What Is Shotcrete Nozzleman (Dry-Mix)?

What the Credential Is: A Legacy Name and a Current Title

If you search for "ACI shotcrete nozzleman certification," you are looking for a credential that now carries a different official title. The American Concrete Institute (ACI) renamed the program, and the current title is Shotcreter (Dry-Mix Process). The older name, Shotcrete Nozzleman (Dry-Mix Process), remains in wide use across job postings, training catalogs, and crew conversations, so this site keeps that legacy name while making clear that both names point to the same dry-mix credential.

The transition is documented in public industry sources. The American Shotcrete Association (ASA) discussed the naming change in its June 2025 newsletter, and the Fourth Quarter 2025 issue of Shotcrete magazine carried a feature on the first female ACI certified nozzleman that explicitly corroborates the nozzleman-to-shotcreter rename. When you see either label on a resume, a job ad, or a registration form, treat them as the same program.

For a broader look at what the certification means for your career, see our overview of Shotcrete Nozzleman (Dry-Mix) certification, and for naming questions specifically, what Shotcrete Nozzleman (Dry-Mix) means.

Who Issues It and Who Delivers the Testing

ACI is the governing body and credential issuer. Testing, however, is run through ACI-approved sponsoring groups and examiners rather than a single national test center. ASA is one such delivery sponsor, but it is a sponsor, not the issuer. That distinction matters because some rules, such as fees, session logistics, required refresher education, and renewal waivers, are set by the sponsor, while the core certification requirements are set by ACI.

ASA's program page also lists a Prometric option for the English written examination. The practical (performance) examination is separate and is not delivered through Prometric. Plan on the written and practical components being scheduled as different events.

The policy document governing all of this is ACI CPP 660.1-24, ACI Certification Program Policy: Shotcreter and Shotcreter-In-Training, revised March 5, 2024. Exam content is supported by the Job-Task Analysis (JTA) for ACI Certification of Shotcreter, approved April 25, 2025. For scheduling windows and deadlines, see our guide to Shotcrete Nozzleman (Dry-Mix) exam dates.

Why Dry-Mix Is Its Own Credential

In dry-mix shotcrete, the cement and aggregate are conveyed through the hose as a dry or damp mixture, and water is introduced at the nozzle. That single fact changes the craft. In the wet-mix process, the mix arrives already hydrated and the nozzleman's control is mostly about air, velocity, and placement. In the dry-mix process, the nozzleman is the one metering the water, which means water control is a hands-on, real-time judgment call tied directly to quality, rebound, and strength.

This is why preparation for the dry-mix credential cannot be borrowed from wet-mix material. For a side-by-side look at choosing a path, see the World of Shotcrete article on dry-mix versus wet-mix certification, and keep your own study focused on dry-mix practice.

The Two Examinations: Written and Performance

Full certification requires passing both 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: 60 to 90 questions in 90 minutes. The policy gives a range rather than one fixed number, so do not expect a specific question count in advance.
• Passing score: 75%
• Item style: ASA's program page describes multiple-choice questions, while the ACI policy permits true/false or multiple-choice items. Prepare for both.

For the exact cut-off and what it means in practice, see Shotcrete Nozzleman (Dry-Mix) passing score.

The performance examination

The performance exam is also closed-book and requires vertical dry-mix placement. Overhead placement is an additional certification orientation, taken on top of the vertical one if you want it listed. It has two parts:

• Part I: a workmanship checklist on which you must score at least 75%.
• Part II: evaluation of five cores taken from your placed panel.

The written exam covers only the knowledge component. It does not replace or predict the practical assessment, which tests whether you can actually place shotcrete correctly. Practice-test sessions help with the former; the latter requires time on the nozzle.

How the Five-Core Grading Works

Part II is the portion candidates most often misunderstand. Five cores are cut and graded. You fail Part II in either of two situations:

1. Any single core is graded above 3, or
2. More than two cores receive a grade of 3.

The cores are evaluated for the defects that poor technique produces, such as voids, sand pockets, laminations, and poor encapsulation around reinforcement. That is why the technical domains below, especially water control, nozzle technique, and reinforcement encapsulation, show up in both the written and the practical results.

The Ten Knowledge Areas You Must Master

ACI's published required-knowledge headings for this credential number ten. They are official examination knowledge areas supported by the JTA, not a percentage-weighted blueprint, so do not assume any one domain is a fixed share of the exam. For deeper coverage of each, read our complete guide to all 10 content areas.

An original practice-style question

Here is the kind of reasoning the written exam rewards, written for teaching rather than taken from any exam: While placing dry-mix shotcrete on a vertical wall, the surface looks dry and dull, with excess rebound and poor build-up. What is the most likely corrective action at the nozzle? The answer is to increase the water at the nozzle (and check the delivery to the water ring), because in the dry-mix process the nozzleman controls hydration, and a dry, dusty appearance signals insufficient water. Notice that the correct answer comes from understanding the process, not from memorizing a number. For more of this style, work through the practice tests on our main site.

Experience Hours: Trainee Versus Full Certification

ACI imposes no specific education prerequisite. Eligibility is built on verified work experience, and the hour counts are easy to confuse. Here is how the two levels differ.

A trainee can later upgrade by adding 475 qualifying hours, but only for the remainder of the original certification term. Details on eligibility are in our requirements guide.

Budgeting, Renewal, and the ACI/ASA Hour Discrepancy

Budget by component, not by a single fee

There is no all-inclusive national candidate fee. ASA's currently linked fee schedule (December 2024 file) lists charges as components, shown here as ASA-member / non-member in US dollars:

Session, equipment, materials, coring, and other applicable costs must be budgeted separately, and your sponsor may price things differently. Our certification cost breakdown walks through how to assemble a realistic total.

Renewal and the sponsor conflict

Certification lasts five years. Renewal normally requires the then-current written and performance examinations plus applicable experience requirements. An eligible alternative is a structured interview plus performance route. For that 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.

A Domain-Ordered Preparation Sequence

The current program links the fourth-edition CP-60 Shotcreter Craftsman Workbook, in English and Spanish, which includes CCS-4, Shotcrete for the Craftsman. The public JTA is useful for seeing what tasks are tested, but it is not a substitute for the workbook. Build your plan around the workbook and your sponsor's materials, and use original practice questions to test understanding. Avoid marketplace "answer sets" posted on document-sharing sites; they are not authenticated examination material. For a fuller plan, see the study guide.

The ordering is deliberate: placement technique (Domain 5) makes far more sense once you understand the materials and equipment behind it, and testing and curing questions are easier once you know how defects form. Use the cheat sheet for quick review near exam day, and gauge your readiness with our difficulty guide.

Where the Credential Gets Used

Dry-mix shotcrete shows up in repair and rehabilitation of concrete structures, refractory and industrial work, tunnel and slope support, pools, and other applications where the process suits the job and the placement conditions. Employers and specifiers in these areas often look for certified nozzlemen on crews, and some project specifications call for ACI-certified shotcreters by name. See Shotcrete Nozzleman (Dry-Mix) jobs for more on the work itself.

On pay, be careful with claims. Local job-market conditions, project type, union status, and travel all move earnings, and there is no solid basis for assuming a fixed pay premium attributable to the certification alone. Our salary guide and ROI analysis treat local market evidence separately from any certification-specific effect.

Frequently Asked Questions