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The absolute volume method is used to work out the material quantities for forming the necessary quantity of concrete on the basis of specified mix proportions. This method is formulated following the principle that the volume of fully compacted concrete is equivalent to the absolute volume of all the materials of concrete consisting of cement, sand, coarse aggregates and water.
Depending on the type of structure, a concrete structure may contain beams, slabs, columns and foundations etc. The volume of concrete essential for concrete structure is computed by summation of the volumes of every structural member or each parts of the members. The formula for computing the volume of a rectangular cross sectional member is length x width x height (or depth or thickness). Appropriate formula should be applied for various cross-sectional shapes of members.