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To repair cracks in concrete slabs, different materials are most often used. Most often - polyurethane sealant, ready-made joint strips, hydraulic cement, polyurea-based sealant, epoxy resin-based crack filler (preferably semi-liquid). You can learn more about crack sealing materials here https://www.pomwaterproofing.ca/leak-and-crack-in-concrete/ . The main thing is that the raw materials used have adhesion to concrete and remain stable in all weather conditions.