FFA Agricultural Mechanics Contest
University of Missouri
50 points
Instructions: Select the correct answer and record your answer on the answer sheet.
Directions: Using the plan provided, and the concrete specifications/assumptions and recommended mixtures for concrete when answering questions 1-6.
1. How many cubic yards of concrete should be ordered for the floor of the silage pit?
Use a 10% waster factor when making your calculations.
a. 10 cubic yards
b. 11 cubic yards
c. 12 cubic yards
d. 13.5 cubic yards
2. How many cubic yards of concrete should be ordered for the walls of the silage pit?
Use a 10% waster factor when making your calculations.
a. 11 cubic yards
b. 15 cubic yards
c. 17 cubic yards
d. 18.5 cubic yards
3. Wire mesh reinforcement will be placed within 4 inches of the outside edge of the floor of the pit. You will be using a 6" mesh that is 48" wide and 150 feet long (6" * 6" * 4' * 150'). How many rolls of wire mesh reinforcement will be needed for the floor of the silage pit?
a. 1
b. 2
c. 3
d. 4
4. Rebar will be placed within 6 inches of the outside edge of the floor of the pit. You will be using a 1/2" rebar that is sold in 20 feet lengths. Assume a minimum reinforcing rod overlap of 24 times the diameter of the rebar. How many 20 foot lengths of rebar will be needed for the floor of the silage pit?
a. 2
b. 3
c. 4
d. 5
5. Concrete Sample tagged # 5 is finished properly for use as a:
a. Livestock facility floor.
b. Sidewalk.
c. Basement floor in a house.
d. Farm shop floor.
6. Use the table provided to determine the appropriate cement/fine aggregate/coarse aggregate ratio for the silage pit.
a. 1 : 2 : 3
b. 1 : 1 3/4 : 2
c. 1 : 2 1/4 : 3
d. 1 : 2 3/4 : 4
| Uses of concrete | Water(gal.) for 1 Sack Cement-Sand | Trial Batch 1 Sack Cement Plus | Space Trial Batch Fills (cu.ft.3) | Materials for 1 Cu.Yd.1~ | ||||||
| Dry | Damp | Wet | Very Wet | Sand (cu.ft.3) | Gravel (cu.ft.3) | Cement (sack) | Sand (cu.ft.3) | Gravel (cu.ft.3) | ||
| Acid-resistant, alkali-resistant;dairy, creamery floors... | 52 | 4 | 4 | 4 | 1 | 2 | 3.38 | 8 | 14 | 16 |
| Medium wear; reinforced; watertight; floors, tanks, etc....... | 62 | 5 | 5 | 4 | 2 | 3 | 4.32 | 6 | 14 | 19 |
| Medium wear, indoor, underground, no water pressure | 72 | 6 | 5 | 4 | 2 | 4 | 5.4 | 5 | 14 | 20 |
| 1To convert cu. ft. to cu.m., first convert the cu.ft. to cu.yds. by dividing by 27. Then, convert the cu.yd. to cu.m. by multiplying by 0.76 follow
this example:
2Called 5-, 6-, 7-gallon mixes, indicating that there are 5, 6, 7 gallons of water to each sack of cement, including the amount of water in the sand. | ||||||||||
Skill: Sweat Solder copper tubing
Materials needed:
Copper tubing, 90o elbow, copper tubing with one end capped, copper tubing cutter, propane
torch, striker, solder, flux, wet rag,steel wool
Directions:
1. Secure a 1/2" copper 90o elbow.
2. Cut the pipe so that it extends 2 3/4" inches as indicated on the figure below.
3. Clean the fitting and pipe with flux.
4. Place the 90o elbow on the tubing and use the propane torch to sweat solder the end cap in place.
5. Place one of your name labels on the pipe.
6. Hand the completed joint and this paper to the contest official.
Points Points Possible Earned
1. Neatness, Appearance 5
2. Passes 50 psi air test 6
3. Correct length 7
4. Safety 2
Total from problem solving 30
TOTAL PLUMBING\CONCRETE 50