No, and maybe yes.

Crystalline silica (the dangerous type) is typically NOT added into precast concrete. On the other hand, Silicon dioxide (also called micro silica, or silica fume) is added for strength, bonding, and compression strength to concrete. It is usually added at the cement factory. This type of silica binds with the portland cement and (from an inhalable particulate standpoint) is not dangerous.

However, danger lies it what ELSE is added to the precast concrete…..ROCKS!

Rocks, dirt and soil contain varying amounts of silica in the Northwest US. And, if these are broken, ground, chipped, hammered, they can become airborne….which allows the crystalline silica to be released and THAT is dangerous.

Always use wet methods when working with precast concrete.