Hello Siddes, please reframe your question very well because it is really not understandable. The clearer it becomes, the more answers you are likely to get. Thank you.
If you mix cement with water and you don't use within 30 minutes it will be useless or it will be very hard and you can't use any more.
the cement gets almost hydrated within a short time. we can use the hardened cement as fine or course aggregate after crushing. there is not other use.
I know that the cement become hardened but use any chemical if we break a bonding in between to the cement and water and recycle the cement?
Once hydrated, cement can not be re-used to achieve the properties of the original material, because the hydrating power is almost used up. However, there are new approaches to recycle sludge; such as powder compaction techniques (after the sludge is dried).
In principle, the hydration reactions are irreversible, and that's why it is advised to keep unused cement in dry areas.
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