Effect of internal curing with super absorbent polymers on residual stress development and stress relaxation in restrained concrete ring specimens

Shen, Dejian; Shi, Huafeng; Tang, Xiaojian; Ji, Yong; Jiang, Guoqing

doi:10.1016/j.conbuildmat.2016.05.048

Cited by 89 publications

(27 citation statements)

References 50 publications

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“…Most of the latest studies focused on tackling autogenous shrinkage occurring in high-performance cement-based materials with a low water-to-binder ratio as SAPs can serve as internal reservoirs to supply extra curing water to drying areas (so called "internal curing"), particularly caused by self-desiccation [1,[7][8][9][10][11]. Other works performed include the effects of SAP additions on mechanical properties [8,[12][13][14][15], rheological properties [16][17][18], self-sealing [19][20][21][22] and self-healing [23], early-age restrained cracking [12,24], creep [25,26], thermal coefficient [27], and freeze-thaw resistance [16,28,29]. The findings were not quite different among the studies: (1) additions Polymers 2017, 9, 600 2 of 14 thermal coefficient [27], and freeze-thaw resistance [16,28,29].…”

Section: Introductionmentioning

confidence: 99%

Hygral Behavior of Superabsorbent Polymers with Various Particle Sizes and Cross-Linking Densities

Yun

Kim²,

Choi

et al. 2017

Polymers

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This study focuses on investigating the effects of particle size and cross-linking density on the hygral behavior of superabsorbent polymers (SAPs), which are increasingly used as an internal curing material for high-performance concrete. Four SAPs with different mean particle diameters and cross-linking densities were tested under controlled wetting and drying conditions to measure free absorption and desorption kinetics. Absorption capacities of SAPs under actual mixing conditions were additionally measured and verified by means of mortar flow and semi-adiabatic hydration heat measurements. In addition, the effects of SAP type and dosage (i.e., 0.2, 0.4, and 0.6% by mass of cement) on the mechanical properties of hardened mortar were assessed. The results indicated that: (1) the absorption capacity increased with decreased cross-linking density and increased particle size under both load-free and mixing conditions; and (2) the greater the cross-linking density and the lower the particle size, the shorter the desorption time. It was also confirmed that while the early-age mechanical properties were more related with the gel strength of swollen SAP, the later-age mechanical properties were more affected by the water retention capacity and spatial distribution of SAP in the matrix.

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Section: Introductionmentioning

confidence: 99%

Hygral Behavior of Superabsorbent Polymers with Various Particle Sizes and Cross-Linking Densities

Yun

Kim²,

Choi

et al. 2017

Polymers

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“…Diese Erfahrung war der Anlass, weitere Versuche durchzuführen, vor allem um zu sehen, ob sich das Kriechen unter Druckspannung durch Zusatz von SAP auch ändert. In der Literatur konnten nur Hinweise gefunden werden, die das Kriechen von jungem Beton beinhalteten . Im Folgenden wird über Versuche mit fünf Betonzusammensetzungen berichtet.…”

Section: Allgemeinesunclassified

Zum Kriechen von Beton mit Superabsorbierenden Polymeren unter Druckbeanspruchung

Reinhardt

Mielich

Müller

2019

Beton und Stahlbetonbau

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Superabsorbierende Polymere (SAP) speichern im Beton Wasser und geben es während der Hydratation des Zements ab, was eine innere Nachbehandlung darstellt, oder stellen es zur Aktivierung von nicht hydratisiertem Zement in Mikrorissen zur Verfügung, was einer Selbstheilung gleichkommt. Der zweite Effekt liegt den Untersuchungen zugrunde, da Kriechen von Beton, neben viskosen Verformungen des Zementsteins, auch durch Mikrorisse verursacht wird. In einer Versuchsreihe wurden fünf Betonzusammensetzungen einer Druckspannung unterworfen und die dabei auftretenden Verformungen gemessen. Es zeigte sich, dass geringe Mengen von SAP das Kriechen signifikant vermindern.

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“…SAP can be used as an internal curing material for low water cement ratio concrete. After absorbing water, the SAP particles become distributed uniformly in concrete, thus effectively providing the hydration water in the course of concrete hydration as well as effectively reducing the autogenous shrinkage of concrete and preventing concrete cracking [ 5 , 6 , 7 ]. SAP can also be used as an air-entraining agent, thereby improving the freeze-thaw resistance of concrete [ 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Permeability of SAP Modified Concrete

et al. 2020

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To study the permeability of superabsorbent polymer (SAP) modified concrete and the effect of internal pore characteristics on the permeability of concrete specimens, the results of the water penetration under pressure test, the mercury intrusion porosimetry (MIP) test, and scanning electron microscopy (SEM) of SAP concrete were obtained and analyzed. The research shows that the addition of an appropriate amount of SAP can effectively improve the anti-permeability performance of concrete. After adding 0.2~0.6% SAP of cement quality to concrete, the penetration height value was reduced by 35~45%, the porosity was increased by 21–95%, and the tortuosity is increased by 14–15%, and all indicators show regular changes with the increase in SAP usage. Adding SAP to concrete changes the internal connection state of concrete, thereby further improving its impermeability by reducing the capillary pressure and changing the shape of the pores. The liquid permeation resistance is increased by the “threshold effect” inside concrete; this “threshold effect” is caused by the addition of SAP.

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Effect of internal curing with super absorbent polymers on residual stress development and stress relaxation in restrained concrete ring specimens

Cited by 89 publications

References 50 publications

Hygral Behavior of Superabsorbent Polymers with Various Particle Sizes and Cross-Linking Densities

Hygral Behavior of Superabsorbent Polymers with Various Particle Sizes and Cross-Linking Densities

Zum Kriechen von Beton mit Superabsorbierenden Polymeren unter Druckbeanspruchung

Experimental Study on the Permeability of SAP Modified Concrete

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