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You need to login to ask any Questions from chapter Concrete-Mix-Design of Concrete-Technology

Chapter:

Concrete-Mix-Design

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. Workability of concrete is measured by ______

Vicat apparatus test Slump test Minimum void method Talbot Richard test

Slump test

Work ability of concrete is measured by slump cone test, compaction factor test. Slump cone is used for medium work ability. For high work abilities it is not accurate.Slump values vary from 0 mm to 300 mm.

Hint Answer

3. Which has Low porosity?

$Which has Low porosity?\r\n \r\n A\r\n$

A

A B Both are same Can’t predict

A

Option A figure has low porosity because content of water is less as compared to cement.

Hint Answer

4. ___________ is practical in field test.

Slump test Compacting factor test Flow table test Kelly Ball Test

Kelly Ball Test

It measures depth of penetration. Kelly Ball Test is practical in field test.

Hint Answer

5. Dry intervals in surface wetting leads to ______

Cracking Fogging High strength Good workability

Cracking

Dry intervals or patches can lead to crazing or cracking on slab surface.

Hint Answer

6. Workability of concrete can be improved by addition of ______

Iron Sodium Zinc Sulphur

Zinc

Inorganic retardants include oxides of lead, zinc, phosphate and magnesium salts. Most retarders also act as water reducers.

Hint Answer

7. Adding water increases ______

Workability Strength Fame Quality

Workability

Adding water increases workability because it is inversely proportional to workability.

Hint Answer

8. The hydration that provides initial mix and chemical bond of concrete’s ingredients is _____

First step Second step Third step Fourth step

First step

The hydration that provides initial mix and chemical bond of concrete?s ingredients is first step, but in order for slab to be properly prepared for its final finish or flooring.

Hint Answer

9. Workability can be resolved ______

With not using of plasticizers With use of plasticizers With the use of both plasticizers and super plasticizers With not using of both plasticizers and super plasticizers

With the use of both plasticizers and super plasticizers

Plasticizers and super plasticizers helps to improve workability to construct building.

Hint Answer

10. A compaction factor of .85 for a cement concrete sample indicates _______

Low workability Medium workability Good workability Very good workability

Low workability

Roads vibrated by hand-operated machines. At more workable end of this group, concrete may be manually compacted in roads using aggregate of rounded or irregular shape.

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 Concrete-Mix-Design consists of the following topics

Fresh Concrete

Approximate percentage range of A₂O₃ in OPC is ___

Workability of concrete is measured by ______

Which has Low porosity?

$Which has Low porosity?\r\n \r\n A\r\n$

A

;

___________ is practical in field test.

Dry intervals in surface wetting leads to ______

Workability of concrete can be improved by addition of ______

Adding water increases ______

The hydration that provides initial mix and chemical bond of concrete’s ingredients is _____

Workability can be resolved ______

A compaction factor of .85 for a cement concrete sample indicates _______

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