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Concrete mixing ratios for cement, sand, aggregate, and water are generally mixed as 1 part cement, 3 parts sand, and 3 parts aggregate or stone with just enough water to make it workable.

No fines concrete mix ratio 6 : 1 ... 6 x 20mm crushed blue metal 1 x Portland cement No fines concrete will allow water to pass through but still have a compressive strength of around 1.4 MPa to about 14 MPa depending on the ratio chosen