Mitigating the autogenous shrinkage of alkali-activated slag by internal curing
Z. Li (TU Delft - Civil Engineering & Geosciences)
Mateusz Wyrzykowski (Swiss Federal Laboratories for Materials Science and Technology (Empa))
H. Dong (TU Delft - Civil Engineering & Geosciences)
S. Zhang (TU Delft - Civil Engineering & Geosciences)
Pietro Lura (Swiss Federal Laboratories for Materials Science and Technology (Empa), ETH Zürich)
G. Ye (TU Delft - Civil Engineering & Geosciences, Universiteit Gent)
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Abstract
Alkali activated slag (AAS) has shown promising potential to replace ordinary Portland cement as a binder material. Synthesized from industrial by-products, AAS can show high strength, thermal resistance and good durability. However, AAS has been reported to exhibit high autogenous shrinkage. Autogenous shrinkage is a critical issue for building materials since it can induce micro- or macro-cracking when the materials are under restrained conditions. Hence, this work aims at mitigating the autogenous shrinkage of AAS by means of internal curing. The influences of internal curing on microstructure formation and autogenous shrinkage are investigated. The results show that internal curing provided by superabsorbent polymers is a promising way to reduce the autogenous shrinkage of AAS.