Posted by Billy NY on April 29, 2014 at 21:21:44 from (66.67.105.23):
In Reply to: Re: Concrete questions posted by Brad Buchanan on April 29, 2014 at 19:04:30:
That is interesting, lot of variables to consider, but they are different, one with an admixture, one without. Might be a chemistry thing, the difference, but the resonation difference, air entrainment different between the 2 mixes? There are tiny little voids, concrete does have capillaries, and is porous, perhaps the structures of these differ in size and each creates its own sound ? I've never really wondered about the acoustical qualities of concrete beyond the structure it forms except how sound attenuation is achieved with the architectural finishes used inside. One never thinks about the sound of concrete when struck. First guess would be density, or large aggregate which is source specific. Lightweight concrete specifications call for a lighter aggregate, such as Norlite, which is a specific shale mined just across the river from here. Its cooked, heated to a high temperature, expands and is porous, very light, kind of like sedimentary popcorn LOL ! I would bet a regular weight and the lightweight would sound very different when struck.
5000 psi is some strong material, and I forget where they are with the highest PSI concrete today, but recall years back in engineering news record where they had just reached 18,000 psi, which is hard to imagine, but has been achieved on WTC one.
Yes, its definitely in all the 03300 specifications on jobs I've done, you can't let it free fall past a certain distance. When in the excavation/foundation stage of a large job, or any for that matter, you have to be on the lookout for all these kinds of things with contractors. Put faulty material in these locations by mishandling and you have a real disaster on your hands once you put enough weight onto it. This material has a lot of rules to abide by.
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