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Section 2 CONCRETE
35. When pouring wing walls that will house a closed concrete stair, what procedure should be used so the inverted stringers can be easily attached? A. Set ready rod ties in concrete in specified locations for attachment. B. Set threaded inserts into concrete in specified locations for attachment. C. Set taper ties into concrete in specified locations for attachment because they can be removed and filled with grout later. D. Use explosive actuated tools to attach inverted stringers because there is less chance for error of attachment locations. 36.An exterior stair for a full care facility has a total rise of 832 mm (32¾") and the suggested unit rise is 125 mm (6"). Using the 430 mm (17") guideline, what is the unit rise and unit run for this stair? Metric A. 118.9 mm – 311.1 mm B. 125.0 mm – 305.0 mm C. 138.7 mm – 291.3 mm D. 201.3 mm – 228.7 mm Imperial A. 5½" – 12½" B. 6" – 11" C. 6½" – 10½" D. 8?" – 8?" 37. What procedure is used when forming post tensioned suspended slabs and installing the reinforcement? A. Set the mechanical sleeves and inserts before post tensioning tendons. B. Set the chairs for post tensioning tendons so that they are all at the same height (top third of the slab). C. Set the regular reinforcing steel before post tensioning tendons. D. Set the chairs for post tensioning tendons at so that they remain in the tension third of the slab. 38. When placing longitudinal and temperature steel for an exterior concretestair, how is the size of steel required determined and where to tie thesteel to achieve proper concrete coverage all around? A. Refer to the architectural drawings. B. Refer to the largest scale architectural detail that shows the stair. C. Refer to the structural drawings. D. Refer to the largest scale structural detail that shows the stair 39. What is a tag line? A. A line attached to the workers so they cannot fall off a floor slab. B. A line attached to the fly forms to keep them from spinning. C. A line attached to the fly form to keep it from falling if the crane cable fails. D. A line attached to the fly form so it can be pulled horizontally to the edge of the building for lifting to the next floor. 40. When form watching below a suspended slab pour what must be carefully check and watch for? A. That formply seams running in the direction of the joists are no more than four feet long. B. That joists are not cracked below the weight of the stringers. C. That the stringers are wedged tight in the U-heads. D. That the scaffolding/shoring and all uprights are tight and loaded evenly. 41. What procedure is used to ensure a true surface is achieved when pouring a concrete slab? A. Screeding and power floating. B. Screeding and bullfloating. C. Bullfloating and trowelling. D. Screeding and fresnoing. 42. What is one critical step to ensure proper curing of concrete? A. Place a polyethylene barrier on the ground before concrete placement. B. Place a polyethylene barrier on the ground and wet it before concrete placement. C. Place a polyethylene sheet immediately on top of the freshly finished concrete so it does not have a chance to dry out. D. Place dry burlap on top of the freshly finished concrete and spray it with water an hour later so the concrete can begin to set up. 43. What is one method that can be used to prevent concrete from freezing in cold weather? A. Direct fired heaters. B. Insulated tarps. C. Concrete accelerators. D. Concrete retarders. 44. For precast and tilt-up structures, temporary bracing can be attached to inserts in the member itself and a ground member. What must be confirmed before lifting panels and attaching bracing? A. The proper inserts are used and concrete is strong enough. B. Concrete has achieved its seven day design strength and then inserts installed. C. The inserts are precast and concrete has achieved its seven day design strength. D. The proper inserts are installed correctly and concrete is strong enough. 45. For which type of grout is it most critical to build tight and well fitted forms? A. Epoxy. B. Non-shrink. C. Gas expansive. D. Drypack. |