Void structure of concrete with superabsorbent polymers and its relation to frost resistance of concrete

Laustsen, Sara; Hasholt, Marianne Tange; Jensen, Ole Mejlhede

doi:10.1617/s11527-013-0188-0

Cited by 111 publications

(76 citation statements)

References 9 publications

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“…In concrete technology, 66 research on SAP has mainly focused on its use as an internal curing agent to mitigate autogenous shrinkage 67 in low w/c mixes [17,18]. Other proposed applications include rheology control, frost protection [19,20] 68 and crack sealing/healing [21][22][23][24][25][26]. A state-of-the-art report on the application of superabsorbent polymers in 69 concrete has been published by RILEM [27].…”

Section: Introduction 20mentioning

confidence: 99%

Self-sealing of cracks in concrete using superabsorbent polymers

Lee

Wong

Buenfeld

2016

Cement and Concrete Research

232

117

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5Cracks in concrete can self-heal when exposed to prolonged wetting, but this is limited to narrow cracks. In 6 practice, cracks > 0.2mm cause leakage and impair performance of structures. The potential of 7 superabsorbent polymers (SAP) to self-seal such cracks was investigated via transport experiments, 8 microscopy and modelling. Forty samples containing SAP and through-thickness cracks were subjected to 9 0.12wt.%NaCl at 4m/m pressure gradient to simulate groundwater seepage. Results show that SAP can re-10 swell and seal cracks, for example in the case of 0.3mm cracks reducing peak flow rate and total flow by 85% 11 and 98% respectively. Increasing SAP dosage accelerates sealing, but imparts a strength penalty and this 12 limits practical applications. Modelling suggests that the effectiveness of SAP can be enhanced by increasing 13 its re-swelling ratio and particle size, and depressing its initial swelling. These variables increase the SAP 14 exposed in a crack and the gel volume available to seal it. 15

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Section: Introduction 20mentioning

confidence: 99%

Self-sealing of cracks in concrete using superabsorbent polymers

Lee

Wong

Buenfeld

2016

Cement and Concrete Research

232

117

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“…Although a standardized procedure for determining the absorption of SAPs does not yet exist, there are several approaches that have been discussed in literature (Elliott, 2004;Laustsen et al, 2013). For this study, a method in which a fine filter paper was used to determine the absorption for both provided SAPs.…”

Section: Sap Absorptionmentioning

confidence: 99%

“…Investigation into the frost resistance of concretes with SAPs, as it relates to the air void structure, has been performed (Laustsen, Hasholt, & Jensen, 2013;Mönning & Lura, 2007). These studies indicate that the use of SAP has potential to reduce salt frost scaling as the voids may entrain extra air into the concrete.…”

Section: Introductionmentioning

confidence: 99%

“…These studies indicate that the use of SAP has potential to reduce salt frost scaling as the voids may entrain extra air into the concrete. This was especially noticed in concrete where the SAPs are rinsed prior to mixing (Laustsen et al, 2013). Poor freeze-thaw resistance in concrete compromises the performance, and ultimately the service life, of an otherwise healthy concrete mixture.…”

Section: Introductionmentioning

confidence: 99%

“…If the pores are only partially filled, the expansion from ice formation can be accommodated. If SAP particles can desorb (or partially desorb) the "water" held for purposes of IC, some believe that the void space created by the SAP particle can provide enough empty space to accommodate the additional volume caused by water expansion upon freezing (Dudziak & Mechtcherine, 2010;Laustsen et al, 2013;Laustsen, Jensen, & Hasholt, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Freeze Thaw Durability of Internally Cured Concrete Made Using Superabsorbent Polymers

Jones¹,

Weiss²

2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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The use of superabsorbent polymers (SAPs) to produce internally cured concrete has been shown to be effective in reducing the potential for restrained shrinkage cracking of high performance concrete mixtures. However, not much is known regarding the freeze-thaw durability of concrete mixtures that incorporate SAPs for internal curing (IC). When SAP particles desorb (or partially desorb) the "water" (pore fluid) they contain for the purposes of IC, some believe that the void space created by these particles can provide enough empty voids to accommodate the additional volume caused by water expansion upon freezing. This paper investigates the freeze-thaw durability of internally cured concrete by the use of SAPs. It has been shown that internally cured concretes made using SAP demonstrate good freeze-thaw performance when the concrete is air entrained. When the SAP was used in concrete without air entrainment it did not provide sufficient freeze-thaw durability.

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Luftporenbeton mit superabsorbierenden Polymeren (SAP) Teil 1

Schack,

Dittmar,

Schauerte

et al. 2024

Beton und Stahlbetonbau

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Superabsorbierende Polymere (SAP) besitzen die Fähigkeit, ein Vielfaches ihres eigenen Trockengewichts an wässriger Lösung aufzunehmen und zu speichern. Entsprechend wird in der Literatur vielfach der Einsatz von SAP zur inneren Nachbehandlung von Beton beschrieben. Die SAP speichern Wasser und geben es während der Hydratation langsam ab. Infolge der Wasserabgabe schwinden die Polymere und es verbleiben entsprechende Luftporen im Betongefüge zurück. So stellen SAP gleichzeitig eine Alternative zu klassischen LP‐Bildnern zur Steigerung des Frost‐ und Frost‐Tausalz‐Widerstands von Beton dar. Im Rahmen des vorliegenden Beitrags werden systematische Untersuchungen zur Herstellung von LP‐Betonen mittels superabsorbierender Polymere als Alternative zu klassischen LP‐Bildnern beschrieben und diskutiert. In Teil 1 des Beitrags wird der Einfluss der SAP auf die Frischbetoneigenschaften beschrieben. Der Fokus der experimentellen Untersuchungen lag dabei auf den resultierenden Veränderungen der rheologischen Eigenschaften sowie der Entmischungsneigung (Sedimentation der groben Gesteinskörnung und Neigung zur Wasserabsonderung) des Frischbetons bei Anwendung von superabsorbierenden Polymeren. In weiteren Teilen werden die Festbetoneigenschaften (Teil 2) sowie die Robustheit gegenüber stofflichen und umgebungsbedingten Schwankungen (Teil 3) der Betone mit SAP beschrieben und diskutiert.

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Void structure of concrete with superabsorbent polymers and its relation to frost resistance of concrete

Cited by 111 publications

References 9 publications

Self-sealing of cracks in concrete using superabsorbent polymers

Self-sealing of cracks in concrete using superabsorbent polymers

Freeze Thaw Durability of Internally Cured Concrete Made Using Superabsorbent Polymers

Luftporenbeton mit superabsorbierenden Polymeren (SAP) Teil 1

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