eli5. when concrete powder gets wet it becomes a paste but when it drys and you pour water on it it stays the same?
In: 7
We take rocks and heat them up till they glow red hot. It takes all that heat to chemically separate the water that’s bound in those rocks (clinker) to make cement. Mix that cement with sand for filler and you get concrete. When that concrete gets wet, the cement part of it turns back into the rock stuff it was made from.
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