Restruction Corporation completed overhead concrete repairs in a mechanical room. The team encountered a few challenges in completing this project; access equipment in the way, piping and electrical conduits that required our crew to work around, and capturing the debris and dust from to prevent contamination of the mechanical room. Scaffolding was installed with a work platform, plastic was used to contain the debris and dust. The repair area is marked for saw cuts in the concrete, remaining concrete is removed, rebar is cleaned and coated, holes were drilled to install fiberglass through rods to hold the form in place, and larger holes were drilled to pump SCC-self consolidated concrete from the top outside surface.
Here is the top side during placement. Holes are cored and drilled to track the flow of the SCC mix and allow passageways for the air to escape during placement. The picture of the pressure gauge shows a pretty consistent pressure of 40 psi during placement. Pumping the SCC mix allows for us to pressurize the forms during placement.
This is a picture of the repair area after the initial placement. Now that the forms have been pulled we will cut off the fiberglass through rods (which were used because they are non-corrosive), and grid the edges and pump holes of the repair to look good.