It is amazing to see how things have changed in just a few weeks on the Carrington site. In the last blog the concrete crew was working on the containment area walls and now the concrete is well on it’s way to being done. So let me catch you up to where we are now. The next thing to install was the floor of the containment area. This started by back filling against the walls on the inside to bring the engineered fill up to grade. Next the area is covered by a vapor barrier to keep moisture in the ground.
After the vapor barrier is laid out and cut to size the re-bar has to be installed. Putting the re-bar in place is a process that takes some time to accomplish. The concrete in this tank area will be 2 foot thick. In the picture below you can see red bricks on the vapor barrier. These bricks are for spacing the re-bar up off the vapor barrier so the concrete can flow under the re-bar encapsulating it into the concrete.
This containment area has a double mat, which means they start out with the bottom layer in the picture above, then bend spacers out of re-bar to support the top layer. The re-bar has a 6″x 6″ cross pattern. Now that is a lot of re-bar! On the area to the left there will be six tanks installed and just one of those tanks will weight 648,000 pounds when filled with product.
In the picture below along the wall you can see a silver A shaped unit. This is a truss screed. Trusses come in sections, ranging from about 2 to 10 feet long, which interlock to span the required distance up to a maximum of about 60 to 75 feet, depending on the particular machine. The truss sections can be set at an angle to produce crowned or invert profiles. In the middle is a motor and when running it will vibrate the truss thus knocking down the stone in the concrete and leaving a smooth surface. Out on the ends of the truss there are small electric motors with cables that are attached to the opposite wall and when turned on the cables pull the screed.
After all the concrete is poured the crew will wait for the concrete to harden a bit then get on it with a power trowel. Below you can see this company has walk behind power trowels (next to wall) and ride on power trowels. There are also trowels you use by hand but with a project of this size you bring out the big equipment.
Now that the tank containment area in complete it is time to start the load out portion of the building. The same process (in previous blog) is repeated with the walls so, here are some pictures for your viewing pleasure!
This is where we leave off for right now but don’t worry there is more to go! Next up load out floor and tank install!