Technical Guide
Repairs To Joints Between Bricks & Concret
Very often we notice separation or cracks in locations where brick masonry meets concrete - say a column or slab. This happens as a result of differential or uneven expansion (or contraction) of the two dissimilar materials. These are often inevitable unless adequate precautionary measures are taken.
The following procedures should be adopted to repair such cracks:
1. Open the cracks into 'V' groove; clean and moisten the groove.
2. Apply a priming cum bonding coat of Polymer based chemicals / cement slurry in the proportion 1:1 (by wt.) with brush to grooved surface.
3. Immediately, fill the groove with polymer modified mortar, which is prepared by mixing :-
2 kgs. Polymer based chemicals
5 kgs. Cement
15 kgs. Quartz Sand
After 15-20 minutes level the surface with steel trowel.
4. After 48 hours, cure by sprinkling water for 2-3 days.
5. Further finishing process can then follow.
Note:
To repair any crack even in RCC the above method is suitable