Concrete is a strong and durable material, but it has no natural bonding agent or adhesive. This means that concrete alone does not adhere or stick well to other concrete material. When you place concrete on top of another layer of concrete, it will stay there as a separate layer without joining. It will not produce a strong or useful floor. You can add new concrete to an existing concrete slab if the old concrete is in good condition.
To do this, you must thoroughly clean the old concrete surface and use a suitable concrete bonding agent before pouring the new concrete to meet all structural requirements. However, there are some disadvantages to pouring new concrete over old concrete. One of the biggest problems is that it can reduce the useful life of the area. For example, a new concrete building on a new gravel base will ensure that the structure is robust and can last up to 40 years. But if the old concrete is not in good condition, it will significantly reduce the life of your floors over time.
The two pieces of concrete will not make a perfect bond; however, following the instructions correctly and using a suitable bonding agent will make the concrete strong and sufficiently bonded. If you don't want the concrete to stick to the wood, you'll need to use a mold release agent to make removal easier. This bonding agent will be painted over the old concrete to ensure that the new concrete adheres successfully. The patch or area where new concrete is added will rise compared to the rest of the house. Joining the new slab to the old slab involves creating a joint that structurally connects the two while providing a flex point for the two pieces of concrete to respond to weather and other external manipulations. Then, if you want to patch the concrete, apply a thin layer of cement paint, pour a well-mixed concrete patching mix into the holes and clean the surface with a wooden float.
If you need to patch a concrete surface or pour new concrete over old concrete, you should invest in a strong bonding agent and a concrete patching mix. The most effective way to ensure that the bonding agent enters existing concrete is to apply it directly with a brush or rag. While it is possible to use old concrete as a base for new concrete, many factors will determine whether the concrete is strong enough to accommodate the new batch. When you pour wet concrete onto dry concrete, it will dry as a separate layer, but it will not stick. Start by carefully sweeping away all loose stones and dirt and rinsing the concrete to prepare the surface. The reason you try to bond concrete to concrete will determine the best method for your project.
To prevent concrete from sticking to these materials, you should treat them with a mold release agent to prevent the concrete from sticking by forming a thin lubricating film on the material. When using a liquid adhesive agent, paint the adhesive onto existing concrete and allow it to dry until it is tacky. If necessary, you can end up spraying a curing compound immediately after pouring the topcoat to preserve moisture in the concrete.