- 1). Pre-drill 1-inch holes every 12-inches along the side of 2-by 6- lumber. Lay 2-by 6 lumber to create the length and width of the project, place 2-by 6 lumber directly on the sandy ground; these are the forms that will hold the concrete in place. Lay pieces of lumber across the width of the form so each box within the box is no larger than 6-feet by 6-feet. Wait for low tide to build wood forms, which are bottomless boxes.
- 2). Use a sledgehammer to drive 2-foot lengths of rebar through the pre-drilled holes penetrating the sandy surface to hold the forms in place. Rebar is a thick metal rod.
- 3). Follow the bag directions carefully to mix specialized seawater manufactured concrete with an aggregate content impervious to salts, in a large trough or wheelbarrow--or schedule a delivery, depending on the size of the project. This type of concrete is available at masonry supply houses or via concrete delivery companies. The concrete mix is thicker than traditional concrete and has a lower air volume.
- 4). Bail water from the forms with a bucket or a submersible pump.
- 5). Pour the concrete mixture into the forms directly from the concrete truck feed or tip the contents of the wheelbarrow allowing the concrete to flow out.
- 6). Use a bull-float, which is a large trowel at end of a pole, to smooth and level the concrete.
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