theywork well as long as you can get the existing concrete clean enough
Some alternative solutions for the Gila application include exploring different software options, customizing the existing application to better fit the needs, or outsourcing the development to a third-party vendor.
Radiant flooring is an option if one has an existing concrete floor. The radiant flooring system is installed underneath the concrete floor to heat the concrete.
No do to the concrete settling the concrete on top would split
You must form on top of the existing slab and drill in anchors to join the new concrete to the old this is called a cap
Want to replace an existing subsided external concrete step.
In basic terms, you can not. you can strengthen a reinforced concrete beam by application of a steel plate/frp up to a point where the area in the stress block under compression is at a max. allowable limit as stated in the code you are using. At this stage, the concrete is close to a crushing instantaneous failure and the beam can not be strengthened further.
paint or acid etch
Easy modifications of existing solutions
To build a patio cover on existing concrete, you can use anchor bolts to secure the cover to the concrete. First, measure and mark the placement of the cover on the concrete. Then, drill holes for the anchor bolts and attach the cover frame to the concrete using the bolts. Finally, install the roofing material to complete the patio cover.
To add a concrete step to an existing slab, you will need to prepare the surface by cleaning it thoroughly and applying a bonding agent. Then, build a form for the step, pour concrete into the form, and level it. Allow the concrete to cure properly before removing the form and finishing the step as desired.
in between existing concrete and the new concrete you need to place an expansion joint in between the two.
It would always be best to remove the existing, but sometimes it is cost prohibitive. To pour a slab over an existing slab, especially if it is uneven or fractured, will cause weak points in the new slab for various reasons. If you're going to do it anyway, try to make sure the new slab is minimally 3" thick at the thinnest point of the formed area. Commercial solutions are available also to aid in the adhesion of new concrete over old. These products are available at most home stores.