Mud is a mixture of water and some combination of
soil,
silt, and
clay. Ancient mud deposits harden over
geological time to form sedimentary rock such as
shale or
mudstone (generally called lutites). When geological deposits of mud are formed in
estuaries the resultant layers are termed
bay muds. Mud is closely related to
slurry and
sediment.Mud, in the
construction industry, refers to a fluid material used to coat or adhere together items that dries hard such as
plaster,
stucco,
concrete or other similar substances.Mud that is mostly clay, or a mixture of clay and sand may be used for
ceramics, of which one form is the common fired
brick, or dried with the inclusion of straw reinforcing to form an unfired
adobe brick. Adobe walls are frequently finished with a
mud plaster, seen at right. Such buildings must be protected from groundwater, usually by building upon a masonry, fired brick, rock or rubble foundation, and also from wind-driven rain in damp climates, usually by deep roof overhangs. In extremely dry climates a well drained flat roof may be protected with a well-prepared and properly maintained dried mud coating, viable as the mud will expand when moistened and so become more water resistant.
A closeup of mudIn ceramics, the making of liquid mud (called slip)
is a stage in the process of refinement of the materials, since larger particles will settle from the liquid.
Mud is similar to
muck, but lacking significant quantities of
humus, and often containing higher proportions of
sand.
See alsoReferences
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