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Making concrete

  1. Oct 29, 2008 #1
    1. The problem statement, all variables and given/known data
    hello I have to make a concrete base in metres cubed total 1.68 metres cubed.
    The ratio to concrete is 1 part cement to 2 parts sand and 3 parts gravel.
    how much cement,gravel, and sand in kilograms?


    2. Relevant equations

    ???

    3. The attempt at a solution
    ???
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 29, 2008 #2
    You need to find rough numbers for the density of sand, cement and gravel to do this problem.
     
  4. Oct 29, 2008 #3
    is it 1/6 times 1.68 metres for cement and how to convert it to kilograms.
     
  5. Oct 29, 2008 #4
    Not necessarily. One part (molecule) of cement could take up twice the volume as 1 part (molecule) of sand. You need to know the molecular weight (kg / mol) by knowing the chemical composition as well as the density (in kg/m^3).
     
    Last edited: Oct 29, 2008
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