![]() Other additives include, salt, stearate, tallow, tannin, leaves and bark of certain trees, xanthan gum, alum, natural glues, gum arabic, kelp, lime, powdered milk, or the blood of livestock.Ĭooked flour paste is a cheap natural glue that is easy to make from common ingredients. Some of the most common additives are wheat flour paste, manure, cactus juice, casein (milk protein) and various natural oils such as linseed oil. Sometimes additives are added to the finish coat and other times additives may be added to all coats. The fiber used in plasters must be clean, dry, and mold-free.Īdditives are usually blended with the clay, sand, and natural fiber to improve the workability and strength of a plaster. When clay dries it shrinks and tends to crack, but this cracking can be countered by the fiber. Fiber also provides some flexibility to a dried plaster. Fiber forms a reinforcing meshwork in plasters, which helps to hold the plaster together. Because sand occurs naturally in many subsoils, all of the sand necessary may be already found in the soil.įiber: tensile strength and reinforcement ĭry straw, hemp fiber, cattails, coconut fiber, and animal hair are all suitable fiber choices for earthen plasters. Predominately composed of silicon dioxide ( quartz), sand is a non-reactive substance. Sand consists of tiny mineral granules of rock, its parent material. ![]() Sand provides structure, strength, and bulk to earthen plasters. Clay is also plastic when wet, which makes the plaster mixture workable. Clay is cohesive and binds to the sand and the straw, holding the mixture together, as well as securing the mixture to the wall. Most clays consist of hydrous aluminum silicates, though there is a considerable amount of chemical variation among the clays. Usually the term plaster refers to a wall covering made from earth, lime or gypsum, while stucco uses a cement or synthetic binding element.Ĭlay is a soil component consisting of extremely fine particles. It provides protection to the structural and insulating building components as well as texture and color.Īll plasters and stuccos have several common features: they all contain a structural component, a binding element, and some form of fiber. Earthen plaster is usually applied to masonry, cob, or straw bale or backing boards such as gypsum in interiors or exteriors as a wall and ceiling finish. Other common additives include pigments, lime, casein, prickly pear cactus juice ( Opuntia), manure, and linseed oil. ( March 2012) ( Learn how and when to remove this template message)Įarthen plaster (adobe plaster, dagga ) is a blend of clay, fine aggregate, and fiber. ![]() Please help to improve this article by introducing more precise citations. This article includes a list of general references, but it lacks sufficient corresponding inline citations.
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