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This study reports the observation of efflorescence in fly ash-based geopolymers. The efflorescence rate stronglydepends on the activation conditions; at the same alkali content under ambient temperature curing, NaOHactivatedgeopolymers show less and slower efflorescence than sodium silicate-activated specimens.Geopolymers synthesised at high temperature exhibit much lower efflorescence than those synthesised at lowtemperature, except for the sodium silicate-activated samples. The substitution of 20% fly ash by slag reducesthe efflorescence rate. A relationship between alkali leaching from monosized fractured particles and ‘efflorescencepotential’ is proposed. Soluble silicate and slag addition are beneficial in reducing efflorescence rate, buthave very limited influence on the overall efflorescence potential, as they appear to have a delaying ratherthan mitigating effect. The partial crystallisation of geopolymers, by curing at high temperature, appears to bethe most effective method of reducing the efflorescence potential
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