What term describes voids or cavities formed in concrete due to insufficient vibration?

The term that describes voids or cavities formed in concrete due to insufficient vibration is honeycombing. Honeycombing occurs when there are large air voids left in the concrete mix because the particles are not properly consolidated. This can happen if the concrete is not vibrated adequately during the placing process, leading to incomplete filling of the formwork and creating irregular spaces within the concrete.

In addition, honeycombing can negatively affect the durability and strength of the concrete, as these voids can lead to a reduced load-bearing capacity and increased permeability, making the concrete more susceptible to environmental damage. Effective vibration ensures that the concrete mix is densified and that the aggregate particles are properly seated, which prevents the formation of these harmful voids.

While terms like segregation, cracking, and dusting refer to other issues in concrete quality and finish, they do not specifically denote the presence of voids due to insufficient vibration. Segregation involves the separation of aggregates from the cement paste, cracking is related to fractures in the hardened concrete, and dusting refers to a powdery surface layer caused by improper curing or finishing methods.