ACI CTCI case studies
ACI CTCI · Put your knowledge to work in context.
The Concrete Transportation Construction Inspector (CTCI) credential is one of the certification programs administered by the American Concrete Institute. ACI describes its certification offerings as designed to form a minimum qualification for personnel employed within the concrete construction industry, and the CTCI sits within the Inspection Programs group, which ACI characterizes as assessing the knowledge to inspect various concrete installation and construction practices. It is intended for personnel who inspect concrete work on transportation projects, where field decisions about placement, testing, and documentation carry real consequences. The exam draws on two broad knowledge areas: concrete construction inspection and concrete field and laboratory testing. The ACI CTCI case studies are 5 cases and about 1,729 words.
1Slump Test Disagreement on a Pumped Placement
A ready-mix truck arrives with a batch ticket showing a design slump of 4 in. The specification permits a tolerance of ±1 in at the point of placement.
417 words, about 2 min2Cylinder Break Pattern Below Design Strength
A set of three 6x12 in. cylinders for a 4000 psi mix is tested at 28 days.
361 words, about 2 min3Cold-Weather Placement and Protection Timing
Concrete is placed at 4:00 p.m. in ambient air at 38 F with a forecast low of 22 F overnight and 30 F the following day.
339 words, about 2 min4Consolidation of a Dense-Reinforced Beam-Column Joint
A beam-column joint contains #11 column bars, #9 beam bars, and #4 ties at 4 in. The clear spacing between bars in the congested zone is approximately 2.5 in.
323 words, about 2 min5Rebound Hammer Results Disagree with Cores
A technician uses a rebound hammer on a 90-day-old slab to estimate in-place strength after a cylinder set came in low. Rebound numbers average 34, which the technician's correlation table converts to roughly 4200 psi.
289 words, about 1 min