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.
These 10 free CSMT questions are organized by exam domain, so you can see how each part of the Concrete Slab Moisture Testing Technician blueprint is tested. Reveal the answer and explanation under each question.
Valid surface pH measurements on a prepared slab range from 9.5 to 9.8. The approved flooring and adhesive system permits pH 7.0-11.0, and its other installation requirements have been met. An installer requests neutralization because a chart from a different adhesive lists pH 9.0 as its maximum. What should the pH assessment conclude?
Correct answer: D - The measurements satisfy the approved system's stated pH range.
A calcium chloride assembly increases from 31.2 g to 34.4 g during a valid 68-hour test. The prepared patch measures 20 x 20 inches; the kit's net exposed concrete area is 80 in². The adhesive's maximum MVER is 4.8 lb/1,000 ft²/24 h. Use MVER = (mass gain in g / 453.59237) x (1,000 / exposed area in ft²) x (24 / exposure hours), with 1 ft² = 144 in². Which report entry uses the proper inputs and correctly applies this limit?
Correct answer: A - 4.48 lb/1,000 ft²/24 h; meets the MVER limit.
A bonded cement-based leveling layer covers a normal-weight concrete slab. The contract requires ASTM F1869 results for the underlying slab, and the approved preparation plan allows removal of small test patches. Which preparation plan will produce an eligible test surface?
Correct answer: A - Expose bare concrete; complete the required preparation and waiting.
An elevated concrete slab is 8.0 inches thick at the planned ASTM F2170 test location. Permanent, nonvented steel decking prevents drying through the underside; the top is exposed. At what depth below the top surface should the RH test hole terminate?
Correct answer: B - 3.2 inches
The building air and slab have been at service conditions for 72 hours. Three hours after correctly preparing and sealing a new ASTM F2170 hole, a resident sensor gives stable readings below the flooring's RH limit. The superintendent wants the final result immediately. Which requirement remains unmet?
Correct answer: B - At least 24 hours of equilibration for the new test hole.
RH test locations have been marked on an unbonded post-tensioned slab. Available drawings show approximate tendon routes, but local tendon positions have not been verified. The foreman argues that the small drill diameter makes a tendon strike harmless. Before drilling proceeds, what is necessary?
Correct answer: C - Have tendon locations verified and safe drilling positions established.
A reusable RH probe has a current calibration certificate. In a correctly prepared verification chamber at a stable 25°C, it repeatedly reads 79.0% RH after the prescribed stabilization. Its manufacturer's acceptable range for this check is 73.1-77.5% RH. User-applied correction factors are not authorized. How should the probe be handled?
Correct answer: D - Remove it from testing and follow the manufacturer's corrective procedure.
A concrete moisture meter passes its check plate, then gives erratic readings over a gritty patch where several spring-loaded contacts do not seat. It reads steadily on clean concrete nearby. Before interpreting the patch, the technician should:
Correct answer: D - Remove the grit, clean the contacts, and repeat with full contact.
A flooring manufacturer's water-drop procedure classifies water remaining after one minute as a nonabsorptive result. On clean, sound concrete, the test drops remain at 90 seconds. The specified flooring system permits nonabsorptive concrete, provides instructions for it, and all other substrate checks have passed. How should this finding affect the installation approach?
Correct answer: C - Follow the approved nonabsorptive procedure without adding grinding solely for this result.
Monday's water-drop tests were performed over an existing sealer. The sealer was mechanically removed on Tuesday, exposing the concrete that will receive the new flooring system. The adhesive has separate procedures for porous and nonporous surfaces. What evidence should govern that choice now?
Correct answer: C - Water-drop observations on the final prepared concrete surface.
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