ACI Shotcrete Inspector case studies
ACI Shotcrete Inspector · Put your knowledge to work in context.
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 case studies are 5 cases and about 3,011 words.
1Rebound Control on a Wet-Mix Tunnel Lining
A crew is placing a 100 mm wet-mix lining on the crown of a tunnel using a robotic arm. The mix has a water/cement ratio of 0.45, 10 mm aggregate, and a target slump of 90 mm.
624 words, about 3 min2Overspray and Cold Joint on a Vertical Wall Repair
A 250 mm thick retaining wall has a 1.2 m × 2.0 m area of delaminated, chloride-contaminated concrete at mid-height. The repair specification calls for removal to sound concrete, a bonding agent, and a 75 mm shotcrete repair.
666 words, about 3 min3Early-Age Strength for a Slope Stabilization Panel
A dry-mix shotcrete is being applied to a 1:1 rock slope for temporary stabilization. The design requires a 28-day compressive strength of 35 MPa and an early-age strength sufficient to allow removal of temporary formwork and access by workers within 24 hours.
580 words, about 3 min4Fiber Reinforcement Uniformity in a Wet-Mix Overhead Application
A wet-mix mix design specifies 40 kg/m³ of steel macro-fibers for a 75 mm overhead lining in a parking structure. During placement, the nozzleman reports fibers 'balling' at the nozzle and uneven distribution in the finished surface.
578 words, about 3 min5Qualification of a Nozzleman and Equipment on a New Project
A new project requires ACI-certified shotcrete nozzlemen. The contractor submits certificates for two nozzlemen: one certified for wet-mix vertical and overhead work, one certified for dry-mix only.
563 words, about 3 min