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Conclusions

Potential applications of shrinkage-reducing admixtures beyond their conventional usage to reduce or slow drying shrinkage have been presented. In the case of autogenous deformation of specimens cured under sealed conditions, at a fixed amount (volume) of self-desiccation, the SRAs reduce the internal capillary stresses and thus the accompanying internal RH reduction and autogenous shrinkage. In the case of reducing evaporative water loss, application of a curing solution that contains an SRA modifies the shape of the drying profile created within the porous mortar or concrete, which leads to a concurrent reduction in evaporation rates and an increase in achieved degree of hydration. While the evaporative water loss is by no means eliminated, the application of a SRA solution as opposed to only water can provide extra insurance that the concrete will remain more saturated internally and that the cement will hydrate to a greater extent.


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