Reinforcing steel is made from scrap metal. This is great, because it means that a lot of "waste" is reused. Good for the environment. When you work with recycled material, you have to deal with impurities in the rebar.
Betonstaal.nl contributed to a study of impurity levels in which impurities in steel scrap were compared internationally.
You can read what the study revealed and what the conclusion was here.
