1. Concrete Lesson 2: Site Preparation
Ag Structures
Mr. Dieckhoff

2. Soil Work………It’s Not for Everyone……

3. Preparing a Subgrade Drainage Removal of Topsoil
Removal of organic matter
Removal of rocks and stones

4. Preparing a Subgrade Subgrade slope – 3% Packing or compacting
Sand or aggregate fill
Install Vapor Barrier
Dampening the site

5. Vapor Barrier
Plastic-coated paper and polyethylene film have low perm ratings and are often used as vapor barriers.

6. Footing Large supporting blocks between the foundation and the soil
Used to support the weight of the structure
Must be placed below the frost line
Place on aggregate base to prevent movement over time

7. Laying Out the Pour Lab In Groups of 3 people…..
Create 4 stakes you can hammer into the ground using a 2x4 (see first video)
Stake 2x4s into the ground so you have a 3x3 form without using screws or nails
Check to make sure the perimeter of the form is square. Also make sure the diagonals are equal.
Check to make sure the top of the forms are level.

8. Reinforcing Concrete Rebar Wire Mesh
steel rod containing lugs (protrusions) that allow it to interlock with concrete.
Wire Mesh

9. Tying Rebar Lab

10. Review
Preparing the Subgrade
Footing
Laying Out the Pour
Reinforcing Concrete

11. Quiz – 10 Points (2 pts each)
1. The large support blocks under the foundation of a structure are the:
Bases b. Footings
c. Sills d. Underlayments
2. The layer of polyethylene sheeting over the subgrade is called a:
a. Vapor barrier b. Sub-seal
c. Floor wrap d. Soil seal
3. Which of the following factors should be focused on when preparing the final grade? a. Removal of rocks and stones b. Subsurface water c. Slope d. Removal of topsoil 4. Why is subgrade slope important? 5. Why is organic material removed from a site?