ACI Shotcrete Inspector study guide
ACI Shotcrete Inspector · Work through your exam, one topic at a time.
The ACI Shotcrete Inspector credential is one of the certification programs administered by the American Concrete Institute, an organization that describes its offerings as designed to form a minimum qualification for personnel employed within the concrete construction industry. It is intended for inspectors and technicians who verify that shotcrete materials, application, and finished work meet project specifications and referenced standards. The ACI Shotcrete Inspector study guide has 5 sections and about 1,345 words.
01Shotcrete Materials and Mixtures
Shotcrete is concrete or mortar placed by pneumatic projection, and its mixture design differs from conventional concrete because it must be pumpable, cohesive, and capable of sticking to a vertical or overhead surface without sagging or rebounding excessively. Candidates should know the two placement processes-dry-mix (materials combined at the nozzle with water added there) and wet-mix (fully mixed concrete pumped to the nozzle, with air and sometimes accelerator added)-because mixture proportions, water control, and testing implications differ between them.
296 words, about 1 min02Shotcrete Equipment and Application Methods
Shotcrete equipment includes batching and mixing plants, pumps (piston, squeeze-tube, or rotor-stator), delivery lines (hoses and pipes), nozzles, and air compressors. Candidates should understand how equipment selection interacts with mixture design: line diameter, length, and bends affect pressure and segregation; air volume and pressure at the nozzle control velocity and spray pattern; and nozzle type (dry-mix versus wet-mix) determines where water and accelerator are introduced.
283 words, about 1 min03Surface Preparation and Placement
Successful shotcrete depends heavily on surface preparation and placement technique. Surfaces must be sound, clean, and free of loose material, dust, oil, form release agents, and standing water.
245 words, about 1 min04Inspection, Testing, and Quality Control
Inspection and testing verify that shotcrete meets thickness, strength, and quality requirements. Candidates should know pre-construction testing (often a test panel shot by the production nozzleman under site conditions) and production testing.
269 words, about 1 min05Repair, Safety, and Standards Compliance
Repair of shotcrete involves identifying defects-voids, delaminations, honeycomb, dry patches, overspray, and cracks-and removing unsound material to a sound substrate before patching. Repair procedures typically require chipping or saw-cutting to a defined edge, cleaning, pre-wetting, and reapplying shotcrete or a suitable repair mortar, often with bonding agent per specification.
252 words, about 1 min