ACI Dry-Mix Nozzleman study plan

Map the dry-mix nozzle operation sequence from pre-wet check to final pass and label each step's decision points

Explain how nozzle distance, angle, and travel speed each change build thickness and surface finish

Demonstrate (or narrate aloud) correct gun-start and gun-stop technique that avoids cold joints and lumpy starts

Identify the five most common nozzle-technique defects and state the corrective action for each

Trace material flow from gun to nozzle tip and explain what each air and water control changes

Adjust water at the nozzle to hit a target consistency and describe the visual cues for too-wet and too-dry mix

Diagnose three air/water control faults (pulsing, surging, wet slugs) and state the first corrective step for each

List hose and nozzle wear indicators and the point at which each part is replaced

Describe how cementitious binder, aggregate gradation, and admixtures affect set time and rebound in the dry-mix process

Explain why water is added only at the nozzle and how that constrains mixture proportioning

Compare the effect of fiber reinforcement and polymer modification on placement and finishing behavior

Identify how ambient temperature and substrate moisture shift the working consistency target

Sequence substrate preparation steps for concrete, masonry, and steel and state the acceptance criteria before shooting

Explain surface profile, saturation, and bonding-agent decisions and when each applies

Describe placement sequencing for walls, overheads, and repairs to avoid shadowing and cold joints

Outline finishing steps and the timing window for each relative to set

Assemble a pre-shift equipment inspection routine covering gun, hose, nozzle, gaskets, and air/water supply

State safe shutdown, depressurization, and hose-handling steps in correct order

Match placement method to section thickness and reinforcement spacing

Explain how nozzle orientation and rebound control change when shooting overhead versus vertical

List the field tests and inspections that apply to dry-mix placement and what each one verifies

Explain sampling, specimen handling, and recordkeeping expectations for acceptance testing

Identify visual inspection criteria for thickness, voids, delamination, and surface defects

Describe how to document a nonconformance from discovery through disposition

Classify defects as cosmetic, structural, or bonding failures and select the matching repair method

Write rework steps for honeycomb, delamination, and cold joints including surface prep for the repair

Identify personal protective equipment, silica-dust controls, and confined-space and overhead hazards for nozzle work

State environmental and regulatory obligations for waste, washout, and airborne dust on a dry-mix job

Run two full-length timed practice exams and review every missed item to root cause

Re-drill weak items in the heaviest domains until each is answered correctly twice

Rehearse verbal explanations of nozzle technique, troubleshooting, and repair decisions as if teaching an apprentice

Confirm exam-day logistics, allowed references, and time-allocation strategy