The light feature points on a gypsum ceiling are first identified. The recessed point is formed by cutting out the gypsum boards. A hole of one by three feet is done the room corners. This is at intervals of five feet apart. The ceiling brandering is shaped to allow for the recess. The depth of the hole is half a foot. A gypsum hollow box is formed. It is one by three feet long. The electrical conduit is placed up into the recess point. Wiring is also done from the room control point.
Traditional plaster is applied over expanded metal lath and done in 3 coats to an overall thickness of 7/8”. The first coat is called the scratch coat, the second is the brown coat and the final coat is called the finish coat. There are only a few manufacturers of gypsum plaster in the U.S. The product consists of a powder that is similar to cement or lime and is packaged in paper sacks. The base coat material will usually contain a lightweight aggregate called perlite which is mixed with plaster sand and water. The finish coat is traditionally a finer gradation of gypsum, blended only with water. When applying traditional gypsum plaster it is important to control the environment by sealing up the room that the material is being applied in. Gypsum is very susceptible to shrinking, cracking and weakening if the temperature and humidity are not controlled. Direct sunlight and wind can cause gypsum to dry to rapidly. This will cause improper hydration which in turn creates a weak product and different suction rates, affecting the final color. It is important to keep the gypsum damp throughout the process up until the the finish coat. The finish coat is usually white and painted, however, it can be tinted using approved pigment to create integral color.
The radium in soil threshold used by EPA officials typically uses the standard of five picocuries per gram (radiation/mass), not including the amount of radium that would occur in soil naturally. It is at this level of radium and below the agency would consider a site not to be contaminated based on its cancer risk guidelines.
Decreases pH of sodic soils: The sodic soils are characterised by the high soil pH (>8.5). Gypsum lowers the high pH of sodic soils or near sodic soils to 7.5 to 7.8. These values are in the range of acceptability for growth of most crop plants. Increased calcium uptake by roots when gypsum is applied can decrease the pH of the rhizosphere.
Experience shows that the silicate material is extremely resistant to intense levels of pulverising – so that obtaining silicate granules with a specific surface area higher than 300 m2/kg can only be achieved with disproportionate time and energy resources, and thus makes its use unviable economically. Combining the crushed granules with other analogous materials to achieve a more intensive binding of the calcium hydroxide can be achieved by adding a small quantity of microsilicate – an industrial by-product in ferrosilicon production – in a proportion of between 5% and 15% of the volume of Portland cement, dependent on the initial activity-level of the chemical additives and the chemical make-up of the Portland.
Improves fruit quality and prevents some plant diseases: The quality of fruit depends on the amount of calcium. Calcium is nearly always only marginally sufficient and often deficient in developing fruits. Calcium moves very slowly, if at all, from one plant part to another and fruits at the end of the transport system get too little. Calcium must be constantly available to the roots. In very high pH soils, calcium is not available enough; therefore, gypsum helps. Gypsum is used for peanuts, which develop below ground, to keep them disease free. Gypsum helps prevent blossom-end rot of watermelon and tomatoes and bitter pit in apples. Gypsum is preferred over lime for potatoes grown in acid soils so that scab may be controlled.
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