It's easy to picture the situation of using gravel sized clumps of hydrated cement, and how they would form actual voids or, at best, pockets of a substance with less strength even than sand. What I can't get a clear idea of is what it would do to the concrete to contain a proportion of pulverized---to the point of appearing as fine as fresh cement---fully hydrated cement, not as the only cement in the mix but, let's say, as an addition to the required amount for the desired mix, or as a small (< 20%) portion of the total cement. Would it create concrete that was microscopically honeycombed with either voids or pockets of no strength material? In the past I've treated the addition of a small amount of reconstituted cement (to a mix that would be adequate without it) as an action that would either improve the strength of the concrete, or at least not hurt it. I would feel dismay, chagrin even, to discover that my efforts had not only been pointless, but had actually made the situation worse.
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