On 10/23/14, 6:01 AM, Brian Amos wrote:
I would ask your friend where he got his civil engineering degree. I would
be interested to know. Bad, bad, bad idea, unless you know what you are
doing (he doesn't).
One doesn't need a degree to know that this is a bad idea. And not just
because it violates the "do what the plans say" rule (aka LXC prime
directive)
The education would allow you to do:
1) know *why* it's a bad idea
2) potentially turn a bad idea into a good idea, with some extra work
(as you outlined later)
3) explain why one person doing it once might get lucky, but that
doesn't mean you should do it. anecdote is not data.
As far as grinding and reusing, I drive by a freeway rebuild every day
and they are grinding up the old concrete to make new roadbed and
aggregate for the new concrete alongside the road. From a very, very
casual inspection of the equipment (traffic doesn't move that fast
sometimes, so you can watch the processing at your leisure), it looks
like they're turning it into 1" or so gravel as well as a pile that is
much finer. I was wondering whether this grinding, sifting, and grading
process is actually making chunks of concrete, or more about reclaiming
the original aggregate gravel, after removing the cement matrix around it.
In this particular case, I haven't seen them making the concrete from
the piles (although I'm sure they do, I've seen it on other projects,
other freeways), but a lot of what that huge pile of "gravel" is used
for is the substrate underneath the new concrete, and I suspect that the
requirements for that material may not be as stringent as for the
aggregate going into the concrete for the actual road.
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