Grouting for Stones and Tiles

Grout is the material that is used to fill the space between adjacent tiles and support the joints. It is visible and can be water-resistant. However, in most Portland cement based grouts, water or other liquids are likely to penetrate the joints.

There are two major classifications of grout:
.      1. Cement based (CG) grout
.      2. Epoxy based (RG) grout

 

Cement based (CG) grout

They can be further classified as class 1 (CG1) for Normal Performance and class 2 (CG2) for Improved Performance).

In cementitious grouts, there are two basic types: sanded and non-sanded.

 

The general industrial practice for the application of cementitious grouts is as follows:

Sanded groutsFormulated with Fine Silica Sand for Joint width of
up to 6 mm
Formulated with Coarse Silica Sand for Joint width
between 4 mm to 15 mm
Non-Sanded groutsJoint width of 4 mm or smaller

 

Sanded cementitious grout

Sanded cementitious grout

Sanded cementitious grout

This grout consists of very fine graded aggregates, portland cement, synthetic resins and coloured pigments added with water retentive additive.

 

Non-sanded cementitious grout

Non-sanded cementitious grout

Non-sanded cementitious grout

This cement based grout consists of fine fillers, synthetic resins, colored pigments and water-retentive additive. It is designed for use on tile surfaces that are dry when the grout is applied. The water retentive additive allows the grout to stay moist until the cement cures properly.

 

Epoxy based (RG) grout

The grout consists of epoxy resin, silica fillers, pigments and a hardener. They have very low water absorption, higher compressive strength, are resistant to staining and easy to maintain. Epoxy grout is a waterless mix formed by mixing a base material (part A) and a hardener (part B). These components are mixed on site just prior to grouting. Generally, epoxy grouts require no additional sealer to protect the surface. However, epoxy grout is costly and the method of application is slightly more difficult compared to cement based grouts. Also, when resistance to chemical attack is important, prior testing of the grout ingredients against the chemical should be considered before use.

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