admixtures for plastering
Posted by kishore T.P from chennai, IN, IN on July 18, 2007
I am doing a renovation of an old building. The entire outter wall has dampness while rainy season. I hava planed to chipe off the outside plastering completly and redo the same. what method and admixture i have to adopt while redoing plastering works, so as to arrest the seepage and improve the strength of building. The building is of 15 years old and it is in chennai.
With regards
kishore .t.p
mail ID - naga_constructions@yahoo.com
Ph. 0 9841422109
A couple of points to remember:
1. Make sure you chip carefully and do not cause any damage to structure in the process. No making holes in the structure to support formwork for platforms.
2. Use a good mix design for the plaster, adequate cement, sieve the sand if it is coarse, use a mortar plasticizer or a liquid waterproofing admixture in the mortar, the most important thing is to have a control on the water to cement ratio.
3. Repair structural elements properly, where reinforcement is exposed,provide anti-corrosive coating on the reinforcement and use a bonding agent while patching the concrete.
4. While plastering make mortar in small batches. Workers generally have a tendency to make big batches and then add water when the mix gets drier. This will significantly reduce the water tighness of the structure. Quality control while plastering is the key.
5. If needed go for a double coat of plaster, do shotcrete if possible.
6. Do adequate curing after plastering.
7. Paint the finished building with a good waterproof paint.
8. Good materials, proper technique, workmanship and quality control are very important.
