Effect of the activator dose on the compressive strength and accelerated carbonation resistance of alkali silicate-activated slag/metakaolin blended materials

摘要

The effects of activator dose on the properties of alkali-activated slag/metakaolin blends, were studied inudfresh and hardened states: heat evolution, strength and accelerated carbonation. High activator concentrationsudaffect the slag dissolution rate, reducing compressive strength when this is the sole precursor. Anudincreased activator concentration favours metakaolin reaction, promoting high strengths and reducedudpermeability. Metakaolin addition, and increased activator concentrations reduce the susceptibility toudcarbonation, associated with the refinement of the pore network under extended CO2 exposure. Theudeffect of adding an aluminosilicate precursor to an alkali-activated slag system is strongly dependentudon the activator concentration.