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A concrete mixture ratio of 1 part cement, 3 parts sand, and 3 parts aggregate will produce a concrete mix of approximately 3000 psi. Mixing water with the cement, sand, and stone will form a paste that will bind the materials together until the mix hardens.
Adjust the mixture you are using if you are mixing your own concrete. An example would be to use more portland cement and less sand for a home made concrete mix. Large aggregate like gravel and crushed limestone do not affect the strength of concrete as much as the cement to sand ratio.1  4 Edit step.djust the mixture you are using if you are mixing your own concrete. An example would be to use more portland cement and less sand for a home made concrete mix. Large aggregate like gravel and crushed limestone do not affect the strength of concrete as much as the cement to sand ratio. 1  4 Edit step.