10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CMT exam has 110 questions and runs 2 hours 50 minutes.
These 10 free CMT questions are organized by exam domain, so you can see how each part of the Certification in Construction Materials Testing - Concrete Level I (CMT) blueprint is tested. Reveal the answer and explanation under each question.
A technician kneels in fresh concrete while finishing cylinder specimens and feels no discomfort at the time. Several hours later, severe skin damage develops at the contact areas. This delayed injury occurs because fresh concrete is:
Correct answer: B - Strongly alkaline, producing caustic burns that progress with prolonged contact
The structural drawings identify a footing as Class A concrete, while the cast-in-place concrete specification assigns Class B to that same element. The Level I technician should:
Correct answer: D - Document the conflict and refer it to the supervisor for resolution
The final portion of a composite sample of freshly mixed concrete is obtained at 9:14 a.m. By what time must the slump test be started?
Correct answer: B - 9:19 a.m.
A technician must obtain an aggregate sample from a conveyor belt that is in operation. The correct procedure is to:
Correct answer: A - Stop the belt and remove all material between two templates, including fines
Cylinders are cast from concrete having a specified compressive strength of 7,000 psi. Throughout the initial curing period, the specimens must be maintained at a temperature of:
Correct answer: D - 68 to 78 °F
A technician performing a slump test fills the mold in three layers as required by the test method. The first layer is filled to a depth of approximately:
Correct answer: B - 2-5/8 in.
Which statement correctly describes the aggregate correction factor used with the pressure method for air content?
Correct answer: A - It is subtracted from the meter reading to account for air in the aggregate
An aggregate sample has a wet mass of 1,486 g and an oven-dry mass of 1,442 g. The absorption of the aggregate is 1.2 percent. What is the total evaporable moisture content?
Correct answer: C - 3.05 percent
Two diameters measured at right angles near the mid-height of a concrete cylinder differ by 2.6 percent. The technician should:
Correct answer: D - Not test the specimen and report the condition to the supervisor
A unit weight determination gives a relative yield of 1.04. This indicates that the batch:
Correct answer: A - Produced more concrete than its design volume
The CMT exam also covers these domains. Drill them in the full free practice test:
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