VRN Construction Senior QA QC Engineer Interview Questions and Answers

Nominal mix is a rough estimate of proportions while design mix is a precise mix with specific proportions.

• Nominal mix uses approximate ratios while design mix uses specific ratios.

• Nominal mix is used for small construction projects while design mix is used for large projects.

• Nominal mix is less expensive while design mix is more expensive.

• Nominal mix is not suitable for high strength concrete while design mix can be u

The minimum percentage of admixture used in design mix varies depending on the type of admixture and the desired properties of the concrete.

• The percentage of admixture used in design mix can range from 0.1% to 5%.

• Admixtures are added to concrete to improve its workability, strength, durability, and other properties.

• Common types of admixtures include water reducers, air-entraining agents, accelerators, retarders, and su...read more

The unit weight of steel of dia 25mm is 3.85 kg/m.

• The unit weight of steel is calculated based on its density and cross-sectional area.

• The density of steel is approximately 7850 kg/m^3.

• The cross-sectional area of a 25mm diameter steel rod is 0.0004909 m^2.

• Multiplying the density and cross-sectional area gives the unit weight of 3.85 kg/m.