Grout es un relleno estructural sin contracción para la colocación bajo estructuras y maquinaria. Mortero especializado para el relleno de espacios. Mortero que no tenga contracción o que tenga expansión positiva. \n* Grout de construcción (si tiene contracción a largo plazo) \n* Grout de precisión \n* Grout para la instalación de losetas \n* Grout para suelos (relacionado a suelos epóxicos) \n* Grout epóxico. La necesidad de diferenciar el grout es que los morteros comunes de cemento portland tienen una contracción progresiva. Esta contracción vuelve a generar un hueco en el espacio que se esté llenando.

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Grout is a particularly fluid form of concrete used to fill gaps. It is used in construction to embed rebars in masonry walls, connect sections of pre-cast concrete, fill voids, and seal joints such as those between tiles. Grout is generally a mixture of water, cement, sand, often color tint, and sometimes fine gravel (if it is 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 are applied as a thick emulsion and harden over time, grout is distinguished from its close relative mortar by its viscosity; 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 on top of it.

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