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You need to login to ask any Questions from chapter Quality-Control of Concrete-Technology

Chapter:

Quality-Control

1. The machinery and equipments do not need much maintenance.

True False

True

In wet process, raw materials can be mixed easily and refore we don?t need any extra energy and due to this machinery and equipments do not need much maintenance.

Hint Answer

2. What is hydration of cement?

Chemical reaction of cement with acid Chemical reaction of cement with water Chemical reaction of cement with base Chemical reaction of cement with salt, and acid

Chemical reaction of cement with water

As water comes into contact with cement particles, hydration reactions immediately starts at surface of particles.

Hint Answer

3. In wet process, kiln is _______

Horizontal Vertical Slightly inclined with vertical Slightly inclined with horizontal

Slightly inclined with vertical

The kiln is slightly inclined with horizontal so that slurry coming from slurry tank can free fall with gravity into next process.

Hint Answer

4. ________ is not use to make Portland Cement (PC).

Calcareous Rocks Argillocalcareous Rocks Argillaceous Rocks Sand

Sand

Sand is mixed with Cement to make concrete instead of making cement. Materials which we get from se 3 rocks are useful to make healty PC.

Hint Answer

5. What is wet process?

Grinding and mixing of the raw materials in their dry state Grinding and mixing of the raw materials in their medium state Grinding and mixing of the raw materials in their wet state Grinding and mixing of the raw materials in their overheated state

Grinding and mixing of the raw materials in their wet state

Grinding and mixing of raw materials in ir wet state is called wet process and grinding and mixing of raw materials in ir dry state is called dry process.

Hint Answer

6. As hydration proceeds deposits of hydrated products on original cement grains makes diffusion of water to unhydrated nucleus ____

Easy Very difficult Very easy Average

Very difficult

It is difficult thus rate of hydration decreases with time & as result hydration may take several years.

Hint Answer

7. What is moisture content in slurry for dry process?

35-50% 12% 40-45% 100%

12%

12% is moisture content in slurry for dry process. The moisture content in slurry for wet process is 35-50%.

Hint Answer

8. What is moisture content in slurry for wet process?

35-50% 12% 40-45% 100%

35-50%

The moisture content in slurry for wet process is 35-50%. 12% is moisture content for dry process.

Hint Answer

9. Which compound may lead to a rapid stiffening of paste with a large amount of heat generation?

C₂S C₃S C₃A C₄AF

C₃A

C₃A is characteristically fast reacting with water & may lead to a rapid stiffening of paste with a large amount of heat generation (Flash-Set)-(Quick-Set).

Hint Answer

10. 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

Nexttt

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 Quality-Control consists of the following topics

Cement

The machinery and equipments do not need much maintenance.

What is hydration of cement?

In wet process, kiln is _______

________ is not use to make Portland Cement (PC).

What is wet process?

As hydration proceeds deposits of hydrated products on original cement grains makes diffusion of water to unhydrated nucleus ____

What is moisture content in slurry for dry process?

What is moisture content in slurry for wet process?

Which compound may lead to a rapid stiffening of paste with a large amount of heat generation?

Pick up correct statement from following.

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