What does the concrete mix ratio 1:2:4 denote in standard practice?

• A. Lean
• B. Medium
• C. Standard
• D. Rich

Answer: (C)

A 1:2:4 mix denotes the volumes of cement, sand, and coarse aggregate in a batch: one part cement, two parts sand, four parts aggregate. In standard practice, this is the conventional normal-strength mix used for general-purpose concrete. The cement binds the mixture, the sand fills gaps and improves workability, and the coarse aggregate provides bulk and strength. This ratio sits between lean mixes (which use less cement and produce lower strength) and rich mixes (which use more cement for higher strength). So it’s classified as standard, not lean or rich.