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20Binders formed through alkali-activation of slags and fly ashes, including 'fly ash 21 geopolymers', provide appealing properties as binders for low-emissions concrete production. 22However, the changes in pH and pore solution chemistry induced during accelerated 23 carbonation testing provide unrealistically low predictions of in-service carbonation resistance. 24The aluminosilicate gel remaining in an alkali-activated slag system after accelerated