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How to adjust mix proportions if we have to work with wet sand?

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Asked: September 29, 20202020-09-29T17:12:17-07:00 2020-09-29T17:12:17-07:00In: Concrete
Kuldeep Singh
Kuldeep Singh

Kuldeep Singh

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Kuldeep Singh Learner

If we have wet sand and we don’t know the exact weight of dry sand, How do we adjust the w/c ratio and mix proportions?

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  1. Komal Bhandakkar

    Komal Bhandakkar

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    Komal Bhandakkar AUTHOR
    2020-10-03T11:27:20-07:00Added an answer on October 3, 2020 at 11:27 am
    How to adjust mix proportions if we have to work with wet sand?

    Well, this is the basic thing we need to understand while designing a mix.

    As we know that, the volume of a 1-metre cube of wet concrete is equivalent to a 1.52-metre cube of dry concrete.

    I will tell you one simple calculation with the help of an example, have a look;

    Example:

    Weight of wet sample= 1050gm

    Weight of dry sample=1000gm

    Total moisture content in percent=5%

    Absorption as found on sand data sheet= 0.5%

    Free moisture= Total Moisture – Absorbed Moisture.

    i.e. Free Moisture = 5%-0.5%=4.5%

     

     

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  2. aviratdhodare

    aviratdhodare

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    aviratdhodare
    2020-10-03T11:27:33-07:00Added an answer on October 3, 2020 at 11:27 am

    Water content in sand is determined seprately first and the requirements of water in concrete is accordingly adjusted to control w/c ratio required in the mix.

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  3. AdityaBhandakkar

    AdityaBhandakkar

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    AdityaBhandakkar User
    2020-10-03T11:27:43-07:00Added an answer on October 3, 2020 at 11:27 am

    Hi,

    The maximum amount of water to cement ratio should be determined by the authority having jurisdiction based on the exposure conditions. The targeted water to cement ratio should be selected from the data available on the materials which actually used.

    but if such data is not available then water to cement the should be selected from IS mix proportion table or ACI Table 6.9.4-a.

     

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  4. nikeetasharma

    nikeetasharma

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    nikeetasharma Guru
    2020-11-25T11:37:30-08:00Added an answer on November 25, 2020 at 11:37 am

    If you are working with wet or moisture sand and without any tech then ;
    1. Just weigh a sample of aggregate from inside your stockpile in a metal or other heat resistance receptacle.This must be a tare weight.

    2. Place this sample in an oven or any heating material to remove moisture.

    3. Again weight the sample of aggregate.

    4. Subtract weight of 3 from 1 .

    5. When using aggregate from this stockpile for your concrete mix reduce water addition by weight determined in point 4 for each unit weight determined at 1 that you add.

    After this you will get to see water releasing from your aggregate. Also understand that the moisture content is most important on your sand less so in your course aggregate.

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  5. Omprakash Dhawale

    Omprakash Dhawale

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    Omprakash Dhawale Beginner
    2020-10-05T19:34:14-07:00Added an answer on October 5, 2020 at 7:34 pm
    This answer was edited.

    Sir,

    If we are dealing with moist sand and we used it in our concrete mix then we just have to find out their free moisture content and fix it in mix proportion accordingly.

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