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TRANSCRIPT
Name: Date: Binder #:
Concrete Guided Notes
Objective A: Explain the composition and characteristics of concrete
Concrete is a mixture of 4 items:
Cement and water harden and fuse the aggregates together into a substance.
Advantages of Concrete
Disadvantages of concrete
Agricultural uses of concrete
Ingredients in concrete
-No in sand or gravel
-Clean water with no
-Mixed in a - - ratio
-1 part , 2 parts , 3 parts
-Different for different jobs or types of aggregate
-Water
-Add water and thoroughly
-if mix is crumbly -
-if mix is soupy -
Objective B: Place concrete
Calculating concrete needed
-Sold by the or “yard”
-Cubic Yards =
-T is -W is -L is -27 is
-Order a little extra-
-I want to pour a 10’ by 12’ 6 inch pad, how many yards do I need?
◦ .5’ x 10’ x 12’ = 60 cubic feet
◦ 60/27 = 2.22 cubic yards
-How many yards if:
-4’ x 8’ 4 inch pad = -20’ x 50’ 6 inch pad =
Concrete Forms
-Forms hold in the desired shape and location until it .
-Commonly or .
- forms so they aren’t moved out of place
-Wood or metal stakes nailed with
-Coat forms with oil to prevent sticking
-___________ of form will determine the top of the cement slab
-Use a ____ on the form to create the desired of the slab
-Base inside the form should be or compacted firmly
-Forms can be removed after concrete
Reinforcing Steel
-Steel rods or wire added to increase
-Called
-Place in a
- ____ or___________ together where they cross for strongest reinforcement
-Should be in __ of slab vertically and not too close to
Concrete Tools
1. 2. 3. 4. 5.
6. 7. 8. 9. 10. 11.
Placing concrete
- so water doesn’t leave concrete too soon- Have everything ready - - and work continuously to the other side- Concrete is very heavy
Striking off ( )
-Rest straight board (screed board)
- across top of forms in a sliding motion
-
- on unleveled side can drag concrete to low areas
-Tap form boards will hammer or use a spade between board and concrete to push
away from form
Floating
-Float is used to
-Brings and to the surface for smooth finish
- float
- , aluminum or hand float
-Done immediately after striking off
Edging
-Edger used to
-Pushes course aggregate
-Keeps edge from
Jointing
-Creating or in the concrete
-Gives
- along grooves rather than across pad
Finishing
-Creates final surface
- to set up a little then finish
-Float finish is acceptable for some areas like livestock feed areas, has
- gives some traction, pull a over surface
-Metal trowel rubbed over the surface makes a very
-Dip in to aid process
-Excessive troweling makes , may break off and crumble
- may be dragged across surface to make it less
Curing
-Proper and of concrete
-Dries too quickly, doesn’t reach
-The slower the leaves the the concrete
-Protect from , heat or
-Water can be sprayed on concrete to slow drying after it is setup
-At least 7 day wait before