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Grout is a particularly fluid form of concrete used to fill gaps. Grout is generally a mixture of water, cement, and sand, and is employed in pressure grouting, embedding rebar in masonry walls, connecting sections of pre-cast concrete, filling voids, and sealing joints such as those between tiles. Some common uses for grout in the household include: filling in tiles of shower floors and kitchen tiles. It is often color tinted when it will remain visible, and sometimes includes fine gravel when being used to fill large spaces such as the cores of concrete blocks). Unlike other structural pastes such as plaster or joint compound, correctly mixed and applied grout forms a waterproof seal.
Although both grout and its close relative mortar are applied as a thick emulsion and harden over time, grout is distinguished by its high viscosity and lack of lime (added to mortar for pliability); grout is thin so it flows readily into gaps, while mortar is thick enough to support not only its own weight, but also that of masonry placed above it.
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Varieties
Grout varieties include tiling grout, flooring grout, resin grout, non-shrink grout, structural grout and thixotropic grout.
Tiling grout is often used to fill the spaces between tiles or mosaics, and to secure tile to its base. Although ungrouted mosaics do exist, most have grout between the tesserae. Tiling grout is also cement-based, and comes in sanded as well as unsanded varieties. The sanded variety contains finely ground silica sand; unsanded is finer and produces a non-gritty final surface. They are often enhanced with polymers and/ or latex.
Structural grout is often used in reinforced masonry to fill voids in masonry housing reinforcing steel, securing the steel in place and bonding it to the masonry. Non-shrink grout is used beneath metal bearing plates to ensure a consistent bearing surface between the plate and its substrate.
Portland cement is the most common cementing agent in grout, but thermoset polymer matrix grouts based on thermosets such as urethanes and epoxies are also popular.
Portland cement-based grouts come in different varieties depending on the particle size of the ground clinker used to make the cement, with a standard size of around 15 microns, microfine at around 6-10 microns, and ultrafine below 5 microns. Finer particle sizes let the grout penetrate more deeply into a fissure. Because these grouts depend on the presence of sand for their basic strength, they are often somewhat gritty when finally cured and hardened.
Depending on the load it is necessary to choose a different type of grout. For example, a load of up to 7.5 tons can be expected for a garage access (2-component pavement joint mortar (traffic load)), whereas a cobbled garden path is only designed for a pedestrian load (1-component pavement joint mortar (pedestrian load)). Furthermore various substructures determine whether the type of grout should be permanently permeable to water or waterproof for example by concrete subfloors.
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Tools
Tools associated with groutwork include:
- Grout saw or grout scraper, a manual tool for removal of old and discolored grout. The blade is usually composed of tungsten carbide.
- Grout float, a trowel-like tool for smoothing the surface of a grout line, typically made of rubber or soft plastic.
- Grout sealer, a water-based or solvent-based sealant applied over dried grout that resists water, oil, and acid-based contaminants.
- Grout cleaner, an acidic or basic solution that is applied on grout lines and removes the surrounding dirt and debris.
- Die grinder, for faster removal of old grout than a standard grout saw.
- Pointing trowel, used for applying grout in flagstone, and other stone works.
Source of the article : Wikipedia
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