Yes, you can put new concrete on old concrete as long as there are no problems such as significant cracks or frost elevations with existing concrete. A new layer of concrete should measure approximately two inches to ensure even and strong coverage. The simple answer is YES, new concrete can be poured over existing concrete. Can pour concrete on concrete.
However, if there is any damage to existing concrete, these problems can carry over to new concrete. We've already taken the jack out of the bag and said that concrete can be poured onto concrete, so the quick answer is yes. However, before you go out to pour a new layer of concrete over the existing layer, you will need to check the condition of the old slab. If there are any signs of damage to the old concrete, you will need to address the faults before pouring a new layer.
While you can pour concrete onto concrete, you'll need to use a bonding agent with the new concrete because the cement inside the concrete doesn't have its own. Adhesive agents help concrete adhere to a surface, including old concrete. Without this aid, pouring a new layer of concrete will result in two separate layers. The new concrete layer sits on top of the old layer but does not melt, making the material weaker than the original layer.
Can pour concrete over existing concrete. It is an ideal solution for weathered or settled concrete, as long as it is structurally sound and the added thickness does not pose a problem with openings and drainage. Structurally solid concrete may have cracks and chips or have chipped over time. Adding a layer of concrete on top will breathe new life into an old surface.
Bending cracks (bending or settling cracks) usually run vertically through concrete and along stress zones. Cracks can also occur if the reinforcing bar begins to corrode due to moisture or chemical reactions in concrete expanding from the inside of the mass. Many people will tell you that you should only replace concrete instead of re-paving, but it may not need to be replaced. However, unresolved issues with old concrete, such as cracks or frost, will carry over to new concrete if left unresolved.
As mentioned above, the new concrete layer is only as good as the existing layer below, so be sure to repair the cracks below and separate the two layers. In each of these situations, you must remove old concrete, resolve the existing problem, such as removing tree roots, and continuing with new concrete. Pouring a new layer of concrete over an existing walkway, patio or porch will raise the level by several centimeters. The studded face of the old concrete is treated with a bonding material to facilitate the fusion of old and new concrete.
Consider these factors when debating whether to pour new concrete over the existing layer or remove the old tile and start from scratch. Pouring onto existing concrete exposed to vehicular traffic is also being carried out in road, driveway and parking projects. Preventing new concrete from adhering to the existing slab helps prevent new damage from forming and any damage to the old slab from spreading to the new one. Once you have determined that the old concrete is structurally sound and that there is enough space to pour the concrete over the concrete, it's time to take action.
The new concrete will fill the pothole completely when it is cool, but will shrink quickly from the edges as it settles. When redesigning your backyard deck or driveway, you may wonder if you can simply pour a new layer of concrete over the old layer. If you ripped out old concrete and replaced it with new, well-poured concrete, you could save yourself a lot of trouble by maximizing the life of your concrete. Old concrete is dry and will draw moisture from the new one, altering the water-to-cement ratio and weakening the spill.