What does the term 'concrete adhesion' refer to?

Concrete adhesion refers to the ability of concrete to bond effectively to various substrates or reinforcing materials. This bonding is crucial in ensuring the structural integrity and durability of concrete structures. Strong adhesion helps to prevent delamination, where layers of concrete may separate, and contributes to the overall performance of the concrete in various applications, such as in reinforced concrete where it must adhere well to steel rebar for maximum strength.

The importance of adhesion is evident in many construction scenarios, such as when pouring new concrete over existing surfaces or in the context of repairs. Proper surface preparation can enhance adhesion by removing contaminants and providing a rough texture for the new concrete to grip onto.

The other choices refer to different characteristics or properties of concrete but do not capture the specific meaning of concrete adhesion. The resistance to environmental wear pertains to concrete durability, thermal expansion properties relate to how concrete reacts to temperature changes, and the capacity to absorb water is about concrete's permeability rather than its bonding capabilities.