EXAMPLE 2.4.4. VOLUME METHOD: ESTIMATING CONCRETE FOR A ONE-STOREY STRUCTURE

Estimate the concrete materials needed to construct a small residential structure with 8-1.0m x 1.0m x 0.30m footing embedded 1.20m from the ground. Roof beam dimensions are 0.25m x 0.35m. Height of column (from ground to top of roof beam) is 3.0m. Available cement is only 40-kg bag.

Before calculating volumes, determine which grades each member is. Let's assume that the footings, columns, and beams use class A and the slab uses class B.

Volume determination:

1. Footing: 

                    

2. Column:

         The height of columns will be the summation of the embedded and the exposed. 
               
                

                      

                     

3. Roof beam:

                  The length of the roof beams is computed by taking the dimensions on plan less the size of the columns. Take note on how the dimensions are placed on the plan. For this case, dimensions were placed on centers.

              

                    

                    

                    

                    

4. Total Volume (Class A)

                    


Estimate materials for class A concrete:

• Cement:

                     

• Sand:

                   

• Gravel:

             
                  

                 

                 


For slab: (class B)

      Since dimensions were measured from center to center, the volume for slab will be the gross area less the space taken by the columns (parts of columns) and the walls. However, details about the walls are not given so disregard for the moment.

            

           

           

Estimate materials for class B concrete:

        

           

                   

           


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