![]() ![]() Types of Gypsum Plaster.įollowing types are commonly used. Read More: Properties of Wood and Timber used in Construction. When it is mixed with water, it forms a paste which begins to set and harden quickly. Calcination of Gypsum Plasters is done very carefully, because of over-burning and under-burning. The resulting product is an Anhydrite, Commonly called Plaster of Paris. This rock is burnt at suitable temperature of ( 110 centigrade ).Īt this temperature, most of the water of crystallization is driven off. They are made from natural gypsum rock which is a hydrated sulfate of Calcium. They undergo very little expansion and contraction.They provide comparatively better insulation against heat and sound.The Gypsum Plaster are commonly used for making Architectural fancies and Decorative Designs on wall and roofs. These are that type of plasters in which gypsum is used as a Binding Material instead of Cement or Lime. It is important that the surface of plasters should be kept wet at least for 3 days after its application. However, the ratio of sand can be increased to as much as 8 like ( 1:8 ) depending upon the nature of construction.Ĭement Plasters are generally applied only in a single coat. The most common proportion for Cement Plasters is ( 1:3 ). They have been found suitable for all type of plastering work such as Protective and Decorative Finishes. These are the homogeneous lean mixture of Portland Cement and sand with water. In protective covering, the Plaster saves the Bricks or Stones from Direct Destructive Attacks of Atmosphere such as Wind, Rain and Harmful Industrial Gases.Īs a decorative finish, Plasters are used to give many appealing shades and finish designs to the construction. ![]() They are specially prepared for two reasons. They are lean mixes of Binding Materials ( Lime or Cement ) with fillers material such as Sand or Crushed stones.Īnd the process of covering surfaces with Plaster is called Plastering. Plaster may be defined as Lean Mortar used mostly for covering masonry surfaces. ![]()
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