Surface voids
What are surface voids?
With upcoming trends like industrial living, producers of (precast) concrete had to set a new level of finishing to the concrete... a smooth concrete surface without surface voids. These surface voids, also called air bubbles or pinholes are small holes that have an undesirable effect on the concrete surface. In extreme cases we speak about blowholes and not from air bubbles.
It's understandable that this is one of the biggest challenges in the concrete precast industry.