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. 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. When using a liquid adhesive agent, paint the adhesive onto existing concrete and allow it to dry until it is tacky. After the adhesive has become tacky, apply a scrape coat as described above, and then apply the repair material. You can add new concrete to an existing concrete slab if the old concrete is in good condition.
You will need to thoroughly clean the old concrete surface and use a suitable concrete bonding agent before pouring the new concrete to meet all structural requirements. Start by carefully sweeping away all loose stones and dirt and rinsing the concrete to prepare the surface. There are so many concrete adhesives on the market that you can choose from to offer effective gluing functions. This is also the case with floor repair and maintenance, where concrete fills the gaps resulting from damage. Concrete is very heavy and has immense compressive strength, but it has no qualities that naturally bond with other materials. Unfortunately, there are some disadvantages to pouring new concrete over old concrete.
A big problem would be 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. However, if the old concrete is not in good condition, it will significantly reduce the life of your floors over time. You can use reinforcing bars to fix the new concrete to the old one if you want to prevent it from cracking. Use the bars to reinforce and support the joint between the slabs.
A bonding adhesive must first be painted over the existing concrete in order for the fresh concrete to adhere properly. If an existing concrete surface has grout (a dusty layer of cement and fine aggregates) or has been contaminated with spills such as oil or grease, the bonding agent will not work well. If necessary, you can end up spraying a curing compound immediately after pouring the topcoat to preserve moisture in the concrete. This will help ensure that your new layer of concrete bonds properly with your existing layer of concrete. In conclusion, when bonding new concrete to old concrete, it is important to take all necessary steps in order for it to be successful. This includes investing in a strong bonding agent, cleaning and preparing the surface, using reinforcing bars for support, and spraying a curing compound after pouring.
With these steps taken into consideration, you can ensure that your new layer of concrete will bond properly with your existing layer of concrete.