The simple answer is YES, new concrete can be poured over existing concrete. Technically, existing concrete could be covered with a layer of concrete only a few millimeters thick, which is called a screed. Screeds are often used to improve the finish of existing concrete for aesthetic purposes or to prepare for other finishing operations. A good example is when installing laminate floors; this type of finish requires a flat, level floor slab.
Otherwise, the laminate floor panels will crack and deform. Concrete slabs, especially older ones, generally do not meet this standard and therefore require a screed. You can pour a new layer of concrete onto an existing concrete surface. You may want to upgrade or expand a surface, or repair minor problems such as cracks, chips, nicks, or surface discoloration.
Adding a new layer on top of the old one can save time, money and resources. Hopefully, you will better understand how to pour concrete over old concrete. For this reason, you can decide to pour a new layer of concrete simply to create a patterned pattern. When joining new concrete to old concrete, you'll need to decide the type or level of bond you want to use for the overlay.
Metal rods or mesh help fix old concrete with new concrete; thinner overlays may use mesh attached to the old platform surface, while thicker concrete would need heavier or ½ pieces of reinforcement anchored to the old platform. If there is extensive sedimentation, agitation, or cracking, I would like to investigate why you did it in the first place and correct that problem before pouring new concrete onto something like that. Make sure the braces are level and place a wire mesh barrier over the existing concrete inside the barrier. Pouring new concrete onto existing slabs is simple and efficient, as long as the existing slab is in good condition.
See what you need to know about pouring concrete onto concrete, including crucial steps, tips, and proper thickness for concrete over the concrete layer. New concrete will likely shrink at a different rate than existing concrete if mix designs are not carefully combined. Resurfacing old concrete can also create a trip hazard due to the change in height from the height of the previous surface. Partially bonded overlays mean that the new concrete goes directly onto the existing concrete with no bond or barrier between them.
Before you can pour and stamp the new concrete surface, it needs to be cleaned thoroughly, preferably with a pressure washer. The fluctuation of temperatures will cause the concrete to rise, which will cause cracks and separations. One problem is due to temperature fluctuations, which can cause the new concrete layer to separate, lift, or crack. When existing concrete is severely damaged, with large cracks going through the structure, you need to completely tear it off and replace it.
In order for it to be possible to pour concrete onto concrete, the existing layer of material must be in good condition and properly prepared.