What is the primary function of aggregate in concrete?

• Provide color to the concrete

• Enhance the moldability of concrete

• Act as a glue to hold particles together

• Increase the carbon footprint

What is the second principal ingredient of concrete?

• Sand

• Water

• Cement

• Aggregate

What is the most widely used type of cement in the text?

• Pozzolanic cement

• Composite cement

• Ordinary Portland cement

• Quicklime cement

How is ordinary Portland cement made?

• Heating limestone and clay in a kiln

• Mixing sand and water

• Crushing aggregate particles

• Freezing a cement paste

What happens when cement is mixed with water to form a paste?

• It turns into a gas

• Chemical reactions occur, known as hydration

• It solidifies instantly

• It loses its adhesive properties

What role does the cement paste play in holding concrete together?

• It acts as a coolant

• It expands and contracts

• It serves as a glue for aggregate particles

• It provides color to the concrete

Why is aggregate preferred over cement paste in concrete?

• It is more expensive

• It is less stable

• It is stronger than cement paste

• It is not readily available

What contributes to the carbon footprint of cement manufacturing?

• Energy-efficient materials

• Hydration reactions

• The release of carbon dioxide during the breakdown of limestone

• The use of alternative materials in construction

Is aggregate one of the three principal ingredients of concrete?

• Yes

• No

• It's the first principal ingredient.

Does cement play a role as a glue in holding the particles of aggregate together in concrete?

• Yes.

• No.

• It's an aggregate.