Alkaline hydrogels based on diallyldimethylammonium hydroxide (DADMAOH) can fulfil 3 important functions of repair materials for cracked concrete: Sealing of the crack to prevent water leakage, re-alkalisation of carbonated cement paste, which restores the alkali buffer, and re-passivation of steel reinforcement, which prevents corrosion of the reinforcement. In a proof-of-concept experiment, for example, the sealing properties of the gel were successfully tested on a cracked test specimen, where no leakage was observed under a water pressure of 5 metres for 28 days (WTA test W2.1-E).
A. Jung, O. Weichold
A 3-in-1 alkaline gel for the crack injection in cement-based materials with simultaneous corrosion protection and re-passivation of crack-crossing steel rebars
Construction Building Mater. 2022, 344, 128092. https://doi.org/10.1016/j.conbuildmat.2022.128092
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