Normally you would jackhammer the old concrete out and do it right.
Pour concrete on existing concrete floor.
If you are laying pouring concrete over existing concrete there needs to be a bond.
Pour a floating concrete floor.
Step 5 pour the concrete over the old floor and spread it over the surface with a rake.
The thickness of the slab is designed.
Pouring concrete over existing concrete sidewalk when pouring new mix over old concrete make the mixture stiffer than usual by adding less water.
Prepare enough concrete to pour a 1 to 2 inch layer over the old floor.
You just have to consider the added height.
The measurements acquired can then be used to estimate the amount of concrete required.
When i say bond the concrete you are lying on top off needs to be a rough finish like scabbled.
So here is a basic process for pouring your concrete floor.
When laying new concrete over an existing slab it s important to separate the two layers.
We had a building that had an existing concrete floor that was poured directly on the ground.
This is because if the new layer is poured directly onto the existing slab the two slabs will bond together.
Depending upon the requirement of the preferred use of the slab and the loads coming upon the slab.
In a concrete mixer add cement aggregate sand and water as directed on the concrete package instructions.
Measure the perimeter of the area to pour the concrete over the existing slab.
Clean your existing floor.
Over the years it had cracked.
Sweep your existing floor clean from dirt and debris.
The cleaner it is the better bond you will achieve with the new concrete.
Spread the new concrete over the surface filling the entire area within the form you created.
Pouring concrete over an existing concrete driveway or sidewalk the same principles as above apply to pouring concrete over an existing concrete driveway or sidewalk.
You could drill holes into the existing concrete surface and insert steel pins and then the mesh on top.
If the slabs bond together any cracks or damage in the old surface will spread to the new surface.
Let s assume that you re pouring over an existing cement floor and that there will be no height issues by your doors.