Ab- and Desorption Behavior of Superabsorbent Polymer in Cement Pastes
Source abstract
Abstract
Internal curing cement-based materials utilizing superabsorbent polymer (SAP) demonstrates a significant mitigation of shrinkage effects. And the water ab- and desorption behavior of SAP provides critical insights for optimizing the mix proportion design in internal curing applications of cement-based materials. Herein, the ab- and desorption curves of SAP with different parameters in real cement pastes were quantitated through X-ray radiography. The influence laws and mechanisms of SAP size, SAP dosage and water-to-cement ratio (w/c) on the curves in cement pastes were clarified. The experimental results demonstrate that both the maximum water absorption capacity and desorption rate of SAP exhibit a positive correlation with w/c at early age, owing to more free water content and lower Na+/K+ concentrations for higher w/c. However, at later age, the desorption rate of SAP becomes inversely proportional to w/c owing to the humidity. Besides, the water retention capacity of SAP at later age shows a direct proportionality to SAP dosage. And a quite unexpected finding is the reabsorption behavior of SAP in high w/c (over 0.42) after 7 hours of cement hydration. The mechanism behind the reabsorption phenomenon is the deduction of calcium ions concentration in cement-based environments, which make SAP exhibit calcium ion leaching behavior.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Concrete Properties and Behavior · Concrete and Cement Materials Research · Innovative concrete reinforcement materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
The State Key Laboratory of Engineering Materials for Major Infrastructure, Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189, People's Republic of China.
References (52)
Show source-provided references
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