Smoothing grout between tiles with a rubber grout float.
Grout is a dense fluid that hardens used to fill gaps or as reinforcement in existing structures.[1] Grout is generally a mixture of water, cement, and sand, and is employed in pressure grouting, embedding rebar in masonry walls, connecting sections of precast concrete, filling voids, and sealing joints such as those between tiles. Common uses for grout in the household include filling in tiles of shower floors and kitchen tiles. It is often color tinted when it has to be kept 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 water-resistant seal.
Although both grout and its close relative mortar are applied as a thick suspension and harden over time, grout is distinguished[2] by its low 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.[1]
^ ab"Not mortar, not concrete—grout!". Masonry Advisory Council. 28 April 2015. Archived from the original on 2015-09-07. Retrieved 2015-09-13.
^Beall, Christine (1987). Masonry Design and Detailing for Architects, Engineers and Builders. McGraw-Hill. p. 103. ISBN 978-0-07-004223-0.
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