Classification and Application of Repair Mortar

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New Earth Group


Classification and Application of Repair Mortar

The repair mortar mainly refers to the cement-based dry-mixed mortar modified by high molecular polymer. It mainly acts on the repair of concrete defects, the reinforcement and transformation of old buildings and bridges, etc. It is the material of choice when the thickness of concrete surface damage is less than 50mm. The repair mortar is similar to the damaged old concrete, has good matching and excellent adhesion, meets the requirements of the repair project on the compressive strength, flexural strength, wear resistance, flexibility, low shrinkage and the like of the material, has the characteristics of convenient construction, good workability, good hanging performance, easy construction of component facade and top surface, and has good appearance and excellent durability after hardening. So what are the types of repair mortar? Generally speaking, the repair mortar is divided into two categories: appearance decoration and aesthetic repair mortar. Cement-based mortar is used for internal and external decoration, while gypsum-based dry mortar is only used for certain special internal decoration (aesthetic repair), for example, to fill small holes, voids, cracks and caves to restore the original size. For structural repair mortar, from the construction sequence can be divided into bottom coating mortar, intermediate layer repair mortar and meticulous layer repair mortar three parts.
(1) Subcoat
It is mainly cement and contains a small amount of redispersible latex powder. This primer mortar is alkaline and has a protective effect on the reinforcement, while the resin contained in it ensures the adhesion to the reinforcement and the substrate.
(2) Middle layer
It plays a good role in cracking resistance and filling, and has sufficient strength to form an overall good strength support system.
(3) Surface layer
The concrete repair area is usually covered with a fine surface decoration layer, which makes the rough concrete slab smooth and free of holes. The material should have sufficient adhesion, smooth surface, good construction performance, sufficient hydrophobicity and air permeability, so that the substrate can be completely dried and protected.
Repair mortar can not only be used for industrial and civil facilities in reinforced concrete or cracked building surfaces, panels, load-bearing columns, beams and other external plaster repair, wet industrial, civil building external plaster decoration. It can also be used for repairing defects such as concrete honeycomb and holes, repairing the thin layer of damaged concrete floor and repairing the overall protective surface on the surface of concrete, masonry structure or steel structure. It also has a good effect on the repair of industrial and civil buildings that have been damaged and can not meet the design requirements.

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