Abstract
An attempt to modify the repair interfacial transition zone by introducing fly ash into a primer between concrete substrate and repair materials was proposed. A comparison test was carried out for five different bond interfaces coated with five kinds of primers, namely neat cement paste, expansive paste, cement mortar, water-dispersible epoxy resin, and fly ash-modified mortar. The test results showed that the fly ash-modified primer made the microstructure of the repaired interface zone more dense and uniform. As a result, the splitting bond strength of the interface coated with the fly ash-modified primer was significantly higher than those coated with the other kinds of primers.
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