Assistant Chemist Interview Questions and Answers for Freshers

Bleeding of concrete can be controlled by reducing the water content, using proper mix design, and avoiding overworking the concrete.

• Reduce water content to prevent excess bleeding

• Use proper mix design with appropriate aggregate size and type

• Avoid overworking the concrete, which can cause excess bleeding

• Use admixtures such as air-entraining agents or viscosity-modifying agents

• Use proper curing techniques to prevent surface evaporation and promote hydration

• Consider using a sur...read more

Concrete is a mixture of cement, sand, gravel, and water used for construction.

• Concrete is a strong and durable material used in construction.

• It is made by mixing cement, sand, gravel, and water in specific proportions.

• The mixture hardens over time and becomes a solid mass.

• Concrete is used for building foundations, walls, floors, and roads.

• It can also be used for decorative purposes, such as in stamped concrete or polished concrete floors.

Cement contents vary for different grades of cement.

• Cement is graded based on its compressive strength at 28 days.

• The most commonly used grades are 33, 43, and 53.

• The cement content for each grade depends on the type of cement used.

• For example, for OPC (Ordinary Portland Cement), the cement content for grade 33 is 220 kg/m3, for grade 43 it is 300 kg/m3, and for grade 53 it is 350 kg/m3.