so are ya saying they WERE in the concrete??
I spent the last 10 minutes trying to decide if this was just trolling. Let me see if I can be anymore obvious about this. I will use small words and short sentences to improve reading comprehension.
Concrete is complex. Fly ash has many different particle compositions. When fly ash and concrete are mixed together, reactions happen. Iron microspheres in fly ash are not part of the concrete reaction. When pulverized, concrete will release those iron microspheres. Those iron microspheres are not different from other iron microspheres. The iron microspheres from building fires are the same as those from concrete. The iron microspheres from other combustion reactions are the same as those from concrete.
RJ Lee is not magic. They cannot talk to the particles and say, "Where did you come from little particle?" They know a particle comes from concrete because they know the reactions that happen. When they see iron microspheres, the don't say, "Oh my! Iron microspheres never happen! Unicorns must have pooped them out!" They also don't say, "Iron microspheres only come from fire, so they can't come from concrete." RJ Lee group is smart! They know that iron microspheres come from lots of places, and it's hard to tell where they came from.
Steven Jones is not very smart at all. He sees microspheres and say, "Only thermite makes these!" Bad Steven Jones! Bad, bad, bad! Steven Jones should go back to failing at cold fusion.
Fly ash is in concrete.
Fly ash has iron microspheres.
Ash from wood fires has iron microspheres.
Iron microspheres are also found in dust, especially in urban environments.
Iron microspheres come from many places.
Iron microspheres do not only come from concrete.
Iron microspheres do not only come from thermite.
Iron microspheres can come from concrete.
Iron microspheres can come from thermite.