I'll appreciate the information. Be sure to note that the situation I'm describing is one in which I'm using the correct amount of uncompromised cement for the desired mix, but adding some arbitrary amount of compromised (hydrated) cement which has been mechanically re-pulverized. Billy NY's comment that the least worst case scenario would be that the additional cement would act as added aggregate, thus requiring recomputation and increased amounts of the other ingredients may come close to being the final answer. In that case, I'd be doing exactly the thing I don't want to be doing: spending time or effort to make the situation worse. Naturally, I wouldn't even want to be doing something that provided no benefit, but that would be easier to accept than finding out that I'm doing something extra which ends up hurting the outcome.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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