As a rule of thumb, and based on my experiences for ordinary concreting works, basically, 0.80cu.m. Gravel, 0.40cu.m.Sand, 8- 40kgs bags of cement and 20 to 25 kgs of water makes up for 1cu.m. concrete.
of course, this mixture may vary according to the ff factors:
-required strength
-workability
-time of curing
-conditions of the site
-handling and placing
you may use estimate handbook for specific calculation.
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