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Admixtures and Construction Chemicals

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

Courses › Concrete Technology › Admixtures and Construction Chemicals

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admixtures-and-construction-chemicals (Click to view content)

1. DPC _____ effective used in concretes that are in contact with water under pressure.

Does Doesn’t Doesn’t effect Depends on the temperature

Doesn’t

Many so-called damp proofers are not effective, especially when used in concretes that are in contact with water under pressure.

Hint Answer

2. Concrete placed in cold wear will take ________ time to gain strength.

No Less More Equal to hot weather

More

Concrete placed in cold wear will take longer time to gain strength, delaying form removal and subsequent construction.

Hint Answer

3. Chemically inactive pore fillers ______ workability.

Decrease Increase Don’t affect Improve

Improve

Chemically inactive pore fillers improve workability and to facilitate reduction of water for given workability and to make dense concrete which is basically impervious.

Hint Answer

4. Spherical particles in silica fume has diameter of ___

<1 μm >1 μm 1 μm .1 μm

<1 μm

Silica fume is an ultrafine material with spherical particles less than 1 ?m in diameter, average being about 0.15 ?m.

Hint Answer

5. At normal temperatures addition of sugar _________ per cent have little effect on rate of hydration.

.5-1 1-2 .05-.1 .1-.2

.05-.1

At normal temperatures addition of sugar .05-.1% have little effect on rate of hydration, but if quantity is increased to 0.2 percent, hydration can be retarded to such an extent that final set may not take place for 72 hrs.

Hint Answer

6. Which of following statement is incorrect about function of admixtures?

To increase the strength of concrete by reducing the water content and by densification of concrete To increase the durability of concrete to enhance its resistance to special conditions of exposure To increase the capillary flow of water through concrete and to increase its impermeability to liquids To control the alkali-aggregate expansion or alkali silica reaction

To increase the capillary flow of water through concrete and to increase its impermeability to liquids

To decrease capillary flow of water through concrete and to increase its impermeability to liquids is incorrect in above statement.

Hint Answer

7. What is amount used of plasticizers in cement by weight?

0 .1-.4% 1% 1-2%

.1-.4%

Plasticizers are used in amount of 0.1 percentage to 0.4 percentage by weight of cement.

Hint Answer

8. Which one is an anionic surfactants?

Polyglycol esters Hydroxylated carboxylic acids Lignosulphonates Carbohydrates

Lignosulphonates

Anionic surfactants such as lignosulphonates and ir modifications and derivatives, salts of sulphonates hydrocarbons.

Hint Answer

9. In a dry environment, concrete strength will be loosed as much as _______ % in moist environment.

30 40 50 60

50

Laboratory tests show that concrete strength will be loosed as much as 50% in dry environment as compared to moist environment.

Hint Answer

10. Mid-range water reducers result in at least _____ %.

2 4 6 8

8

Mid-range water reducers result in at least 8%. Mid-range water reducers provide more consistent setting times than standard water reducers.

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 admixtures-and-construction-chemicals consists of the following topics

Admixtures and Construction Chemicals

DPC _____ effective used in concretes that are in contact with water under pressure.

Concrete placed in cold wear will take ________ time to gain strength.

Chemically inactive pore fillers ______ workability.

Spherical particles in silica fume has diameter of ___

At normal temperatures addition of sugar _________ per cent have little effect on rate of hydration.

Which of following statement is incorrect about function of admixtures?

What is amount used of plasticizers in cement by weight?

Which one is an anionic surfactants?

In a dry environment, concrete strength will be loosed as much as _______ % in moist environment.

Mid-range water reducers result in at least _____ %.

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