Gypsum influence

Waters with a high gypsum influence these are drained through Rozaes, Roces and... 

Waters with some gypsum influence these correspond to Valdedios, Espana and La... 

In addition to the four compounds discussed above, the final Portland cement may contain gypsum, alkali sulfates, magnesia, free lime and other components. These do not significantly affect the properties of the set cement, but they can influence rates of hydration, resistance to chemical attack and slurry properties. 

The evaporite source is characterized by covariation of sulfate (from gypsum) and chloride (from halite). That elements can be recycled from the ocean to land by movement of saltbearing aerosols (so-called "cyclic salts") has confused the interpretation of river flux data somewhat. While this cycling generally follows the ratio of salts in the sea, the S/Cl ratio is an exception. Taking the S/Cl ratio of the cyclic component to be 2 (based on compositional data for marine rains) and assuming that all chloride in rivers is cyclic, an upper limit for the cyclic influence can be calculated. 

Davidson, J.L. Quirk, J.P. (1961). The influence of dissolved gypsum and pasture establishment on irrigated sodic clays. Australian Journal of Agricultural Research, 12, 100-10. 

The gas permeability of the constructive materials after treatment by chemicals was examined. Influence of types of concrete, cement and gypsum, preliminary treatment by different chemicals, time between treatments by organic compounds, humidity of constructive materials, time between preparation of chemicals and treatment of materials (aging of chemicals), time between treatment of materials and testing (aging of treated materials) were investigated. 

The phenomenon of increased hardness occurs principally in minerals of sheet and chain structures, which link together through the cations (silicates and aluminosilicates, as well as hydrated sheet minerals, such as glauconite, melilite and gypsum—M ranging from 0 to about 1.25), and also in minerals of skeletal structures (borates, phosphates, sulphates, nitrates, carbonates, such as calcite, dolomite and others—Ah from 0 to about 1.15). For this reason, the hardness analysis of minerals with weak bonds demands consideration of the fact that just as the basic crystallo-chemical factors, so is hardness influenced by the form of domains (component parts of structures) in all anisodesmic minerals of chain, sheet or skeletal structure. Depending on the form of domain (and also according... 

Jia, Y. and Demopoulos, G.P. (2005) Adsorption of arsenate onto ferrihydrite from aqueous solution influence of media (sulfate vs nitrate), added gypsum, and pH alteration. Environmental Science and Technology, 39(24), 9523-27. 

Ongwandee, M. and Morrison, G.C. (2008) Influence of ammonia and carbon dioxide on the sorption of a basic organic pollutant to carpet and latex-painted gypsum board. Environmental Science and Technology, 42 (15), 5415-20. 

Different factors have an influence on the calcite solubility. First of all, like for gypsum (chapter 4.1.1.4) the formation of the CaC03° complex is endothermic (AH(CaC03°) = +3.5), while the mineral dissolution is exothermic (AH(CaC03(s)) = -2.3). Thus, the maximum solubility occurs at some medium temperature, at which the formation of the CaC03° complex is already increased and the decreasing solubility of CaC03(s) does not predominate yet. 

Mineral solubility in soil-water systems varies and depends on conditions controlling single-ion activity coefficients. Gypsum (CaS04-2H2Os), a common natural mineral, is used here as an example to demonstrate the influence of single-ion activity coefficients on mineral solubility. The solubility of CaSO F Os in water is expressed as... 

Major influences on the kinetic curve of a cement include the phase composition of the clinker, the particle size distribution of the cement and the RH and temperature regimes during curing. Other influences include the w/c ratio, the content and distribution of admixtures, including gypsum, the reactivities of individual clinker phases and probably others, such as the microstructures of the clinker and of the cement particles. 

Gharieb, M. M. Gadd, G. M. (1999). Influence of nitrogen source on the solubilization of natural gypsum. Mycological Research, 103, 473-81. 

Ceramic mixes are frequently shaped by casting aqueous suspensions called slips in gypsum moulds. The slips usually contain several solid substances, of which the clay component has the critical influence on casting behaviour. However, slips free from... 

Many factors other than packaging influence the quality and type of product emerging from the brewing process. To start with, the water quality and dissolved ion content are important, both for the chemistry of the starch conversion step and for the flavor of the finished beer. Very soft waters may require addition of small amounts of calcium chloride and/or sulfuric acid, or sometimes gypsum (CaS04-2H20) to provide sufficient trace nutrients for the yeast and a sufficiently low pH for a good product. 

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