Sealing To Moving Concrete Cracks
I. TYPE OF DEFECTS
Type of defects: Non-structural and movable cracks.
II. SURFACE PREPARATION
- The cracks and adjacent substrate must be clean, sound and free of contaminated material. Remove dust, laitance, grease, curing compounds and other bond inhibiting materials from surface by mechanical means.
- “V” notch the surface of crack with mechanical router or hand chipping to maximum width of 8 mm and to minimum depth of 8 mm.
III. SEALING
- Material: Sikaflex Construction (J)
- To ensure the cleanliness of the substrate, use high pressure air compressor to clean the substrate from any dust and loose particle.
- In case there is possibility of the sealant adheres to the bottom of the joints then a backer rod with diameter min. 20 % bigger than the width of joint shall be applied.
- The application of Sika Primer 3 is recommended
- Gun Sikaflex Construction (J) into prepared crack to a minimum depth of 8 mm.
- Allow sealant to cure for at least 24 hours before the application of elastic water dispersed paint.
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