9/22/2023 0 Comments Uses for plaster![]() The slurry again rehydrates to form the gypsum crystal. The powder of calcium sulfate hemihydrate powder is called plaster of Paris powder, which is mixed with a sprinkle of water to form a slurry. The mortar used in such a plaster is prepared by the use of calcium sulfate hemihydrate, which is formed by heating the gypsum to 150☌.ĬaSO 4♲H 2O + heat (150☌) → CaSO 4♰.5H 2O + 1.5H 2O Gypsum plaster is also called plaster of Paris. There basically 5 types of plaster depending upon mortar used. The commonly used equipment for manual work base plastering is, The general raw materials used for plaster are sand, water, and cementing material, and sometimes additional admixtures. For which their thickness is,įor lime coat finishing – 4 mm- 7mm Materials and equipment used for plaster Normally, there is an adaptation of using the gypsum plaster, lime wall putty plaster as only finishing plaster. ![]() The plaster shouldn’t be too thick, else there might be cracks, falling, and blistering.Īccording to the reference of IS code 1661:1972, plaster with different numbers of coat and their relative thickness are mentioned below. Normally about 12 mm – 15 mm of total plaster is preferable in the inner smoothen face of the wall and about 20mm – 25 mm of plaster is preferred in the outer or exterior wall. The thickness of the plaster is generally dependent upon the number of coats, types of plaster, and the surface of the wall or ceiling to be plaster. Use of plaster in water tanks, channels are done in order to smoothen the surface, prevent leakage and growth of plants. And moreover, they also act as fire-resistant material preventing the propagation of fire.Īlso, plaster is very widely used to smoothen the rough and undulating surfaces. Plaster increases the thermal insulation so it protects from the heat transfer to some extent. Such a plaster has a very smooth finishing. But the amount of cement proportion in such plaster is relatively high along with the addition of some waterproofing admixture. The plaster is also used for preventing water seepage and transfer of moisture to the internal compartment. Thus, the durability of structural supporting members as they are protected. Normally, plaster’s main purpose to be used is to provide protection from external environmental exposure along with good finishing of work to increase aesthetic value. So, plaster with reinforcement is quite useful to renovate the building, to avoid cracks and damages of the wall due to seismic activities. Plaster alone doesn’t contribute any structural strength but helps to form a monolithic component with the wall and beam, a column with the use of galvanized reinforcement mesh. Plastering is generally preferred in rough surfaces of the structure and avoided into the steel and woods as it doesn’t form any proper bonding. The process is also known as the retrofitting of walls with galvanized wire mesh. Plaster, however, applied with reinforcement fibers or mesh can provide some structural strength as well as gives proper bonding to the entire structure. Plaster alone doesn’t play any significant role in the structural strength of the building components, however, it protects the structural component like a shear wall, beam, column, slabs, from direct exposure of sunlight, moisture and different gases and chemicals present in the atmosphere. ![]() ![]() It must be noted that to dry or too wet mortar cannot be used for plaster. The normally adopted ratio for plaster is 1:4, but different ratios like 1:6,1:3 are also adapted according to need and types of plaster. ![]()
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