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Cement

Course: Concrete Technology — Practice MCQs, solutions, formulas & past entrance questions.

Courses › Concrete Technology › Cement

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Chapter:

cement (Click to view content)

1. In wet process of cement manufacturing raw material is heated to about _________

650-900 °C 900-1300 °C 1300-1450 °C 900-1050 °C

1300-1450 °C

At 1300-1450 �C partial (20?30%) melting takes place, and belite reacts with calcium oxide to form alite.

Hint Answer

2. Pick up correct statement from following.

Gypsum in cement decreases the setting time The first compound of cement which reacts with water is C₂S Bulking of sand is less when its particles are fine Dry process is less economically

Gypsum in cement decreases the setting time

Any residual would have a negative effect on setting. The gypsum should be mixed under vacuum, if possible, and to exact water/powder ratio. The gypsum should be sprinkled into water.

Hint Answer

3. The slurry, in its movement down kiln, encounters a progressively higher temperature. At first, water is driven off and ___ is liberated.

SiO₂ CO₂ Gypsum CaO

CO₂

At 900�C limestone decomposes, CaCO₃.CaO + CO₂ (endormic reaction) CO₂ is swept away by current air.

Hint Answer

4. What is range of CaCO₃ in Argillocalcareous Rocks?

>75% 40-75% <45% 75%

40-75%

It is standard value for in Argillocalcareous Rocks (40-75% CaCO₃ such as clayey limestone, clayey marl).

Hint Answer

5. Which one doesn’t comes under Calcareous Rocks?

Limestone Cement rock Chalk Marine shell deposits

Cement rock

Cement Rock comes in Argillocalcareous Rocks. And Calcareous Rocks have Limestone, Marl, Chalk, Marine Shell Deposits.

Hint Answer

6. The machinery and equipment do not need much maintenance.

True False

False

In dry process, raw materials cannot be mixed easily and refore we need any extra energy and due to this machinery and equipments do need much maintenance.

Hint Answer

7. To obtain cement dry powder, lime stones and shales or ir slurry, is burnt in a rotary kiln at a temperature between ___

1100° and 1200°C 1200° and 1300°C 1300° and 1400°C 1400° and 1500°C

1400° and 1500°C

In this process calcareous material such as lime stone (calcium carbonate) and argillaceous material such as clay are ground separately to fine powder in absence of water and n are mixed toger in desired proportions.

Hint Answer

8. Which compound is liberates lower heat?

C₂S C₃S C₃A C₄AF

C₂S

C₂S hydrates & hardens slowly so results in less heat generation & developes most of ultimate strength.

Hint Answer

9. What is diameter of Clinker for making of Portland Cement?

.15-5 cm .15-5 m .3-4 cm .3-4 m

.15-5 cm

As materials pass through kiln ir temperature is rised upto 1300-1600 �C. The process of heating is named as ?burning?. The output is known as ?clinker? which is 0.15-5 cm in diameter.

Hint Answer

10. What is percentage of CLINKER in PC?

2-3% 4-6% 2-6% 3-5%

2-6%

Portland cement is made by mixing substances containing CaCO₃ with substances containing SiO₂, Al₂O₃, Fe₂O₃ and heating m to a clinker which is subsequently ground to powder and mixed with 2-6 % gypsum.

Hint Answer

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All Chapters

View all Chapter and number of question available From each chapter from Concrete-Technology

Cement

Types of Cement and Testing of Cement

Types of Cement and Testing of Cement

Aggregates and Testing of Aggregates

Aggregates and Testing of Aggregates

Water

Admixtures and Construction Chemicals

Admixtures and Construction Chemicals

Fresh Concrete

Strength of Concrete

Strength of Concrete

Elasticity, Creep and Shrinkage

Elasticity, Creep and Shrinkage

Durability of Concrete

Durability of Concrete

Testing of Concrete

Testing of Concrete

Concrete Mix Design

Concrete Mix Design

Quality Control

Quality Control

Special Concrete and Concreting Methods

Special Concrete and Concreting Methods

IS Codes Related to Cement and Concrete

IS Codes Related to Cement and Concrete

Repair Technology for Concrete Structures

Repair Technology for Concrete Structures

Concrete Technology Important Questions

Concrete Technology Important Questions

Topics

This Chapter cement consists of the following topics

Cement

In wet process of cement manufacturing raw material is heated to about _________

Pick up correct statement from following.

The slurry, in its movement down kiln, encounters a progressively higher temperature. At first, water is driven off and ___ is liberated.

What is range of CaCO₃ in Argillocalcareous Rocks?

Which one doesn’t comes under Calcareous Rocks?

The machinery and equipment do not need much maintenance.

To obtain cement dry powder, lime stones and shales or ir slurry, is burnt in a rotary kiln at a temperature between ___

Which compound is liberates lower heat?

What is diameter of Clinker for making of Portland Cement?

What is percentage of CLINKER in PC?

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