what causes concrete/cement to fall apart?

Discussion in 'Misc DIY' started by Hamilton Audio, Feb 29, 2004.

  1. 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
    scraper!!

    any thoughts on what caused this, and ideas on how to prevent MY repair from
    doing the same in 1 season??

    b
     
    Hamilton Audio, Feb 29, 2004
    #1
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  2. Hamilton Audio

    RB Guest

    This may have been too much sand and too little concrete. Since
    strength wasn't the objective the installer may have saved money by not
    using sufficient cement.

    RB

    Hamilton Audio wrote:
    > 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
    > scraper!!
    >
    > any thoughts on what caused this, and ideas on how to prevent MY repair from
    > doing the same in 1 season??
    >
    > b
    >
    >
     
    RB, Feb 29, 2004
    #2
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    m Ransley Guest

    A real crappy - cheap mix, you got ripped
     
    m Ransley, Feb 29, 2004
    #3
  4. Hamilton Audio wrote:
    >
    > 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
    > scraper!!
    >
    > any thoughts on what caused this, and ideas on how to prevent MY repair from
    > doing the same in 1 season??
    >
    > b


    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.
     
    George E. Cawthon, Mar 1, 2004
    #4
  5. Hamilton Audio

    bobby swift Guest

    rock salt
     
    bobby swift, Mar 1, 2004
    #5
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