Measuring absorption of superabsorbent polymers in cementitious environments

Zhao, Shengying; Jensen, Ole Mejlhede; Hasholt, Marianne Tange

doi:10.1617/s11527-020-1442-x

Cited by 24 publications

(18 citation statements)

References 31 publications

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“…Research papers aimed at the determination of SAPs absorption capacity, as accessed in [18,21,30,31], refer to the correlation between the solution applied and SAPs composition. The teabag method has been found as the most employed method for this purpose.…”

Section: Absorption Experiments Proceduresmentioning

confidence: 99%

Effect of Absorptivity of Superabsorbent Polymers on Design of Cement Mortars

2020

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The functional properties of composites modified by superabsorbent polymers (SAPs) strongly depend on the swelling capacity of applied SAPs. In this sense, three types of commercially available SAPs namely Cablock CT, Hydropam, and Creasorb SIS with different chemical composition and particle size distribution were studied in this manuscript to reveal the differences in absorptivity as can be viewed as pretests for their utilization in concrete composites. In addition, absorptivity in distilled water, tap water, and 0.1 M NaCl solution are examined for determining the SAPs response for the change of the solution pH. To overcome problems with the teabag method inaccuracy, the new method is introduced. Besides to quantitative evaluation of the SAPs absorptivity, the correlation for the absorption and desorption period as the function of SAPs residence time within the examined solution is proposed. To access the effect of selected SAPs on functional properties, optimization based on the flow table test is employed and mechanical parameters are determined after 7, 14, 28, and 90 days of curing. Obtained results refer to substantial differences between particular SAPs and contribute to the understanding of the effect of SAP on the functional properties of cement-based materials.

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Section: Absorption Experiments Proceduresmentioning

confidence: 99%

Effect of Absorptivity of Superabsorbent Polymers on Design of Cement Mortars

2020

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“…The opposite effect was reported by [ 47 , 48 , 49 ], which leads to a gap in the literature as the effect of the SAP in the workability is not entirely understood. The authors in [ 4 , 31 , 50 ] explained that the broad diversification of results would depend on the methodology used to accurately estimate the amount of water absorbed by SAP in the cementitious environment. The over or underestimated amount of additional water can affect the workability and the total w/c.…”

Section: Resultsmentioning

confidence: 99%

“…Many authors have reported the loss of compressive strength in the literature. However, as published by [ 50 ], this loss of strength could be provoked by the excess of water addition due to a misleading measure of the SAP absorption in the cementitious environment. Simple methods have been used to estimate the SAP absorption capacity and could be overestimating the water of absorption, increasing the water in the mixture, and lowering the compressive strength.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Combination of Superabsorbent Polymers for Autogenous Shrinkage Control with Steel Fibers of High-Performance Concrete under Uniaxial Tension Using DIC

et al. 2020

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This paper presents a study of the effect of a superabsorbent polymer (SAP) for autogenous shrinkage control on the uniaxial tensile behavior of steel fiber reinforced concrete (SFRC). The use of fibers and SAP potentially increases the durability of the concrete, preventing cracking by autogenous shrinkage and enhancing post-cracking behavior. Furthermore, SAP can provide further hydration for self-healing purposes and improve the ductility of the SFRC. In order to evaluate the effect of the addition of SAP in SFRC, dog-bone SFRC specimens with different dosages of superabsorbent polymers were cast and tested under uniaxial tension. The digital image correlation (DIC) technique was used to understand the effect of SAP on the steel fibers’ crack-bridging mechanisms. Surface strains and crack openings were inferred using the DIC technique. The effect of SAP and fibers on fresh and hardened concrete was individually investigated by flow tests and compressive strength tests. Autogenous shrinkage was measured in plain concrete to investigate the minimum SAP content required to mitigate autogenous shrinkage of 0.3%. The use of 0.3% SAP was also sufficient to reach multiple cracking behavior. This content of SAP completely suppressed the autogenous shrinkage with minimal side effects on compressive strength. An analytical formulation for the tensile behavior of SFRC was developed using the variable engagement model, presenting a mean correlation of R2 of 0.97 with the experimental results.

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“…3d). Meanwhile, the water absorption capacity of the ITW-layer can be expressed by its water content (Q) in the saturated state, which is represented by Q=(m1-m2)/m1 24 , where m1 is the weight of the ITW-layer in the saturated state (g) and m2 is the weight of the ITW layer after drying treatment (g). Result shows that the highest water content ratio is approximately 82 % (Supplementary Fig.…”

Section: Coupling Enhancement Effect On Interfacial Evaporation Of the Blt-iengmentioning

confidence: 99%

A spontaneously sustainable bioinspired interfacial evaporation driven power generation strategy

Sun

Zhaoxin

Han

et al. 2021

Preprint

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In nature, liquid evaporation occurs everywhere all the time. This low-grade energy absorption to drive liquid evaporation is greatly potential for sustainable spontaneously power generation. Here, a natural liquid evaporation strategy of interfacial evaporation driven nanogenerator (IENG) is developed in this work. Coupled by the phonon wind and a fluctuating Coulomb field, an induced direct current is generated. Simultaneously, inspired by the light-trapping properties of moth eye, a simple and efficient BLT-IENG including a hierarchical surface of bionic light-trapping and electrospinning perovskite conductivity with an enhanced thermally insulating and water storage capability is designed. This enhancement of the output performance is greatly attributed to the improvement of the interfacial evaporation characteristics driven by natural solar and wind energies. Hence, our BLT-IENG achieves a breakthrough in the unit area open-circuit voltage in the marine environment, which is improved by a factor of 7.6 over the currently reported average value. This work provides an unexplored strategy for multi-energies inspired natural interfacial evaporation driven power generation.

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Measuring absorption of superabsorbent polymers in cementitious environments

Cited by 24 publications

References 31 publications

Effect of Absorptivity of Superabsorbent Polymers on Design of Cement Mortars

Effect of Absorptivity of Superabsorbent Polymers on Design of Cement Mortars

Effect of the Combination of Superabsorbent Polymers for Autogenous Shrinkage Control with Steel Fibers of High-Performance Concrete under Uniaxial Tension Using DIC

A spontaneously sustainable bioinspired interfacial evaporation driven power generation strategy

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