ACI Field Testing I study guide
ACI Field Testing I · Work through your exam, one topic at a time.
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. The ACI Field Testing I study guide has 8 sections and about 2,314 words.
01Sampling Freshly Mixed Concrete
Sampling is the first point at which a test result can be invalidated. The sample must represent the entire batch, not the easiest concrete to reach.
329 words, about 2 min02Temperature of Freshly Mixed Concrete
Temperature is a simple test with strict details. Use a thermometer with accuracy of at least ±1°F (±0.5°C) and a range that covers the expected concrete temperature.
307 words, about 2 min03Slump of Hydraulic Cement Concrete
The slump test uses a standard mold 4 in. (100 mm) across the top, 8 in.
302 words, about 2 min04Density (Unit Weight), Yield, and Gravimetric Air Content
Density, unit weight, yield, and gravimetric air content come from one set of measurements. Determine the volume of the measuring bowl by filling it with water and weighing; use that calibrated volume, not a nominal size.
276 words, about 1 min05Air Content by the Pressure Method
The pressure method measures air by compressing the concrete in a sealed bowl and reading the gauge. Fill the bowl in three layers, rod each layer 25 times, tap the sides, strike off, and clean the flange.
262 words, about 1 min06Air Content by the Volumetric Method
The volumetric method measures air by displacing it with water and alcohol in a calibrated meter. Fill the meter with concrete in layers, consolidate each layer, and strike off.
280 words, about 1 min07Making and Curing Concrete Test Specimens in the Field
Field specimens must represent the concrete and be made promptly. Use clean, properly sized molds: 6 by 12 in.
298 words, about 1 min08Capping and Compressive Strength Testing of Cylindrical Specimens
Capped ends must be flat, perpendicular, and parallel so the load is applied uniformly. Use sulfur mortar or another approved capping material, and follow its curing requirements.
260 words, about 1 min