Methods of Repairing Cracks in Concrete

It is generally determined that concrete structures face cracking hassle in the course of its lifestyles. This crack ought to be given extreme and careful attention and repair on proper time. Repairing cracked concrete involves quite a few time and value constraints.

There are several techniques of concrete crack restore. Choosing the ideal technique of concrete crack repair will let you save a whole lot of time, cash and power and might deliver long-lasting results. It is vital to understand the kind and nature of cracks that have appeared inside the construction to have the ability to pick out the most suitable and price-effective technique of restore. It is also vital to recognize the cause of cracks so that it is able to be corrected to preserve the cracks from recurring.

The following are the methods of repairing cracks in concrete:

Epoxy Injections: Epoxy injection technique of concrete crack repair can be used to bond the cracks having greater than or same to 0.05mm opening. This technique is not appropriate for crack is energetic and if the cracks are large in number, or whilst the water leakage can't be controlled.

In this approach, the cracks on uncovered concrete surfaces are sealed through injecting epoxy under the concrete crack. But, it's essential to find and connect the major motive of cracks before injecting the epoxy into the cracks otherwise the cracks will keep on emerging once more and again.

Problems which include leakages and silt contamination harm the efficiency of epoxy, therefore it is recommended to fix these problems earlier than injecting the epoxy to make it remaining longer. The Epoxy injection approach of crack repair requires quite a few discipline and skillful execution so that you need to make sure that the person executing the repairs knows his work.

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Published By
Rajib Dey
www.constructioncost.co
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Methods of Repairing Cracks in Concrete

It is generally determined that concrete structures face cracking hassle in the course of its lifestyles. This crack ought to be given extreme and careful attention and repair on proper time. Repairing cracked concrete involves quite a few time and value constraints.

There are several techniques of concrete crack restore. Choosing the ideal technique of concrete crack repair will let you save a whole lot of time, cash and power and might deliver long-lasting results. It is vital to understand the kind and nature of cracks that have appeared inside the construction to have the ability to pick out the most suitable and price-effective technique of restore. It is also vital to recognize the cause of cracks so that it is able to be corrected to preserve the cracks from recurring.

The following are the methods of repairing cracks in concrete:

Epoxy Injections: Epoxy injection technique of concrete crack repair can be used to bond the cracks having greater than or same to 0.05mm opening. This technique is not appropriate for crack is energetic and if the cracks are large in number, or whilst the water leakage can't be controlled.

In this approach, the cracks on uncovered concrete surfaces are sealed through injecting epoxy under the concrete crack. But, it's essential to find and connect the major motive of cracks before injecting the epoxy into the cracks otherwise the cracks will keep on emerging once more and again.

Problems which include leakages and silt contamination harm the efficiency of epoxy, therefore it is recommended to fix these problems earlier than injecting the epoxy to make it remaining longer. The Epoxy injection approach of crack repair requires quite a few discipline and skillful execution so that you need to make sure that the person executing the repairs knows his work.

Epoxy resin loses power while exposed to fireplace or sustained elevated temperatures and fireproofing safety is required for such structural maintenance.


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Published By
Rajib Dey
www.constructioncost.co
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Common Defects In Plastering

Several types of defects are found in plastering work which range from blistering, cracks, efflorescence, flaking, peeling, popping, softness and uneven surfaces. When these defects are visible, they should be repaired instantly.

Types of Defects in Plastering :-

1. Blistering of Plastered Surface: Blistering of the plastered surface is happened when small patches are expanded outside the plane of the plastered surface. Blistering is visible for plastered surface inside the building.

2. Cracks in Plastering: Cracks are developed on the plastered surface. Two types of cracks are found i.e. hairline cracks and wider cracks. The hairline cracks can’t be seen easily whereas the wider cracks are observed easily. The formation of fine cracks is termed as crazing.

Cracks on a plastered surface occur because of thermal movements, discontinuation of surface, structural defects in the building, defective workmanship, too much shrinkage etc.

3. Efflorescence on Plastered Surface: Efflorescence is developed on plasters when soluble salts are found in plaster making materials and building materials like bricks, sand, cement etc. Even water applied in the construction work may include soluble salts.

When a wall (newly built up) dries out, the soluble salts are provided to the surface and they become visible in the form of a whitish crystalline substance. Such a growth is defined as efflorescence and the adhesion of paint with the wall surface is severely damaged with it.

Efflorescence provides a very ugly appearance and can be eliminated slightly through dry-bushing and washing the surface frequently.

4. Flaking: The development of a very small loose mass on the plastered surface is called flaking and it is mainly occurs because of bond failure among consecutive coats of plaster.

5. Peeling: In peeling, the plaster from some section of the surface are detached and a patch is developed. Peeling is primarily occurred because of bond failure among successive coats of plaster.

6. Popping: Sometimes the plaster mix comprises of particles which get bigger on being set. A conical hole in plastered surface is created in front of the particle. This conical hole is termed as blow or pop.

7. Irregular Plaster Surface: Irregular surface defect becomes apparent because of substandard workmanship of the plastering work.

8. Softness of the Plaster: The extreme dampness at specific points on the plastered surface transforms that section soft. The softness mainly happens owing to unnecessary thinness of the finishing coats, existence of deliquescent salts, extreme suction of the undercoats etc.

9. Rust Stains on Plastered Surface: Rust stains are sometimes visible on the plastered surface specifically when plaster is provided on metal lath.

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Published By
Rajib Dey
www.constructioncost.co
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How to perform audit of old structures

There exist several types of public buildings with over 30 years lifespan. The stability of these buildings is decreased significantly owing to decay in materials.

On the basis of the yearly tests conducted on each public building, the weaker buildings having age over 30 years should be detected and the Assistant Executive Engineer level Officer of the related department should dispatch the list to the superior officer of the level.

Then, an inspection at the level of superintending Engineer/EE should be performed for all such building and an extensive structural audit should be carried out.

The related department should hand over the structural audit to an accredited Institution / agency and the details of which are provided below:

Usually, the Structural Audit should be performed with the following steps:

Step 1: The Architectural and Structural plans of the building are important. There should be detailed structural calculations along with assumptions for the structural design.

Step 2: When the Architectural plans and Structural plans do not exist, the similar should be arranged on the basis of site observations.

Step 3: A building should be examined thoroughly as follow :-

1. Any settlement in the building.
2. Cracks found in columns, beams and slabs.
3. Pictures of concrete disintegration and exposed steel reinforcements are useful.
4. Slight tapping with a hammer can disclose decay in concrete and wooden beams.

5. Erosion in reinforcement.
6. Status of Balconies – sagging, deflection, cracks.
7. Status of Architectural features.
8. Cracks in walls specifying swelling in R.C.C members or identification of erosion.
9. Leakages from terrace & Toilet blocks.
10. Leakages & dampness in walls which lead to cracks and corrosion.
11. Status of repairs & last repaired date.
12. What section of the structure was repaired?
13. Who was the Agency?
14. How much was incurred for repairs?
15. Are sanctioned Building plans available?

Step 4: Formulation of Audit Report:
Depending on the inspection on building, the Audit Report should be arranged.

Step 5: Tests Suggested:
It is vital that different types of tests are performed in the old buildings to get an idea about spreading of corrosion, distress and loss of strength in concrete & steel.

Step 6: Point out the major areas and repair them accordingly.



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Published By
Rajib Dey
www.constructioncost.co
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