Question details
 
What is the reason of hairline occured in cement plastering.

dears:

can you describe for me what is the reason behined creation of small hairline after cement plastering, and how we prevent these problem.


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Question category : Cracks
On : 05/06/2008
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Answered by Priti Arora on Tue May 06, 2008 4:00 PM
 The reasons of hairline cracks in cement plastering are following.
• Shrinkage due to the use of rich mortar
• Inadequate curing
• Lack of bond with background due to joints not being racked
• Sulphate attack
• Very fine or silt mixed sand used in cement mortar
• Plastering done during hot hours
• Direct in sun rays
• Mixed background i.e. discontinuity in background is prone to cause cracking of plaster.
Prevention of hairline cracks in cement plaster
• Use of coarse and silt free sand.
• Rack the joints of brick masonry properly. If there is RCC surface, make it rough by chiseling.
• Clean dust from the surface with wire brush properly.
• Cure the surface under plaster properly at least 24 hours before starting the plaster.
• Do not plaster during hot hours.
• Do plaster on shady wall which is not in direct contact of sun rays in hot weather.
• Do proper curing after plaster and keep plaster surface wet for at least seven days.
• Make grooves in plaster between two different backgrounds if background of the surface has discontinuity.
For more details on ‘Repairs of cracks ’, click on the link given below.
How to repair Cracks
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