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In recent years, alkali-activated slag (AAS) as an alternative low-carbon cementitious material has received increased attention.However, the high shrinkage and the crack tendency of AAS limit its wider industrial applications.Although considerable research has already been carried out on the plastic shrinkage of Portland cement (PC) based systems, information and understanding on the plastic shrinkage of AAS is still limited.As plastic shrinkage mainly occurs due to a high rate of water evaporation from the surface of fresh concrete,identifying the relationship between evaporation and plastic shrinkage is considered as the first step towards the understanding of its fundamental mechanism.