Since we’ve last updated, we have been hard at work preparing for the first concrete pour of the project. While working with workers form the city, we have learned all about laying string lines and triangulation in order to mark where formwork for the pour have to go. Once string is set, we level the spots for the pour by using a level laser to tell us what parts of the ground are too high or too low. We then took fill dirt and piled it on higher than the bottom of the slab needed to be. this is because we then took a tamper and rode it up and down the pour area which compacts the dirt, causing it to be 3+ inches lower than it was pre-tamper.
The next step was to set up the formwork. For the turn down part of the slab, we constructed a wall using plywood and 2x4s while the rest of the formwork were specialty steel C pieces that could be wedged into the ground to hold their place. This step required more leveling in order to ensure that concrete settles at the proper height. Once the formwork was in place, we laid out a plastic vapor membrane to give the slab some protection from the elements.
Then, it was time, for the one and only, sturdy, durable, unbelievably reinforcing rebar to be placed. To do this, we had to measure out the 20′ sticks and then cut them. Cutting rebar may be the most difficult thing in the world as we quickly learned. But we slowly and surely got the hang of it. Select pieces then had to be run through the same tool but to bend them into two 90 degree angles which would be what sat in the turn down.
Once all the rebar was prepared, we put on rebar chairs on to the turn down rebar pieces. we then placed these into the space that we would pour concrete. Next, we took the piece of rebar that would be running perpendicular and spaced the at 16″ O.C. Once in place, we used rebar ties to tie together any spots that had broken rebar or overlapping rebar pieces.