Stan, I'll look it up Monday when I get to work, I have several concrete manuals at my desk that I've used over the years. I would think that if you assumed all the material that was in clumps was a certain percentage by weight of the total concrete in the mixture you could figure out the percent of compressive strength lost compared to total possible strength. That is assuming the clumps were broken enough to not create actual large physical voids. I have some lab people I can ask also if no one comes up with satisfactory answer this weekend. Tom B.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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