ACI Flatwork Technician case studies
ACI Flatwork Technician · Put your knowledge to work in context.
The ACI Concrete Flatwork Associate, Finisher, and Advanced Finisher program is one of the construction and specialist certifications listed by ACI under "Concrete Installation and Finishing." ACI describes its certification programs as designed to form a minimum qualification for personnel employed within the concrete construction industry, and examinations plus optional training courses are delivered through an international network of sponsoring groups rather than a single central testing site. The family is structured as a progression: Associate, Finisher, and Advanced Finisher, with the higher tiers typically expected to demonstrate deeper knowledge of placing, finishing, and troubleshooting flatwork. The ACI Flatwork Technician case studies are 5 cases and about 3,579 words.
1Plastic Shrinkage Cracking on an Exposed Slab
A crew is placing a 4,000 sq ft exterior slab on grade at 2:00 p.m. Air temperature is 92°F, relative humidity is 28%, and there is a steady 15 mph wind across the pour.
674 words, about 3 min2Saw-Cut Timing on a High-Early-Strength Mix
A flatwork finisher is responsible for control joints on a 6-inch interior slab placed with a high-early-strength mix designed to reach 3,000 psi in 24 hours. Ambient temperature is 78°F and falling overnight to 55°F.
779 words, about 4 min3Bull-Float vs. Trowel Timing on a Power-Troweled Floor
A finisher is placing a 5,000 sq ft interior warehouse floor with a burnished finish. The mix is a 4,500 psi mix with a 0.45 w/cm ratio and a moderate slump.
736 words, about 4 min4Joint Layout Around a Column and a Doorway
A finisher is laying out control joints for a 40 ft by 60 ft slab-on-grade warehouse floor, 6 inches thick, with a 12 ft by 12 ft column grid. There is a 10 ft wide overhead door opening on one 60 ft wall, and the slab abuts a rigid foundation wall on the opposite side.
696 words, about 3 min5Finishing and Curing a Slab in Cold Weather
A finisher is placing a 3,000 sq ft exterior slab in late November. The forecast high is 40°F, dropping to 25°F overnight.
694 words, about 3 min