If an existing concrete surface has laitance (a dusty layer of cement and fine aggregates), or has been contaminated with spillages such as oil or grease, then the bonding agent won’t work well. The new won’t adhere to the old without the help of a bonding adhesive. This is also true of floor repairs, if concrete is used to fill gaps caused by damage. This will not produce a strong, serviceable floor.Ī bonding agent (bonding adhesive) needs to be painted onto the existing concrete first to ensure that the fresh concrete will successfully adhere. Once cured, the new concrete will simply sit on top as a separate layer. The cement within a concrete mix doesn’t contain any natural bonding agents – so when fresh concrete is added on top of an existing layer of concrete, the two won’t join together. Why you need to use a concrete bonding agent One solution is to add fresh concrete on top of the old surface. It’s also wasteful if the floor is still structurally sound. Removing the entire floor and re-pouring is costly, both financially and in terms of time. When a concrete floor surface becomes damaged there is usually the choice of either demolishing the floor and starting again, or resurfacing the existing concrete.
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