per my other thread, I've noticed something with the increased melt we've
got. the rough, unfinished concrete on either side of my trench drain is
basically dissolving into concrete coloured sand!!! I can take my bare
finger and poke into it.
what causes this??? it is literally vapourizing and completely
disentigrated! basically well formed mounds of sand now....same goes for
the forming that held the rails in place. I can scrape it away with a pain
any thoughts on what caused this, and ideas on how to prevent MY repair from
doing the same in 1 season??
Poor mix. I assume it was commercially mixed so too little or
improper mixing is unlikely. Sand, gravel, cement, water ratio wasn't
correct. I personally wouldn't use anything but 6 sack cement (6
sacks per cubic yard) for anything around my house, and yours may have
been as little as 2-1/2 sack. Contractors often skimp for very little
savings. For the home owner, nothing less than 5 sack should be used
and the cost of another sack to make it 6 sack is minimal. Or, too
much water was used. Workers sometimes add a lot of water to make
working the mixture easier. A stiff mixture will be much stronger.
Then, the curing may have been wrong. The mix may have frozen or it
may have dried very quickly. Most likely it was a combination of too
much water and failure to cure properly.
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