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  2. Hardpan - Wikipedia

    en.wikipedia.org/wiki/Hardpan

    This combination can help loosen clay particles bound into a hardpan by the actions of hard salts such as iron, calcium carbonate and sodium, by promoting their mobility through a higher pH while proving a suitable source of exchanging minerals (the gypsum). This works because gypsum salts, although not "soft", are still water permeable and ...

  3. Gypsum - Wikipedia

    en.wikipedia.org/wiki/Gypsum

    Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. [4] It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster , drywall and blackboard or sidewalk chalk .

  4. Caliche - Wikipedia

    en.wikipedia.org/wiki/Caliche

    Caliche fossil forest on San Miguel Island, California. Caliche (/ k ə ˈ l iː tʃ iː /) (unrelated to the street-slang "Caliche" spoken in El Salvador) is a soil accumulation of soluble calcium carbonate at depth, where it precipitates and binds other materials—such as gravel, sand, clay, and silt.

  5. Glossary of sculpting - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_sculpting

    Hydrocal is a US Gypsum product composed mainly of plaster of Paris and a small amount of Portland cement. Hydrocal, like its similar formulas Hydrostone, Ultracal, Duracal and others are all used for casting sculptures and other art objects as well as molds.

  6. Mortar (masonry) - Wikipedia

    en.wikipedia.org/wiki/Mortar_(masonry)

    In early Egyptian pyramids, which were constructed during the Old Kingdom (~2600–2500 BCE), the limestone blocks were bound by a mortar of mud and clay, or clay and sand. [7] In later Egyptian pyramids, the mortar was made of gypsum, or lime. [8] Gypsum mortar was essentially a mixture of plaster and sand and was quite soft.

  7. Phosphogypsum - Wikipedia

    en.wikipedia.org/wiki/Phosphogypsum

    It is mainly composed of gypsum (CaSO 4 ·2H 2 O). Although gypsum is a widely used material in the construction industry , phosphogypsum is usually not used, but is stored indefinitely because of its weak radioactivity caused by the presence of naturally occurring uranium (U) and thorium (Th), and their daughter isotopes radium (Ra), radon (Rn ...

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