Concrete Applications

1. Concrete Applications Jeff Crowder January 14, 2005

2. Objective Know the difference between cement and concrete. Be able to accurately calculate the amount of concrete needed. Correctly name and identify concrete tools.

3. Cement vs Concrete Portland Cement is powder mix. One bag weights 94 lbs which is one cubic foot. Concrete includes fine aggregate, course aggregate, and cement. Must add water. Water and Portland cement are mixed it creates a chemical action which causes the concrete to set up and become hard.

4. Advantages of Concrete Strong Fireproof Insect and weather resistant Water proof Versatile

5. Preparing for Concrete Dirt work Level the area first! Square the pad if needed. Monolithic Pour Pour the footer and slab together. Calculate D*L*W Convert inch into feet 27 cubic ft = 1 cubic yd Add a little

6. Building a form Build to the exact height of the finished structure Brace with 2 x 4 studs on 18 to 24 inch centers Material Can use lumber, plywood, metal, cardboard. Apply diesel or oil to form. Add rebar or wire to the pad & elevate. 3/8 inch rebar for a 4 inch pad. � inch rebar for a 6 inch pad.

7. Concrete Arrives Have a slump test done Direct the chute and pour Distribute evenly Use Come-A-Long Screed the Concrete Use a 2x4, is a rough finish Tap form to prevent honeycombing

8. Finishing Concrete Use Jitter Bug on only low slumps High slumps course aggregates sink naturally Floating Bull Float- Aluminum Magnesium Draws water to the top and levels. Fresno- Steel Seals the surface Troweling Produces a hard, smooth, surface Done immediately after floating

9. Edgers Produce a radius along the slab edge slab Perform edging after the bleedwater disappears Hand floats Remove imperfections and produces a flatter surface Compacts the slab and the mortar at the surface Do after the edging Power Trowel Last step finishing blades provide a final, professional finish

10. The Cure Is the time it takes for concrete to set up. Cold weather add a blanket to surface Hot weather add a plastic to surface Wait about 24 hours to break apart forms Use carpenter nails.

11. Guided Practice A monolithic pour with Slab is 6� X 20� X 40� 1� X 1� Footer Figure Slab .5�*20�*40�=400� Figure Footer 40�+40�+18�+18�=116� .5�*1�*116�=58� Add and Convert to yards 400�+58�=458� 458�/27�=16.96yds Round to 17.25yds

12. Independent Practice