EXAMPLE 2.4.5. VOLUME METHOD: ESTIMATING CONCRETE FOR A SECOND FLOOR

Construction of a small commercial building is in process. Estimate the concrete materials needed to complete concrete pouring for the second floor given the dimensions:

In staging, the terminal point of a column is 2/3 of the full height. This is for the reason that the minimum moment is located at this point so it is safest to have point of inflection here. Concrete pouring of a slab is a tedious job and it is not advisable to fill in columns and slab all at once at full lengths.

Assuming that all concrete works on the second floor will be using class A (1:2:4):

Volume determination:

• Columns. Before reaching the second floor, 2/3 of the columns' full height should have already been completed, thus 1/3 of the height is remaining and included in the computation.

       

• Beams. Length of beams would be taken as the gross less the space taken by columns.         

       

          

• Slab. The area of the slab will be excluding the space taken by the beams and columns and also the stairwell. The areas to be deducted from the gross area listed below: 

          
          
         
         
       

For beams, there are parts of the beams which were already included in the stairwell, so length of beams to be deducted are just the remaining lengths.

     
                            
         

         

       

Then you can finally determine the total volume needed for the concrete pouring:

     

With class A mixture:

   
   

   



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