ACI MFTT case studies
ACI MFTT · Put your knowledge to work in context.
The ACI Masonry Field Testing Technician (MFTT) is a certification in the Masonry Testing group of the American Concrete Institute's certification programs. ACI describes its testing programs as assessing the knowledge and ability to perform, record, and report the results of concrete field and laboratory tests; the masonry field technician credential applies that model to masonry construction. It is aimed at technicians, inspectors, and quality-control staff who sample masonry materials, perform field tests on mortar and grout, and construct, cure, and test masonry prisms. The exam content is commonly organized around five areas: materials, units, mortar, and grout sampling; field testing of mortar and grout; prism construction, curing, and compressive strength testing; unit compressive strength and absorption/saturation testing; and test records, reporting, and personnel qualification. The ACI MFTT case studies are 5 cases and about 2,877 words.
1Retempered Mortar on the Board
A technician arrives at a three-story CMU bearing-wall project where Type S mortar with a 1,800 psi 28-day specified strength is in use. the mortar board holds the remains of a batch mixed at 9:50 a.m.
600 words, about 3 min2Five Cubes, One Broken Corner
A technician molds 2-in. mortar cubes for a 28-day acceptance set on a project 40 minutes from the laboratory.
570 words, about 3 min3Grout Specimens from a Sun-Baked Pallet
A contractor is grouting 8-in. CMU walls in 8-ft lifts with a 2,000 psi coarse grout pumped from a mixer about 90 ft away.
599 words, about 3 min4Prisms Cured Under a Tarp
Three 3-block-high prisms are built with 8-in. units from the wall pallet and mortar from the field batch to represent a wall with a 1,500 psi prism requirement.
553 words, about 3 min5The Broken Cube, the Wet Pallet, and the Expired Certification
A technician samples 8-in. CMU for a project specifying a 1,900 psi net-area compressive strength with ASTM C90 compliance.
555 words, about 3 min