ACI Field Testing I case studies
ACI Field Testing I · Put your knowledge to work in context.
The ACI Concrete Field Testing Technician-Grade I is an entry-level credential for people who sample and test freshly mixed concrete on construction sites. ACI lists it among its Field Concrete Testing programs, within a certification portfolio of over 30 programs designed to form a minimum qualification for personnel employed within the concrete construction industry. Examinations, and optional training courses, are conducted through an international network of over 135 sponsoring groups, so scheduling and logistics run through a local sponsor rather than a single central venue. Candidates face two components: a multiple-choice paper and a hands-on performance test in which they carry out standard field procedures and report results. The ACI Field Testing I case studies are 5 cases and about 2,896 words.
1Sampling Location and an Invalid Slump Test
A 9 yd³ truck mixer arrives at 2:10 p.m., 45 minutes after batching. The specified concrete is 3 to 5 in.
589 words, about 3 min2Temperature Measurement and Initial Cylinder Curing
On a 98°F afternoon, a technician checks the fresh concrete temperature before placing a slab. The specification limits concrete to 95°F.
590 words, about 3 min3Density, Yield, and Gravimetric Air Check
A 1.00 ft³ measure weighs 9.2 lb empty and 153.0 lb filled with consolidated concrete. The batch ticket shows cement 650 lb, water 280 lb, fine aggregate 1,180 lb, coarse aggregate 1,920 lb, and a design volume of 27.0 ft³.
589 words, about 3 min4Pressure Versus Volumetric Air Content With Lightweight Aggregate
A volumetric air meter is used on a 0.25 ft³ sample of concrete containing lightweight coarse aggregate. The technician fills the meter in three layers, rods 25 strokes per layer, strikes off, adds water, rolls the meter, and reads 7.5% after the water level stabilizes.
563 words, about 3 min5Cylinder Molding, Curing, and a Cap Failure
A technician molds three 4 by 8 in. cylinders for a 7-day check.
565 words, about 3 min