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Fresh Concrete

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

Courses › Concrete Technology › Fresh Concrete

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Chapter:

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1. Approximate percentage range of A₂O₃ in OPC is ___

17-25 3-8 3- 10 4-15

3- 10

Percentage of A₂O₃ is 3-8, CaO has 60-67, SiO₂ has 17-25, SO₃ is 1-3, MgO has .1-4 and soda has .5-1.3.

Hint Answer

2. How many types of tests are re to find workability?

3 4 5 6

5

There are 5 types of test to find workability of a concrete i.e. slump test, compacting factor test, flow table test, vebe test, Kelly ball test.

Hint Answer

3. Which test Used for high workable concretes?

Slump test Compacting factor test Flow table test VeBe test

Flow table test

Compacting factor test used for high workable concretes. It measures diameter of spread after vibration.

Hint Answer

4. Workability of concrete can be improved by _______

Increasing size of aggregates Decreasing size of aggregates Increasing fine aggregates Increasing flaky aggregates

Increasing size of aggregates

Workability should be obtained by use of a well-graded aggregate which has largest maximum particle size possible.

Hint Answer

5. What is workability?

When it is easily placed and compacted heterogeneous When it is easily placed and compacted homogenous When it is not easily placed When it is easily placed but not compacted homogenous

When it is easily placed and compacted homogenous

Concrete is said to be workable when it is easily placed and compacted homogeneously i.e without bleeding or Segregation.

Hint Answer

6. Well cured concrete _____ rmal, plastic & drying shrinkage cracks.

Doesn’t affect Maximize Minimize Create

Minimize

Well cured concrete can minimize rmal, plastic & drying shrinkage cracks, making concrete more water tight, thus preventing moisture and water borne chemicals from entering into concrete.

Hint Answer

7. The water–cement ratio is ratio of ___________

Weight of water to the weight of cement Volume of water to the volume of cement Density of water to the Density of cement Weight of water to the weight of aggregates

Weight of water to the weight of cement

The water?cement ratio is ratio of weight of water to weight of cement used in a concrete mix.

Hint Answer

8. 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

9. What is percentage of air by volume in Air Entraining Cement?

3-4 10-11 7-8 9

3-4

Entertainment of air also improves work ability and durability. It is recommended that air contents should be 03-04 % by volume.

Hint Answer

10. Workability of concrete is inversely proportional to ______

Grading of the aggregates Time of transit Aggregates cement ratio Water cement ratio

Water cement ratio

Workability of concrete is inversely proportional to Water cement ratio because if amount of w/c ratio increases, workability decreases.

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 fresh-concrete consists of the following topics

Fresh Concrete

Approximate percentage range of A₂O₃ in OPC is ___

How many types of tests are re to find workability?

Which test Used for high workable concretes?

Workability of concrete can be improved by _______

What is workability?

Well cured concrete _____ rmal, plastic & drying shrinkage cracks.

The water–cement ratio is ratio of ___________

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

What is percentage of air by volume in Air Entraining Cement?

Workability of concrete is inversely proportional to ______

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