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Types of Cement and Testing of Cement

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

Courses › Concrete Technology › Types of Cement and Testing of Cement

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types-of-cement-and-testing-of-cement (Click to view content)

1. Gypsum reacts with ________ to form calcium sulfo aluminates and calcium sulfo ferrite.

C₄AF CF₄ SO₃ CaO

C₄AF

C₄AF work as flux material and also it accelerates hydration of silicates. C₄AF hydrates to tricalcium aluminate hydrate and calcium ferrite CaO.Fe₂O₃ in amorphous form.

Hint Answer

2. Initial setting time of OPC should not be less than _______

15 minutes 30 minutes 28 minutes 1 hour

30 minutes

As per IS specification, minimum initial setting time is 30 minutes for ordinary portland cement.

Hint Answer

3. What is initial setting time?

The time at which cement paste loses its plasticity The time at which cement paste loses its elasticity The time at which cement paste gains its plasticity The time at which cement paste gains its elasticity

The time at which cement paste loses its plasticity

The time at which cement paste loses its plasticity is known as initial setting time of concrete.

Hint Answer

4. Which cement used in frost resistance concrete?

OPC PPC AEC QSC

AEC

It is used to fill up gap in concrete which are produced by excessive amount of water during casting (later evaporated and leave gap).

Hint Answer

5. For making cement paste, what is amount of water we need?

25% water by weight of dry cement 30% water by weight of dry cement 78% water by weight of dry cement 80% water by weight of dry cement

25% water by weight of dry cement

25% water by weight of dry cement thoroughly to get a cement paste. Total time taken to obtain thoroughly mixed water cement paste.

Hint Answer

6. Which chemical compostion has highest content in OPC?

Alumina Silica Lime Iron Oxide

Lime

Lime forms nearly two-third (2/3) of cement. Therefore sufficient quantity of lime must be in raw materials for manufacturing of cement.

Hint Answer

7. What is amount of water required to give paste normal consistency for consistency test?

.78 times .79 times .77 times .76 times

.78 times

Prepare a paste by adding 0.78 times water required to give a paste of standard consistency (i.e. 0.78P).

Hint Answer

8. Which of following option is correct?

Standard consistency (%) = (wt of water added/ wt of cement) *100 Standard consistency (%) = (wt of water added- wt of cement) *100 Standard consistency = (wt of water added/ wt of cement) *100 Standard consistency (%) = (wt cement/ wt of water) *100

Standard consistency (%) = (wt of water added/ wt of cement) *100

To determine standard consistency, we need to divide weight of water to cement and n multiply it with 100 to get percentage of standard consistency.

Hint Answer

9. Which cement is used for construction of water-retaining structure like tanks, reservoirs, retaining walls, swimming pools, dams, bridges, piers etc?

Waterproof Portland cement Colored Cement High Alumina Cement Low Heat Cement

Waterproof Portland cement

This cement is prepared by mixing with OPC or rapid hardening cement with a small percentage of some metal stearates at time of mixing.

Hint Answer

10. To measure concrete temperature, stem of rmometer must be kept by at least ___ inches of concrete.

1 2 3 4

3

The stem of rmometer should be surrounded by at least 3 inches of concrete for better reading.

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 types-of-cement-and-testing-of-cement consists of the following topics

Types of Cement and Testing of Cement

Gypsum reacts with ________ to form calcium sulfo aluminates and calcium sulfo ferrite.

Initial setting time of OPC should not be less than _______

What is initial setting time?

Which cement used in frost resistance concrete?

For making cement paste, what is amount of water we need?

Which chemical compostion has highest content in OPC?

What is amount of water required to give paste normal consistency for consistency test?

Which of following option is correct?

Which cement is used for construction of water-retaining structure like tanks, reservoirs, retaining walls, swimming pools, dams, bridges, piers etc?

To measure concrete temperature, stem of rmometer must be kept by at least ___ inches of concrete.

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