It is vital to understand the nature of cracks before attempting to rectify them. For this purpose cracks may be classified as follows:
MINOR CRACKS: Cracks of width up to 6mm may be categorized as Minor cracks. These include shrinkage cracks, shear cracks and non-moving cracks.
MAJOR CRACKS: Cracks of width above 6mm may be categorized as Major cracks. Structural settlement cracks, beam/column – BW joint cracks, Cracks caused by warping of flat roof slabs usually between Brick wall and slab, Roof slab-Parapet joint cracks and construction joint cracks. Repairing of structural settlement cracks should be done only after structural stabilization.
- Routing out the cracks with a mechanically operated groove cutter to form a neat groove and cleaning to be free of dust and loose particles.
- The opened groove shall be wetted thoroughly using a bottle sprayer.
- TEC KRACKFILLER shall be mixed as per the mix instructions for the product and then be applied to the opened groove ensuring proper filling without air bubbles. A putty knife or a spatula may be used for this purpose.
- On setting the filled material may either protrude or sag depending on the depth of the crack being filled.
- In case the filler protrudes, the projection may be rubbed down using fine finish polishing stones.
- In case the filler sags, one more layer of TEC KRACKFILLER may be applied as soon as the first layer sets.
- Curing is vital for the expansion of the filler material. The treatment should be cured R adequately for a minimum period of 3 days. Curing membrane TEC CURE WB may be applied as an alternative to water curing.
- The cracks should be chipped to form a neat ‘V’ shaped groove and cleaned to be free of dust and loose particles.
- The opened groove should then be wetted thoroughly.
- Over the still wet substrate one bond coat of TEC BOND SBR modified slurry R preparation shall be applied. The slurry shall be prepared by mixing one part of TEC BOND SBR with one part of cement.
- While the bond coat is still tacky, the grooves shall be filled with cement mortar 1:4 R admixed with TEC SWELL (@ 450gms per bag of cement), well compacted and then finished neat.
- Curing is vital for the expansion of the filler material. The treatment should be cured R adequately for a minimum period of 3 days. Curing membrane TEC CURE WB may be applied as an alternative to water curing.
- Routing Out the cracks with a mechanically operated groove cutter to form a neat groove and cleaning to be free of dust and loose particles.
- The opened groove shall be wetted thoroughly using a bottle sprayer.
- TEC® KRACK FILLER Shall be mixed as per the mix instructions for the product and then be applied to the opened groove ensuring proper filling without air bubbles. A putty knife or a spatula may be used for this purpose.
- On Setting the filled material may either protrude or sag depending on the depth of the crack being filled.
- In case the filler protrudes, the projection may be rubbed down using fine finish polishing stones.
- In case the filler sags, one more layer of TEC® KRACK FILLER may be applied as soon as the first layer sets.
- Curing is vital for the expansion of the filler material. The treatment should be cured adequately for a minimum period of 3 days.