Common Types of Concrete Repair Mortar, Chemicals and other Repair Material

Common Types of Concrete Repair Mortar, Chemicals and other Repair Material
In this blog, we explain different types of building repair mortar and chemicals which are commonly used for building repairing. Explain portland cement mortar, polymer-modified cement mortar, epoxy mortar, polymer chemicals, latex chemicals, polyester resins and so more.

concrete repair mortar and chemicals


Types of Concrete Repair Mortars Used for repairing of Structure:

             Many types of mortars are used to repair structures. 
  1. Portland cement mortar
  2. Polymer modified cement mortar
  3. Epoxy mortar

1.  Portland cement mortar:

Portland cement mortar is generally used only for repair of exposed surfaces and new concrete surfaces, when the defective part is too wide for dry packing and thickness is less than this type of mortar will be used for repairing purposes. This mortar is not used for repair. 
Portland cement mortar
Image By :- Pinstrest
Portland Cement Mortar, Ordinary Portland Cement (Grade-43), is a mixture of water and clean sand. The proportion of cement and sand are similar to repair surface cement, sand proportion.

2.  Polymer Modified Cement Motor (PMI): –

This type of Mortar is used only for repairing the open surface of the old concrete.  Polymer Modified Cement Mortar should be used if the repair area is large and the thickness of the repair is more than 50 mm.
polymer modified cement mortar
In addition to cement, sand, water, polymers are added to this type of motor.  The polymer is available in the following form. 
  • Polymer latexes
  • Redispersible polymer powders
  • Water-soluble polymer
  • Liquid resins


How To Make Polymer Modified Cement Mortar

  • To make polymer modified mortar,
  • First a cement, the sand motor in the ratio of 1: 3 to 1: 2 is prepared. 
  • Then add polymer, 50% to 20% of the weight of cement. 
  • As per the need for Workability, select the water-cement ration between 0.3 to 0.6.
  • Polymer Modified Cement Mortar now ready to use.
  • This mortar is spread in thin layers.

 3.  Epoxy mortar:

 Epoxy the mortoar is made from a mixture of Epoxy resin, hardener, and sand. On an old surface of concrete, first applied Epoxy Bond coat then apply Epoxy Mortar on concrete surface and repair.

Such a mortar acquires Strength in a few hours.  Such mortars have
  • high strength. 
  • The barrier against wear and tear is high. 
  • Moisture barrier,
  • can be applied in fairly thin layers.
This type of mortar can be used in such a condition.
  • Where the epoxy bonded concrete Couldn’t be used
  • The thickness of repair (like,cracks) is not more than 40mm.
  • Repair area is less than 0.1 squaremeter.

Types of Concrete Repair Chemicals Used for repairing of Structure: 

Chemicals are essentially used in the construction and maintenance of the building. Different types of concrete repair chemicals are given below.
  1. Epoxies
  2. Polymer and Lates
  3. Acrylic Polymers
  4. Polyester resins
  5. Others

1. Epoxies:

Epoxy is one type of organic chemical. In order for it to be polymerized, it is needed the two  material
  • Epoxy Resins
  • Curing Agent (Hardner). 
Epoxies chemical for concrete repair
IMAGE BY – GUFIXING

a) Epoxy Resins

Epoxy resins is a natural material which is obtained by plants and tree. It can also be made in the factory. They are organic adhesive substances that are insoluble in water.

Example:- M – Seal which is available in two parts in one packet in the market is used to seal tank leakage of Car Radiator, to seal cracks between doors and walls, to seal broken ceramic pieces, etc.

Properties of Epoxy Resins:
  • Good Mechanical Strength
  • Good Chemical Resistance
  • Ease of Working
  • High Tensile Strength
It has low viscosity. It can also be ejected into small cracks.
High viscous epoxy resins are used for surface coating as well as for filling large cracks or holes. 

b)Epoxy Hardner (Curing Agent):

Epoxy hardner combines with its epoxy resin to convert it from liquid to solid. The main Epoxy Hardner is as follows:
  • Aliphatic and aromatic amines
  • Polyamides, etc. 
epoxy hardener for concrete repair
IMAGE BY : – WOODIMPROVE

Uses of Epoxy:
  • Epoxy grout, mortar, coatings, etc. are widely used for repair. It gives Good Strength and Adhesive Property. It also gives toughness, which increases durability and resistance to cracks.
  • Epoxy coated steel bars are used in RCC works to protect steel against corrosion, IS: 13620 – 2004, giving specifications of epoxy coated steel bars.
  •  Epoxy based chemicals are also used to prevent leakage. Epoxy grout was first used in India in 1968 to seal cracks caused by earthquakes in Koyna Dam. Epoxy grout was used to prevent leakage of the tunnel at Bangalore ISRO

2. Polymer and Latex: –

Polymer is an organic compound with high molecular weight. It can be made by combining many small monomers or by removing water from small molecules and cooling it. (E.g. nylon).

Thus, polymers are long molecules made up of a combination of many monomers. The process of combining small molecules is called polymerization.

Rubber trees produce natural rubber (latex) in the presence of sunlight. If the rubber is manufactured in a factory, it is called synthetic rubber.

Polymer is available in the following forms:
  • Polymer latexes
  • Redispersible polymer powders,
  • Water soluble polymer
  • Liquid resins,
Well-known polymers used in construction are as follows:
  • Styrene Butadiene Rubber (SBR)
  • Styrene Acrylic Ester (SAE) derived from acrylic acid and resins

3. Acrylic Polymer:

Acrylic is created from acrylic acid. It is one special type of polymer.

Acrylic polymer emulsions are water-based polymers that can be produced from methyl methacrylate, butyl acrylate, 2-Ethylhexyl acrylate, acrylic acid, methyl acrylate, etc.

4. Polyester Resins:

Polyester is one type of polymer. In which monomer units are joint with Coo-group. It’s used to make the polymer resins. 


ALSO READ:-
SPECIAL TYPE OF BUILDING REPAIR MATERIAL.

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