Renewal

Certification lasts five years. Renewal is not automatic, and there are two routes:

1. Re-examination: the then-current written and performance examinations, plus applicable experience requirements.
2. Structured interview plus performance examination: available to eligible candidates. 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.

For timing questions, see exam dates and scheduling.

A Sensible Order for Preparing

Generic study advice is plentiful. What is specific to this credential is the sequencing, because the ten knowledge areas build on each other. One workable order:

The full approach, including how to handle weaker domains, is in our study guide, and the cheat sheet works as a last-pass review. When you are ready to test your recall, use the practice questions and read the explanations, not only the answers.

Frequently Asked Questions

In short, a dry-mix nozzleman is a skilled tradesperson whose competence ACI verifies through a closed-book written exam, a hands-on performance exam, and documented hours. Understanding that structure before you start is the best first step. For related background, see Shotcrete Nozzleman (Dry-Mix) Training and whether the certification is worth it.