This study aims at presenting effective repair methods and the suitable removal depth of freeze-thaw damaged concrete before repairing, with preventing the re-deterioration after the repair. Prism specimens were exposed to pre-freeze-thaw test to give specimens freeze-thaw damage. The freeze-thaw damaged surfaces were removed with water-jet followed by patching several types of repair material on top of them. The repaired specimens were exposed to freeze-thaw test again, and after the cycles the level of freeze-thaw damage was quantified with measuring the relative dynamic modulus of elasticity. From the experiment, two important findings were revealed: Among the tested repair materials, HPFRCC and PCM have the most durable behaviour against re-deterioration. The deeper the removal depth of the freeze-thaw damaged surface with water-jet is, the less the re-deterioration of the repaired concrete becomes.
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