SGS Quaity Control Engineer Interview Questions and Answers

The characteristic strength of concrete is influenced by the water-cement ratio.

• The water-cement ratio is the ratio of the weight of water to the weight of cement used in the concrete mix.

• A lower water-cement ratio generally results in higher characteristic strength.

• A higher water-cement ratio can lead to lower characteristic strength and reduced durability.

• The water-cement ratio affects the hydration process and the o...read more

The density of DI, MS, and HDPE pipes varies depending on their composition and manufacturing process.

• Density is a measure of mass per unit volume.

• DI (Ductile Iron) pipes have a density of approximately 7.2 g/cm³.

• MS (Mild Steel) pipes have a density of around 7.85 g/cm³.

• HDPE (High-Density Polyethylene) pipes have a density ranging from 0.93 to 0.97 g/cm³.

• The density of pipes is an important factor in determining their ...read more

Workability refers to the ease of handling and placing concrete, while durability refers to its ability to withstand environmental and service conditions.

• Workability is influenced by factors such as water content, aggregate size, and admixtures.

• Workable concrete can be easily mixed, transported, and placed without segregation or excessive bleeding.

• Durability is affected by factors like the water-cement ratio, cement co...read more

The pressure range of DI and HDPE pipes varies depending on their size and application.

• The pressure range of DI (Ductile Iron) pipes typically ranges from 150 psi to 350 psi.

• HDPE (High-Density Polyethylene) pipes have a pressure range of 100 psi to 300 psi.

• The pressure rating of pipes also depends on their diameter and wall thickness.

• For example, a 4-inch DI pipe with a wall thickness of 0.25 inches may have a pressure...read more