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The plasticity index is the size of the range of water contents where the soil exhibits plastic properties. The PI is the difference between the liquid and plastic limits (PI = LL-PL). Soils with a high PI tend to be clay, those with a lower PI tend to be silt, and those with a PI of 0 (non-plastic) tend to have little or no silt or clay.
Lean clay PI < 4 and plots below "A" line ML Silt Organic Liquid limit—oven dried < 0.75 OL Organic clay Liquid limit—not dried OL Organic silt Silts and Clays. Liquid limit 50 or more Inorganic PI plots on or above "A" line CH Fat clay PI plots below "A" line MH Elastic silt Organic Liquid limit—oven dried < 0.75 OH Organic clay
High-quality clay is also tough, as measured by the amount of mechanical work required to roll a sample of clay flat. Its toughness reflects a high degree of internal cohesion. [12] Clay has a high content of clay minerals that give it its plasticity. Clay minerals are hydrous aluminium phyllosilicate minerals, composed of aluminium and silicon ...
Clay minerals are hydrous aluminium phyllosilicates (e.g. kaolin, Al 2 Si 2 O 5 4), sometimes with variable amounts of iron, magnesium, alkali metals, alkaline earths, and other cations found on or near some planetary surfaces. Clay minerals form in the presence of water [1] and have been important to life, and many theories of abiogenesis ...
Origanum onites, the Cretan oregano, [citation needed] Greek oregano, [2] pot marjoram [2] or Ellinikí rίgani in Greek (Ελληνική ρίγανη), is a plant species in the genus Origanum found in Sicily, Greece and Turkey. [3] It has similar flavors as common oregano.It has antimicrobial activities. [4]
Origanum syriacum. Origanum (/ oʊ ˈ r ɪ ɡ ə n ə m / oh-RIG-ə-nəm [3]) is a genus of herbaceous perennial flowering plants and subshrubs in the family Lamiaceae.They are native to Europe, North Africa, and much of temperate Asia, where they are found in open or mountainous habitats.
Expansive clay is a clay soil that is prone to large volume changes (swelling and shrinking) that are directly related to changes in water content. [1] Soils with a high content of expansive minerals can form deep cracks in drier seasons or years; such soils are called vertisols .
Origanum syriacum subsp. syriacum; syn. Majorana syriaca (also Origanum maru, although this primarily refers to a hybrid of O. syriacum), [4] bible hyssop, [5] Biblical-hyssop, [1] Lebanese oregano [1] or Syrian oregano, [1] is an aromatic perennial herb in the mint family, Lamiaceae. It is a preferred primary ingredient in the spice mixture za ...
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