Why external plaster get deboned
Answer:- There are many reasons for deboning of plaster as below
1. Smooth surface of concrete members like column beam and slab due to which bond is not forming in concrete and plaster
* hacking or roughing of surfaces is very essential for creat bonding between concrete and plaster work*
2. Many times external surfaces with dust , oil or grease is also a reason of debonding.
3. Sometimes thickness and plumb of plaster surface is also a issue for debonding.
4. Temperature effect is also a one of cause
5. Proportions of mix is also important and equally important factor is in how much time it is consumed ( mostly mortar is to be consumed with in 1 hr but it is observed that many time it takes 3-4 hrs to get consumed )
Now precautions
1. Make proper at least 15 mm deep hacking on smooth concrete surface
2 use bonding chemicals on concrete surface as well as in plaster mortar.
3. Keep thickness restricted to 20 to 30 mm maximum.
4 use fibers in mortar to restrict shrinkage Cracks ( shrinkage crack is natural tendency of mortar and concrete )
Shrinkage cracks occurred due to drying of concrete or mortar.
5. There are few chemicals which provide bonding agents for plaster and concrete
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