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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. Air entrainment in concrete increases ________

Strength Workability The effect of temp variations The unit weight

Workability

There are following types of Air entrainment in concrete which helps to increase workability.

Hint Answer

2. What are plasticizers?

Which adds water for workability Which reduces water for workability Which decreases workability at the same water content Which oxidizes water for workability

Which reduces water for workability

The organic substances or combinations of organic and inorganic substances, which allow a reduction in water content for given workability, or give higher workability at same water content.

Hint Answer

3. Silica fume is usually added during ________

Before concrete production at a concrete plant After concrete production at a concrete plant Concrete production at a concrete plant Curing

Concrete production at a concrete plant

Silica fume for use in concrete is available in wet or dry forms. It is usually added during concrete production at a concrete plant.

Hint Answer

4. Chemically active pore fillers ______ setting of concrete.

Retards Decrease Accelerates No change

Accelerates

Chemically active pore fillers accelerate setting of concrete and thus render concrete more impervious at early age.

Hint Answer

5. After finishing concrete surface must be kept _______

Dry First dry it and then wet it First wet it and then dry it Wet

Wet

After finishing concrete surface must be kept wet, so that it?d be prevented from evaporation.

Hint Answer

6. Find odd one out.

Finely divided minerals Air entraining agents Synthetic derivatives Natural derivatives

Natural derivatives

Finely divided minerals, Air entraining agents, Syntic derivatives are types of plasticizers.

Hint Answer

7. Nomenclature of water proofing agent.

PC KIM PCKIM WP

KIM

Nomenclature of water proofing agent is KIM and PC is nomenclature of Portland cement.

Hint Answer

8. What is limitation of plasticizers?

A good plasticizer is one which does not cause air-entrainment in concrete > .1-.2% A good plasticizer is one which does not cause air-entrainment in concrete > 5% A good plasticizer is one which does not cause air-entrainment in concrete > 10-20% A good plasticizer is one which does not cause air-entrainment in concrete > 1-2%

A good plasticizer is one which does not cause air-entrainment in concrete > 1-2%

A good plasticizer is one which does not cause air-entrainment in concrete is greater than 1-2%.

Hint Answer

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

To accelerate the initial set of concrete, to speed up the rate of development of strength at early ages To enhance the workability To reduce the segregation in grout and concrete mixers To retard the initial set, to keep concrete workable for a shorter time for placement

To retard the initial set, to keep concrete workable for a shorter time for placement

To retard initial set, to keep concrete workable for a longer time for placement is incorrect in above statement.

Hint Answer

10. Retarders are used to _______

Offset the accelerating effect of cold weather on the setting of concrete Offset the accelerating effect of hot weather on the setting of concrete Offset the Retarding effect of cold weather on the setting of concrete Offset the Retarding effect of hot weather on the setting of concrete

Offset the accelerating effect of hot weather on the setting of concrete

Retarders are used to offset accelerating effect of hot wear on setting of concrete.

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

Air entrainment in concrete increases ________

What are plasticizers?

Silica fume is usually added during ________

Chemically active pore fillers ______ setting of concrete.

After finishing concrete surface must be kept _______

Find odd one out.

Nomenclature of water proofing agent.

What is limitation of plasticizers?

Which of following statement is incorrect about function of admixtures?

Retarders are used to _______

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