Classification of Cement

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What substances are present in the mixture of cement?

Iron, calcium, silica, and alumina

Water, aggregate, admixtures, and fly ash

Calcareous, siliceous, argillaceous, and other substances (correct)

Limestone, sand, clay, and gypsum

Which type of cement is manufactured from natural stones by burning and then crushing to powder?

Portland cement

Artificial cement

Composite cement

Natural cement (correct)

What is added to delay the setting action of artificial cement?

Silica

Alumina

Gypsum (correct)

Iron

What are the chief chemical components of Portland cement?

Calcium, silica, alumina, and iron Signup and view all the answers

What contributes to the strength development in the mixture of cement, sand, and aggregate?

The degree of crystallization of the calcium and gels Signup and view all the answers

Which cement constituent exhibits the greatest rate of heat liberation within the first few days?

C3A Signup and view all the answers

Why is the study and control of hydration important in mass construction (e.g., piers, dams etc.)?

To understand and manage the considerable amount of heat evolved during hydration Signup and view all the answers

What is the role of ettringite in the context of Portland cement?

It forms a barrier that reduces the rate of heat evolution during hydration Signup and view all the answers

When does the first heat peak occur during the hydration of Portland cement?

10 to 15 minutes Signup and view all the answers

What is the reason for the concrete to remain in a plastic state for several hours?

The presence of gypsum in cement stabilizes the concrete Signup and view all the answers

What is the significance of the rate of heat evolution reaching the second peak after 4 to 8 hours?

It marks the beginning of early hardening of concrete Signup and view all the answers

Classification of Cement

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Questions and Answers

What substances are present in the mixture of cement?

Which type of cement is manufactured from natural stones by burning and then crushing to powder?

What is added to delay the setting action of artificial cement?

What are the chief chemical components of Portland cement?

What contributes to the strength development in the mixture of cement, sand, and aggregate?

Which cement constituent exhibits the greatest rate of heat liberation within the first few days?

Why is the study and control of hydration important in mass construction (e.g., piers, dams etc.)?

What is the role of ettringite in the context of Portland cement?

When does the first heat peak occur during the hydration of Portland cement?

What is the reason for the concrete to remain in a plastic state for several hours?

What is the significance of the rate of heat evolution reaching the second peak after 4 to 8 hours?

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