What type of damage can occur if internal vibrators are not suitable for epoxy coated rebar?

Using internal vibrators that are not suitable for epoxy-coated rebar can lead to damage to the epoxy coating. The vibrators need to be designed specifically to minimize the risk of damaging the coating while effectively consolidating the concrete. If the vibrators are too aggressive or not compatible with the epoxy coating, they can cause abrasions or even removal of the coating, which undermines the protective properties that prevent corrosion of the rebar.

The integrity of the epoxy coating is crucial because it serves as a barrier against moisture and chemicals that can lead to rebar deterioration. If the coating is compromised, the rebar is exposed to potential corrosion, resulting in longer-term structural issues.

On the other hand, while structural failure, increased setting time, and reduced strength of concrete could be significant issues in other contexts, they are not the direct consequences of using inappropriate internal vibrators specifically regarding epoxy-coated rebar. The focus here is on the adhesive properties and protective layers provided by the epoxy coating, which are sensitive to physical damage from inadequate vibratory equipment.