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Thread: how to cure concrete?

  1. #1
    Nisai
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    how to cure concrete?

    Hi, I was wondering what the best method is to cure concrete. I made a filter pit, and I am just doing water changes every couple days. I still have yet to measure the ph, but I assume it would go down. Does muriatic acid take out toxins? I read on epoxy sites that you should prepare concrete by etching with muriatic acid.

    Thanks

  2. #2
    Honmei ricshaw's Avatar
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    Quote Originally Posted by poisonXvenom View Post
    Hi, I was wondering what the best method is to cure concrete. I made a filter pit, and I am just doing water changes every couple days. I still have yet to measure the ph, but I assume it would go down. Does muriatic acid take out toxins? I read on epoxy sites that you should prepare concrete by etching with muriatic acid.
    Thanks

    Why haven't you measured the pH?


    Measure the pH of the "tap water" you are putting into the pond.

    Measure the pH of the water in your concrete filter pit.

    Curing the concrete with water and adding Murtiatic acid during curing (or doing an acid wash later) is to help neutralize the lime.

    Curing concrete under water increases the concrete strength and durability.
    Concrete hardens as a result of "hydration" (the chemical reaction between cement and water).
    Last edited by ricshaw; 04-21-2011 at 09:15 PM. Reason: added more

  3. #3
    Nisai
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    My tap water is around ph 7.4 and the filter pit was over the chart, I'm guessing around 7.8~8.2.

    Would anything speed up this curing process for stable ph levels? Where can I buy the muriatic acid?

  4. #4
    Honmei ricshaw's Avatar
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    Quote Originally Posted by poisonXvenom View Post
    Where can I buy the muriatic acid?
    Any place that sells supplies to concrete contractors.

    Murtiatic acid and it fumes are very dangerous. If you do not know what you are doing... get some advice from somebody that does!
    Last edited by ricshaw; 05-04-2011 at 10:41 PM. Reason: Added warning

  5. #5
    Nisai
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    Would that be the fastest fix?

  6. #6
    Honmei ricshaw's Avatar
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    Quote Originally Posted by poisonXvenom View Post
    Would that be the fastest fix?
    The fastest (and more expensive) fix is to paint (seal) the concrete.

    Adding Murtiatic acid to the filter pit water (a couple ounces at a time) until the pH stabilizes to around pH 7.4 - 7.6 after a couple of days, then rinse the filter pit and fill with fresh water.

  7. #7
    MCA
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    they sell the acid by the gallon in the DIY stores. Look either in cleaning supplies and/or in the concrete department.

    I used to use the acid to clean the screens on my Answers. Glad I changed to EAsy static K1 in the Nexii.

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