ACI Flatwork Finisher case studies
ACI Flatwork Finisher · Put your knowledge to work in context.
The ACI Concrete Flatwork Finisher credential sits within the ACI certification family of Concrete Installation and Finishing programs, which the source lists as "Concrete Flatwork Associate, Finisher, and Advanced Finisher." ACI describes its certification programs as designed to form a minimum qualification for personnel employed within the concrete construction industry, and exams and optional training courses are delivered through an international network of sponsoring groups. The flatwork programs are aimed at people who place, screed, float, trowel, joint, cure, and finish concrete flatwork in the field, with the Associate, Finisher, and Advanced Finisher tiers reflecting progressively broader knowledge and responsibility. The ACI Flatwork Finisher case studies are 5 cases and about 2,208 words.
1Mid-Slab Set Time Shift on a Warm, Windy Placement
You are finishing a 6,000 ft² interior slab on grade placed at 9:00 a.m. The mix is a 4,000 psi air-entrained mix with a water reducer and a normal-set retarder dosed for a 70°F day.
456 words, about 2 min2Saw-Cut Window on a Restrained Slab With a Late Start
A 10,000 ft² warehouse slab, 6 in. thick, is placed on a vapor barrier with doweled construction joints and a mix at 0.48 w/c with 25% fly ash.
471 words, about 2 min3Broom Texture Failure on a Freeze-Thaw Exterior Apron
You are finishing a 2,500 ft² exterior concrete apron at a commercial building. The spec calls for a medium broom finish, air entrainment of 6-8%, and a 1/4 in.
449 words, about 2 min4Power Trowel Burn on a Polished Retail Slab
A 4,000 ft² retail floor is specified as a burnished, power-troweled slab with a densifier and a stain guard. The mix is a 4,500 psi mix with a retarder for a 6:00 a.m.
433 words, about 2 min5Cold-Weather Flatwork With a Frozen Subgrade and Early Finishing
A 3,000 ft² exterior sidewalk and pad placement is scheduled for a 35°F day with a forecast low of 22°F overnight. The subgrade was exposed overnight and has a frozen crust about 1 in.
399 words, about 2 min