Influence of assumed absorption capacity of superabsorbent polymers on the microstructure and performance of cement mortars

•The absorption and desorption of SAP was achieved by pre-soaking different additional water.•Influence of assumed absorption capacity on microstructure and performance was investigated.•The over-entrained water content and its influence was expounded in comparison with some publications. A correctl...

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Bibliographic Details
Published in:Construction & building materials 2019-04, Vol.204, p.468-478
Main Authors: Yang, Jin, Wang, Fazhou
Format: Article
Language:English
Subjects:
Building materials
Cement-based materials
Cements (Building materials)
Polymer industry
Polymers
Properties
Superabsorbent polymer
Water
Water absorption capacity
Water exchange
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Summary:•The absorption and desorption of SAP was achieved by pre-soaking different additional water.•Influence of assumed absorption capacity on microstructure and performance was investigated.•The over-entrained water content and its influence was expounded in comparison with some publications. A correctly selected absorption capacity of SAP in cement paste is quite important for the microstructure and performance of internally cured cement-based materials. In present work, various water absorption capacity values were assumed to investigate the impacts of water exchange behavior of SAP on the performance and microstructure of cement mortars. The over-entrained water content due to the rapid desorption as well as the real effective water-to-cement ratio during the mixing was quantified and was proved to be the key factor for the notably decreased mechanical strength and anti-transport property (electrical resistivity), as well as the clearly increased fluidity and capillary porosity. However, no negative influence on the self-desiccation and shrinkage mitigation was observed.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2019.01.225