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Repair Technology for Concrete Structures

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

Courses › Concrete Technology › Repair Technology for Concrete Structures

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1. How can we prevent cracks in concrete structures?

Due to heavy load Low w/c ratio Settlement of structure High water cement ratio

Low w/c ratio

Low w/c ratio will directly affect quality of concrete. A lower water cement ratio leads to high strength in concrete refore lesser cracks.

Hint Answer

2. Symptoms for aggressive ACR reaction?

It will show disintegration of the concrete evidenced by loss of the cement paste It will show concrete surfaces that are very rough in areas where the paste is leached Affected concrete does not exhibit telltale features too distinctly Expansion does not occur without reaction products

Affected concrete does not exhibit telltale features too distinctly

ACR affected concrete does not exhibit telltale features too distinctly. AAR results in deleterious expansive cracking of concrete occurring at later ages after construction.

Hint Answer

3. Compressive strength of hardened concrete is done by _____

Cube test Tensile splitting test Concrete core test Flexure test

Cube test

Compressive strength of hardened concrete is done by cube test. For cube test two types of specimens eir cubes of 15cm X 15cm X 15cm or 10cm X 10cm x 10cm depending upon size of aggregate are used.

Hint Answer

4. The rate of creep rapidly _______ with time.

Increase Decrease Doesn’t affect Depends on the temperature

Decrease

The rate of creep rapidly decreases with time. The time taken by a concrete structure to attained creep is 5 years.

Hint Answer

5. What is maximum w/c ratio?

.2 .3 .4 .5

.5

Water cement ratio should not exceed .5 in concreting because it will reduces workability of concrete.

Hint Answer

6. Which one can’t be reason for shrinkage of concrete?

W/c ratio Temperature Cement content Formwork

Formwork

Formwork can never cause shrinkage in concrete even it helps to reduce shrinkage in concrete.

Hint Answer

7. Symptoms for acid attack?

It will show disintegration of the concrete evidenced by loss of the cement paste It will show concrete surfaces that are very rough in areas where the paste is leached Affected concrete does not exhibit telltale features too distinctly Expansion does not occur without reaction products

It will show disintegration of the concrete evidenced by loss of the cement paste

Acid attack will show disintegration of concrete evidenced by loss of cement paste.

Hint Answer

8. A ratio of core height-to-diameter of ______ gives a standard cylinder test.

1 2 3 4

2

A ratio of core height-to-diameter of 2 gives a standard cylinder test. The ratio of core height to diameter and location where core is taken affect strength.

Hint Answer

9. At construction stage, binding wires ________

Should touch the formwork Should not touch the formwork To be turned outside To be turned whole structure

Should not touch the formwork

Binding wires to be turned inside (should not touch formwork). G.I. wires to be used in aggressive environment.

Hint Answer

10. What should be minimum water cement ratio?

.45 .5 <.45 >.45

<.45

Concrete should be workable with minimum water cement ratio (< 0.45). It should be well compacted by vibrator.

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 repair-technology-for-concrete-structures consists of the following topics

Repair Technology for Concrete Structures

How can we prevent cracks in concrete structures?

Symptoms for aggressive ACR reaction?

Compressive strength of hardened concrete is done by _____

The rate of creep rapidly _______ with time.

What is maximum w/c ratio?

Which one can’t be reason for shrinkage of concrete?

Symptoms for acid attack?

A ratio of core height-to-diameter of ______ gives a standard cylinder test.

At construction stage, binding wires ________

What should be minimum water cement ratio?

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