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These 10 free Advanced Flatwork Finisher questions are organized by exam domain, so you can see how each part of the Advanced Concrete Flatwork Finisher blueprint is tested. Reveal the answer and explanation under each question.
For a continuous floor placement, the producer can supply 72 yd³/h, the pump can place 54 yd³/h, the screeding crew can handle 45 yd³/h, and the finishing crew can sustain 36 yd³/h. These are established jobsite capacities, and no additional equipment or workers are available. What spacing between 9-yd³ truckloads matches the highest sustainable rate for the complete operation?
Correct answer: D - One truck every 15 minutes
An undischarged truckload contains 4,000 lb of portland cement, 1,000 lb of slag cement, and 2,000 lb of effective mixing water, including aggregate moisture. Its slump is below the permitted range; all other delivery criteria are satisfied. The project permits authorized water adjustment within a maximum water-cementitious materials ratio of 0.45. The producer proposes adding 20 US gal of water. Using 8.34 lb per gallon, which decision is justified?
Correct answer: D - Permit the addition with remixing and retesting; the resulting water-cementitious materials ratio is about 0.43.
An interior slab will receive resilient flooring installed with a moisture-sensitive adhesive. During planning, a contractor proposes placing a sand blotter layer above the vapor retarder to shorten the wait for finishing. The layer could be exposed to rain before the building is enclosed. Which proposed detail best limits a moisture reservoir immediately beneath the slab?
Correct answer: A - Place the concrete directly on the continuous, sealed vapor retarder.
A random-traffic floor specification requires overall FF 40 and FL 30, with minimum local FF 25 and FL 18. Proper ASTM E1155 testing, completed 36 hours after placement, reports overall FF 48 and FL 36. One fully sampled local test area has FF 22 and FL 24; every other local area passes. How should the report be interpreted?
Correct answer: B - The overall requirements pass, but one area fails minimum local flatness.
Concrete flow suddenly stops in a pump delivery line. The operator confirms that the line is still pressurized, and a worker reaches for a coupling clamp to look for the blockage. What is the immediate response?
Correct answer: A - Keep the clamp closed, clear personnel, and have the operator stop pumping and verify depressurization before opening the line.
A magnesium bull float and a fresno both have long handles, but they are not interchangeable. The task is initial leveling immediately after strikeoff, before bleed water accumulates. Which instruction respects the difference?
Correct answer: C - Use a magnesium bull float now; the fresno is a steel troweling tool.
A warehouse slab has been placed over a cold base beside open loading-bay doors. The exposed surface looks dry and leaves a 3/16-in. boot print. Under a small covered test patch, however, bleed water is still collecting and the concrete beneath the surface remains soft. Which finding should control the decision to begin machine floating?
Correct answer: B - Continued bleeding beneath a dry skin, despite the shallow boot print
An air-entrained exterior pedestrian ramp will be exposed to freezing weather and wet foot traffic. Bleeding has ended, the edges are finished, and the floated surface holds clean broom grooves without tearing. The next step in producing traction along the direction of travel is to:
Correct answer: C - Broom across the direction of travel without first hard steel-troweling the surface.
Five hours after final finishing, a conventional saw makes a trial cut in a 6-in. slab. The cut reaches the specified 1.5-in. depth, the edges remain sound, and the slab supports the equipment without damage. No random cracks are visible. The crew had tentatively scheduled joint cutting for the next morning. What should the saw operator do now?
Correct answer: D - Begin the planned joint cuts now at the specified depth.
"The retarder gives us more time, so evaporation protection can wait until the last finishing pass." A supervisor proposes this plan as dry wind develops over an outdoor placement. What change is needed?
Correct answer: B - Use windbreaks and fog above the slab now; retain the specified final-curing plan.
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