repair of crack

8/13/2019 repair of crack

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PROJECT :

Causes , Prevention And Repair

Of Crack In Building

Project Member : Supervisor :

JHANGIR KHAN Engr: Qaiser Jamal

MUHAMMAD RAHIM

SALMAN LATIF

MUJAHID NAZEEF


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Scheme of presentation

Introduction Purpose Classification of crack Causes of crack Prevention of crack Repair of crack Conclusion


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INTRODUCTION :

CRACK:

A crack is a complete or incomplete separation of

concrete into two or more parts, produced by breaking or

fracturing.

Purpose:

The main purpose of this project is to increase life

period of building , to improve aesthetic and architecture

appearance of building.

CLASSIFICATIONOFCRACKS:

A. Structural Cracks:

1.Due to incorrect design2.Faulty construction3.Overloading

B. Non-Structural Cracks:

1.Moisture changes2.Thermal movement


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3.Elastic deformation4.Creep5.Chemical reaction6..Foundation movement and settlement of soil7.Vegetation

CAUSES OF CRACK:

1.Chemical reaction in construction material.2. Temperature and shrinkage effects.3.Settlement of ground.4. Faulty workman ship and poor construction practice .5. Environmental stresses.

6. Bad quality material.

Prevention of Crack:

1. Drainage arrangement should be made around the

building to minimize water entry in the foundation.

2. Avoid construction of wall on filled up soil.


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3. Avoid trees grows too close to building and compound

wall.

4. Good selection of material.

5. Specification for mortar and concrete.

6. Good construction practices.

7. Due consideration to Weather effect.

Repairofcrack:

The repair for cracks may be undertaken after ascertaining

the reasons for the appearance of the crack. A few basic

principles if followed will be more effective

1. Rendering of minor crack less that 1m wide may be done

after observing the crack for some time and then sealing it

with weak mortar of cement, lime and sand.

2. Cracks where width change with season should be filled

up with elastic fillers like silicon etc.

3. Where sheer crack are observed shear keys made of RCC

concrete with at least 1.5 percent steel vein forcemeat may

be provided at 1 to 1.5m intervals.

4. If cracks are due to movement of soil in black cotton once,

prevention of moisture penetration in the surrounding areas

has to be ensured by providing a waterproof blanket around


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the plinth. The masonry wall below ground level should also

be separated from the adjoining soil by replacing the existing

soil with coarse grain material.

Conclusion :

1.The individual cracks in members are unique by

themselves.

2.They are versatile diagnostic devices, clearly indicating the

specific problem in concerned members. In addition they

also indicate the degree of seriousness of the problem.

3. The crack throw light on the discipline in the associated

structural designs and quality .

4. The corrective measures to be implemented are clearly

indicated by these cracks.

THANKS

Documents

repair of crack