ACI Strength Testing case studies
ACI Strength Testing · Put your knowledge to work in context.
The Concrete Strength Testing Technician credential is one of the certification programs offered by the American Concrete Institute. ACI describes its certification programs as designed to form a minimum qualification for personnel employed within the concrete construction industry, and it lists the Concrete Strength Testing Technician under its Laboratory Concrete Testing offerings, a category ACI says assesses the knowledge and ability to perform, record, and report the results of concrete field and laboratory tests. The credential therefore suits technicians and laboratory staff who prepare, handle, and test concrete specimens and report the resulting strength data, as well as the supervisors who review that work. Because examinations and optional training courses are conducted through an international network of sponsoring groups, candidates register and test through a local sponsoring group rather than a single central location. The ACI Strength Testing case studies are 5 cases and about 1,851 words.
1Cylinder Break Pattern Below Design Strength
A 28-day set of three 6x12 in. cylinders from a ready-mix pour (design f'c = 4000 psi) breaks at 3420, 3560, and 3710 psi.
412 words, about 2 min2Sulfur Cap Failure on High-Strength Cylinders
A laboratory is testing 4x8 in. high-strength concrete cylinders specified at f'c = 8000 psi.
379 words, about 2 min3Cylinder Mold Filling and Rodding Dispute
A technician is casting 6x12 in. cylinders from a slump of 1.5 in.
370 words, about 2 min4Loading Rate and Machine Compliance on a 3,000 psi Mix
A 3000 psi design mix is being tested at 28 days. The testing machine has a 250,000 lbf capacity and a spherical seat that is slightly stiff.
347 words, about 2 min5Core Testing After Low Cylinder Breaks
A set of three 6x12 in. cylinders from a 4500 psi mix breaks at 3900, 4100, and 4200 psi at 28 days.
343 words, about 2 min