How To Select Repair Materials For Concrete Structures

The process of deciding on the best materials for repairing a building is time-consuming and challenging. Getting to know the project’s leaders, including the owner, engineer, and architect, is essential. Repair materials are selected based on the requirements and trade-offs between price, quality, and risk.

A number of variables influences repair material selection, so let’s have a look at a few of them.


1.   Low Shrinkage Properties

The strength of a cementitious material diminishes over time as it shrinks. The material is subjected to strain and stress, resulting in shrinkage fractures.

Concrete and steel reinforcement may be damaged by air and water entering the concrete via shrinkage and other methods.

Because of this, surface repair epoxy with a lower shrinkage rate should be used. Incorporating non-shrinking chemicals into the cement may provide the desired qualities.

2.   Good Hardening Setting Properties

Quick setting and hardening of repair material are necessary to get the material back on the road, building, or other structure as rapidly as possible. Gradual setting materials are preferable even when additional time is needed. The repair materials must have high workability to be successful and long-lasting. For building maintenance, it is vital to use repair materials that are simple to apply if the repair material has low workability.


How To Select Repair Materials For Concrete Structures


3.   Good Bond Strength

The repair material must have good bond strength, which must be connected. It is possible to increase the strength in the following ways:

  • Use of adhesives
  • Surface interlocking system
  • Mechanics, such as mechanical bonding.

4.   Thermal Expansion Coefficients That Are Compatible

The repair material’s temperature expansion constant should match the base material’s temperature expansion continued. If the thermal expansion constants of the two materials vary, the bond line will be broken, or the weaker material will develop fractures.

Defects may occur in repair work if the coefficient of thermal expansion is not equal, affecting the job’s endurance. Therefore thermal expansion coefficient also influences the choice of repair material.

5.   Compatibility With Substrate’s Mechanical Characteristics And Strength

The repair material’s mechanical qualities should match those of the original material. Repair material should have a slightly higher Yield Strength than the base material.

As long as the base is M20-grade, you can’t use anything lower than that or higher than a combination of M25 to fix it.

6.   Low Air And Water Permeability

Water, chemicals, CO2, oxygen, and other industrial gases may easily infiltrate repair material with high permeability. As a result, a low permeability repair material is required.

The steel reinforcement’s concrete should have a pH value of more than 11.5 to prevent corrosion. The repair material should not lower the foundation material’s alkalinity.


How To Select Repair Materials For Concrete Structures


7.   Alkaline Considerations

Alkaline considerations are significant for all types of repair operations as well as for the selection of repair materials, both.

8.   Durability

In addition to being resistant to sulfate and acid assault, UV and infrared rays, heat, and other environmental aggressors, the repair material must also be long-lasting and non-degradable.

9.   No Curing Needed

The repair material should need no curing to get the job done well, and the repair material must be solid and stiff.

10.                Should Enable Relative Movement, If Expected

The repair material should be elastic for sealing fractures at expansion joints and where movement is needed. This is because movement is necessary for these areas. It must be able to accommodate relative movement without cracking or becoming distressed.


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