What type of heads should internal vibrators have when used with epoxy coated rebar?

When using internal vibrators with epoxy coated rebar, it is essential for the vibrator heads to be made of rubber or non-metallic materials. This is primarily because metallic components can potentially scratch or damage the protective epoxy coating on the rebar. Epoxy-coated rebar is designed to provide corrosion resistance; any damage to this coating can compromise its effectiveness and result in exposure of the underlying steel to corrosive elements.

By using rubber or non-metallic vibrator heads, the risk of such damage is significantly reduced, ensuring that the integrity of the epoxy coating remains intact during the concrete placement process. This approach not only promotes the durability of the rebar but also enhances the overall lifespan of the concrete structure being constructed.

Other materials, such as metallic, plastic, or wooden heads, can either cause damage to the coated surface or lack the necessary durability and flexibility that rubber or non-metallic options offer in this context. Thus, the choice of rubber or non-metallic heads is critical for preserving the quality and performance of epoxy coated rebar in concrete applications.