What is Plaster? Types, Objective, Requirement good Plaster

What is plaster?

 Requirement of good plaster:- All the external and internal surfaces of masonry, particularly brick masonry work is finished smooth with the help of plaster.

Plastering is the process of covering rough walls and uneven surfaces in the construction of houses and other structures with a plastic material, called plaster. It protects the masonry work.

·         Atmospheric action

·         Penetration of rainwater into the wall

Plastering decorates the wall surfaces and does not allow dust accumulation.

What is A requirement for Good plastering

·         It should provide a smooth, non-absorbent, and washable surface.

·         It should not contract in volume while drying and setting otherwise it will crack and give an unsightly appearance.

·         They should adhere firmly to the surface and resist the effects of weather agencies such as rain, heat, etc.

·         They should offer good insulation against sound and high resistance against fire.

·         It should provide the surface with the required decorative effect and durability.

diffrent objective of plastering

·         To provide an even, smooth, regular, clean, and durable finishing surface and, sometimes, to improve appearance also.

·         To preserve ad protect the surface from atmospheric influences by acting as a protective coating.

·         Conceal the defective workmanship.

·         To cover the defective workmanship.

·         To cover up the inferior quality and porous materials and the joints formed in masonry work.

·         Provide a satisfactory base or ground for decorating the surface by applying whitewashing, color washing, painting, or distempering.

·         In the case of internal plastering, the basic objective is to protect the surfaces against dust and vermin nuisance.

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·         Types of Plaster in civil engineering

·         Lime plaster

·         Cement plaster

·         Mud plaster

·         Waterproofing plaster

Cement  sand plaster

Cement plaster is also called mortar plaster. When cement forms the building materials, the plastering is called Cement plaster.

It is an intimate mixture of Portland cement and sand with the required water to make a plastic mass.

It consists of the usual proportions of 1 Cement: 4 Sand, Through higher proportions, can be used depending upon the nature of work.

The ingredient is first thoroughly consistent, The mixing of materials done by hand on a water-tight platform, and plastering of one bag of cement is prepared at a time.

Then this prepared mortar for plastering should consume within 30 minutes after the addition of water. ( What is plaster)

Lime sand plaster

When lime forms the building material, the plaster is called Lime plaster. It more intimate mixture of equal proportions ( 1 Lime: 1 sand) and these two materials ground mechanically in a mortar mill to form a plastering or required consistency.

Sand forms the greatest proportion of plastering and also control the plastering properties, such as shrinkage, porosity, strength, adhesiveness, etc.

Fine sand generally used for making plastering but it should not that fine such as to pass more than 5% through a 100-mesh siever or more than 20% through a 50-mesh sieve. Sand to be used for plasterwork should be clean and fit for drinking purposes.

Plastering work fat lime or poor lime recommended because the hydraulic lime slakes lowly and results in damaging of plastered surfaces by blistering at a later stage.

Sometimes, to improve the strength properties of lime mortar, a suitable quantity of cement added, and this plastering mainly used for external work.

In order of improving the binding properties of lime plastering. Gugal about 1.60 kg/m³ of mortar being ground. In order to improve adhesive and tensile properties of lime mortar, sometimes, small quantities of chopped hemp added to the lime-mortar.

The quantity of hemp is usually about 1 kg/m³ of mortar. The lime mortar thus prepared usually kept for 2 days before use.

Mud Plaster

The mud plaster prepared to form an equal volume of well-tempered clay or brick earth, and of chopped straw, hay loose soil or hemp, and cow dung. All these ingredients thoroughly mixed and left for about 7 days with a large quantity of water.

This mixed again thoroughly till it comes to the desired consistency of mortar. Mud plastering makes of clay and sand is also sometimes used.

 

Water-proof plaster

This mortar consists of 1 part of cement, 2 parts of sand, and the pulverized alum at the rate of 12 kg/m³ of sand. To this dry mix, the soap water containing about 75 gm of soft soap/liter of water added to the obtained water-poofing mortar. (what is Plaster)Types of Sand, color, classification of SandGrade Of Cement, Types, and Difference between 33, 43, 53 GradeFly ash concrete uses of fly ash and AdvantagesChain Surveying: Principle, Procedure, offset, Instrument, errors

 

 

 

 

 

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