- - AGRICULTURE CORE CURRICULUM - - (CLF2000) Advanced Core Cluster: AGRICULTURE MECHANICS (CLF2500) Unit Title: CONCRETE/MASONRY ____________________________________________________________________________ (CLF2549) Topic: UNIT EXAM Time Year(s) 1 Hour 1 / 2 / 3 / 4 ____________________________________________________________________________ NAME: ____________________________________ DATE: ____________________________________ PERIOD: __________________________________ UNIT EXAM: CONCRETE AND MASONRY Circle the best answer. 1. Concrete is a mixture of sand, gravel, water, and _____? a. clay cement b. finishing cement c. finishing lime d. portland cement 2. The strength and durability of concrete are dependent on the: a. purity of water b. ratio of stone aggregates by size c. type of cement d. all of the above 3. To prevent forms from sticking to the concrete, they are treated with: a. fat b. paint c. diesel oil d. wax 4. Concrete is reinforced with: a. air bubbles b. steel bars c. wood fibers d. aluminum wire 5. Concrete is cured by: a. covering with plastic, straw, etc. b. protecting from wind c. sprinkling with water d. all of these 6. A standard sack of portland cement contains: a. 94 pounds b. 90 pounds c. 1.5 cubic yards d. 1 cubic yard 7. The process of "striking off" the excess concrete to match the top edge with the form is called: a. troweling b. brooming c. floating d. screeding 8. After screeding concrete, what tool is used for floating? a. Straight Edge b. Broom c. Magnesium Float d. Finishing Trowel 9. The groover or jointer is used to cut joints in concrete slabs while the edger is used to round off corners. a. True b. False 10. When using a mixer, load all the coarse aggregate and all the specified water with the mixer stopped. Then follow the remaining steps as indicated. a. True b. False 11. Concrete is finished with a steel trowel: a. after the water sheen has disappeared b. after the surface has dried c. immediately after the second floating of the surface d. immediately after the concrete is poured 12. The presence of organic matter and silt in the water or aggregates used in concrete does not reduce the strength or durability of the concrete. a. True b. False 13. When working with concrete, which step comes first? a. Screeding b. Tamping c. Floating d. Troweling 14. An acceptable range of slump for general purpose concrete used in an agricultural situation is: a. 2" to 8" b. 6" to 10" c. 1" to 3" d. 3" to 6" 15. To obtain a non-skid finish that will assure the best traction, use a: a. bull float b. broom c. wood float d. steel trowel 16. If the sand to be used in concrete is considered "wet": a. more water should be used in the mix. b. less water should be used in the mix. c. more gravel should be used in the mix. d. none of the above. 17. The strength of concrete is determined by the ratio of: a. water to sand b. cement to gravel c. sand to gravel d. water to cement 18. The maximum size coarse aggregate to be used in a wall is: a. 1/4 the wall thickness b. 1/5 the wall thickness c. 1/3 the wall thickness d. 1/2 the wall thickness 19. In a 1 : 2 1/4 : 2 3/4 mix ratio, the one (1) refers to the proportion of _______. a. water b. coarse aggregate c. fine aggregate d. cement 20. In the cement ratio 1:2:3, the amount of fine aggregate would be: a. three times the amount of cement b. two cubic feet c. two times the amount of cement d. three cubic feet21. Which of the following tools is most appropriate for squaring forms for a large concrete slab? a. Carpenter's square b. Try squarex c. Surveyor's level d. Tape measure to lay out a right triangle 22. One cubic yard of concrete is equal to: a. 3 cubic feet b. 9 cubic feet c. 27 cubic feet d. 144 cubic feet 23. The actual size of a standard concrete masonry block is: a. 7 3/8 X 7 3/8 X 15 3/8 b. 7 5/8 X 7 5/8 X 15 5/8 c. 8 X 8 X 16 d. 8 3/8 X 8 3/8 X 16 3/8 24. A six gallon paste mix should contain 6 gallons of water per sack (cubic foot) of: a. concrete b. cement c. sackrete d. mortar mix 25. ______________ is a mixture of sand, portland cement, water, and finishing lime. a. Sackrete b. Concrete c. Mortar d. Grout 26. Drinking water generally is suitable for mixing concrete. a. True b. False 27. ______________ is made by burning limestone and clay, then grinding the mixture to an even consistency. a. Fine aggregate b. Grout c. Mortar d. Portland cement 28. Concrete allowed to cure for one month will be about twice as strong as concrete which is allowed to dry immediately. a. True b. False 29. Fine aggregate in concrete must be no larger than: a. 1/8" b. 1/6" c. 1/4" d. 1/2" 30. How many standard size blocks will it take to lay a 16 foot wall that is 2 feet high? a. 30 b. 36 c. 40 d. 42 31. How many cubic yards of concrete must be ordered to pour a 4 inch slab for a 24 foot by 27 foot shop floor? a. 8 b. 27 c. 216 d. 2592 (NOTE: To complete the rest of the test handouts covered in the previous lessons must be given to the students.) A concrete driveway is to be poured on a level surface. The concrete is to be ordered from a "batch" (Ready Mix) plant. The dimensions of the slab are: 6 inches thick, 16 feet wide, 54 feet long. Allow 5% overage for uneven surface of the ground. SHOW ALL YOUR WORK! 32. How many cubic feet of concrete are needed to complete the job? ________________ cubic feet 33. How many cubic yards should be ordered? (Round off answer to nearest 1/4 or 1/2 of cubic yard.) ________________ cubic yards 34. Specify the maximum size of aggregate. ________________ inches 35. Specify the proportions desired for a one sack batch. _____________ : ____________ : _____________ CEMENT SAND GRAVEL36. Specify the amount of cement needed for 1 cubic yard of concrete. ________________ sacks 37. Specify the water - cement ratio used for the job at hand. ________________ gallon paste 38. Specify the amount of slump. ________________ inches 39. Calculate the Ready Mix cost. ($55.00/Cubic Yard) $ ________________ 40. Now that you are experienced masons, you can go out and pour some cement on your own! Right? a. True b. False 7/19/91 JPD/tf #%&C