Influence of liquid-binder ratio on the performance of alkali-activated slag mortar with superabsorbent polymer

Title

Influence of liquid-binder ratio on the performance of alkali-activated slag mortar with superabsorbent polymer

 Author

Yang, Zhengxian (Fuzhou University)
Shi, Peng (Fuzhou University; Politecnico di Torino)
Zhang, Yong (Fuzhou University)
Li, Z. (TU Delft Materials and Environment)

Date

2022

 Abstract

The influences of liquid-binder ratio and mixing sequence on the performance of superabsorbent polymer (SAP)-containing alkali-activated slag (AAS) mortar are investigated in this study. It is found that the SAP absorbs much less liquid in upper supernatant of AAS than in water. Mixing SAP with liquid first induces a larger absorption capacity of the SAP than mixing it with solid first. Increasing the liquid-binder ratio improves the flowability but reduces the strength of AAS mortar with SAP. Nonetheless, the strength of internally cured mixtures is higher than that of the reference even with an extra liquid-binder ratio of 0.09. The reason behind lies in the refinement of capillary and gel porosity by internal curing, despite the presence of large voids originated from SAP. The autogenous shrinkage of AAS paste is reduced significantly by the incorporation of SAP but the further mitigating effect of increased liquid-binder ratio is limited.


 Subject

Alkali activated slag
Compressive strength
Liquid-binder ratio
Pore structure
Superabsorbent polymer

 To reference this document use:

http://resolver.tudelft.nl/uuid:85c5fd2a-4d06-4a36-a163-af978d0f9a99

 DOI

https://doi.org/10.1016/j.jobe.2021.103934

 ISSN

2352-7102

 Source

Journal of Building Engineering, 48, 1-13

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2022 Zhengxian Yang, Peng Shi, Yong Zhang, Z. Li
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