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In page Concrete:
"Workers who cut, grind or polish concrete are at risk of inhaling airborne silica, which can lead to silicosis.[7] This includes crew members who work in concrete chipping. The presence of some substances in concrete, including useful and unwanted additives, can cause health concerns due to toxicity and radioactivity. Fresh concrete (before curing is complete) is highly alkaline and must be handled with proper protective equipment.
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