Concrete Flatwork Tech and Flatwork Finisher Exam Questions And Answers

Concrete Flatwork Tech and Flatwork Finisher Exam Questions And Answers (Ch. 1, #1) It is important that the _______ _______ read and understand project specifications - answerfinishing foreman (Ch. 1, #2) If the crew can place and finish 100yd^3 (m^3) of concrete per hour, the producer's rate should be about ____ yd^3(m^3) per hour. - answer100 (Ch 1, #3) True or False: Concrete is sold by the ton. - answerFalse (sold by volume) (Ch. 1, #4) Delays in discharging concrete trucks can result in the concrete being hard to: - answerpump, place, and finish (Ch. 1, #5) A) Inch/Pound: For a concrete floor slab that is 6 in. thick, 200ft long, and 100 ft wide you should order ____ yd^3 of concrete, assuming a 10% waste factor. B) Metric: For a concrete floor slab that is 150 mm thick, 60 m long, and 30 m wide you should order ____ m^3 of concrete, assuming a 10% waste factor. - answerA) 407.41; B) 297 (Ch. 1, #6) When there is room for two concrete trucks ready to discharge into a pump hopper, placement is faster because: - answeras one truck is finishing, the other is ready to unload concrete (Ch. 1, #7) Concrete from a ready mix truck must be completely discharged within ____ hours after water has been added at the plant. - answer1.5 (Ch. 1, #8) You can tell when water was added to the concrete truck by looking at the: - answerbatch ticket (Ch. 1, #9) When concrete for a slab placement will be discharged from the truck chute, truck arrivals should usually be spaced about: - answer15 minutes (Ch. 1, #10) True or False: When finishers get behind because the concrete is setting faster than expected and the placing crew is also shorthanded, one solution is slowing the concrete delivery rate to match worker output. - answerTrue (Ch. 1, #11) True or False: In deciding how much concrete to order for a floor placement, you should calculate the number of cubic yards (cubic meters) needed to fill the forms, then order two or three cubic yards (cubic meters) less so you don't waste concrete that is not needed. - answerFalse (Standard is to order 10% to 15% *more* than measured volume for small orders and 5 to 10% more than measured volume for large orders to account for subgrade settlement, uneven subgrade, spillage, and waste.) (Ch. 1, #12) The question "What finisher or finishers can request the addition of water to the concrete truck on site?" Should be answered at the _________ __________. - answerpreconstruction conference (Ch. 2, #1) True or False: Concrete made with portland cement will set and harden while underwater. - answerTrue (Ch. 2, #2) If a concrete slab on ground won't be exposed to sulfates, the cement used is most likely to be: - answerType I (Ch. 2, #3) Fly ash may be added to concrete from a fly ash silo at the batch plant or from a silo containing a _______ cement. - answerportland (Ch. 2, #4) Most concrete used in slabs on ground has course aggregate with a maximum size of: - answer0.75 to 1.5 in. (19 to 38 mm.) (Ch. 2, #5) True or False: Sand for concrete used in slabs on ground is easier to finish when it has close to the largest allowable amount of material passing the No. 50 and No. 100 sieves. - answerTrue (Ch. 2, #6) True or False: Increasing the amount of sand in a concrete usually decreases the amount of water needed to make the concrete workable. - answerFalse (Too many small particles will *increase* the amount of water needed to make the concrete workable.) (Ch. 2, #7) All concrete that will be subject to freezing when moist or be exposed to deicing salts should contain: - answeran air-entraining agent (Ch. 2, #8) Strength of normal weight concrete depends mainly on: - answerwater-cement ratio (Ch. 2, #9) True or False: Oversanded concrete mixtures are likely to produce floors with poor wear resistance and excessive shrinkage. - answerTrue (Ch. 2, #10) To minimize shrinkage and reduce cracking and curling: - answerUse as much coarse aggregate as possible, as little mixing water as possible, and use aggregates with low shrinkage. (Ch. 2, #11) Changes in concrete slump most often represent changes in the amount of ______ in the mixture. - answerwater (Ch. 2, #12) Air-entrained concrete is *not* recommended for use in concrete slabs: - answerfinished by repeated steel troweling passes