Use of superabsorbent polymers (SAP) as concrete additive

Mechtcherine, Viktor

doi:10.21809/rilemtechlett.2016.18

Cited by 74 publications

(63 citation statements)

References 14 publications

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“…P(MAANa‐co‐EGDMA)@CaO‐SiO 2 was incorporated into the aforementioned paste as additive in two concentrations, 0.5% and 2.0% bwoc. In literature SAPs are incorporated in cementitious materials in dosages ranging from 0.3 to 1 and in some case 3% bwoc . In this work, one SAP dosage close to the lowest range (0.5% bwoc) and one close to the highest range (2.0% bwoc) were chosen to be examined in order to evaluate their self‐healing/sealing behavior in cementitious matrices.…”

Section: Methodsmentioning

confidence: 99%

“…One of the key parameters in self‐healing/sealing of cementitious structures is controlling the entrained water therein . To achieve this goal, the incorporation of superabsorbent polymers, SAPs, as admixtures in cement, has gained great scientific attention, as SAPs play a significant role in increasing the water availability and promoting the hydration reaction during the entire service life of the cementitious structure starting from the mixing procedure of the cement paste …”

Section: Introductionmentioning

confidence: 99%

“…1 One of the key parameters in self-healing/sealing of cementitious structures is controlling the entrained water therein. 9 To achieve this goal, the incorporation of superabsorbent polymers, SAPs, as admixtures in cement, has gained great scientific attention, as SAPs play a significant role in increasing the water availability and promoting the hydration reaction during the entire service life of the cementitious structure starting from the mixing procedure of the cement paste. 6,7,9,10 In general, SAPs are partially crosslinked, threedimensional (3D) polymer networks which can retain water from aqueous solutions in huge amounts (up to thousands of times their own dry weight) due to the presence of hydrophilic groups in their structure.…”

Section: Introductionmentioning

confidence: 99%

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Effect of submicron admixtures on mechanical and self‐healing properties of cement‐based composites

Kanellopoulou

Karaxi

Karatza

et al. 2019

Fatigue Fract Eng Mat Struct

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This study presents the development of novel submicron super absorbent polymers (SAPs) used as admixtures in cement‐based matrices with significant advantages over conventional products. The produced SAPs were characterized in respect of their morphology and composition, while their water absorption capacity was determined in different electrolyte solutions. The hybrid core‐shell spherical structure of the fabricated materials offered significant compatibility enhancement with cement while the workability of the mixture was maintained. The assessment of the cement‐based composites including SAPs revealed that their flexural strength increased by 78%. Self‐healing/sealing behavior was assessed by monitoring the crack sealing via SEM, elemental analysis of the healing products, and determination of the water absorbance coefficient for different times of treatment. The cement/SAPs composites with a concentration of SAPs 2% by weight of cement exhibited self‐healing/sealing responsive capability when an artificial crack was induced. According to the SEM characterization, the crack demonstrated complete healing for the better part of its length after 28 days of treatment.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of submicron admixtures on mechanical and self‐healing properties of cement‐based composites

Kanellopoulou

Karaxi

Karatza

et al. 2019

Fatigue Fract Eng Mat Struct

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“…When superabsorbent polymers (SAP) are mixed in concrete they absorb water in the fresh state and release it during hydration (Mechtcherine & Reinhardt 2012). One can assume that the presence of this water will influence the water migration and also the microcracking of concrete.…”

Section: Shrinkage and Tensile Creep Of Sap Modified Concretementioning

confidence: 99%

Anomalies of Shrinkage and Tensile Creep of Concrete

Reinhardt¹

2015

Concreep 10

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Experiments have shown that shrinkage of concrete is larger in those specimens which are loaded in tension compared to non-loaded specimens. The hypothesis is that this is a consequence of microcracking and increase of water diffusivity. Water diffusivity is indeed increased by tensile loading as several researchers have demonstrated. That shrinkage is increased by tensile loading is in contradiction to other theories which state that surface cracking is caused by eigenstresses during drying and thus the shrinkage strain is reduced. Several experimental series have been carried out on concretes with various strength and composition which have confirmed the phenomenon. Another phenomenon has been observed on concrete which was mixed with superabsorbent polymers (SAP). Superabsorbent polymers are a new class of admixture. They absorb a manifold of water compared to the own weight. Mixed in concrete, they store the water and release it during the hydration of cement. They can be used for internal curing of highperformance concrete, further, they can heal cracks and can make concrete more impervious. Tensile creep tests have been performed on dogbone shaped specimens. It appeared that tensile creep of SAP modified concrete was considerably reduced while shrinkage was not. The reason for this behavior is attributed to self-healing of microcracks. Results will be shown and discussed.

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“…Although the use of SAPs as internal curing agents in cementitious materials has been previously documented in the literature (Jensen & Hansen 2001;Jensen & Hansen 2002;Mechtcherine & Reinhardt 2012;Mechtcherine et al 2013;Klemm & Sikora 2013) their suitability for general use, in particular in blended cements with GGBS, is still not clearly articulated and cohesive. Beushausen et al (2014) have been investigated the influence of SAPs on strength and durability properties of blended cements mortars, including GGBS.…”

Section: Introductionmentioning

confidence: 99%

Effect of Superabsorbent Polymers (SAP) on Fresh State Mortars with Ground Granulated Blast-Furnace Slag (GGBS)

Almeida¹,

Klemm²

2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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Although cementitious materials are the main construction materials and worldwide produced, there is still a major concern about their sustainability and durability, especially in terms of conserving resources, reducing wastes and decreasing the environmental impacts of repair and replacement. In general, cementitious materials are very susceptible to cracking provoked by autogenous shrinkage due to their associated self-desiccation process. The problem is even more critical in concrete with blended cements, including Portland cement with ground granulated blast-furnace slag (GGBS). The current paper evaluates efficiency of superabsorbent polymers (SAP) as internal curing agents; shrinkage reduction in mortars with different levels of cement replacement by GGBS (0%, 25%, 50% and 75%) is presented. The study is focused on three types of SAPs with different water absorption/desorption capacities (SAP I: 10 g/g, SAP II: 25-30 g/g and SAP III: 35 g/g in cement paste solution). Tests of consistency, density, air content of fresh mortar, setting times and autogenous shrinkage are analysed. The results showed that mortars with SAP can significantly reduce autogenous shrinkage for any studied GGBS content in comparison with the reference mortar. The reduction of autogenous shrinkage by SAP may decrease the cracking susceptibility and hence increase the sustainability level of the material for more durable constructions.

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Use of superabsorbent polymers (SAP) as concrete additive

Cited by 74 publications

References 14 publications

Effect of submicron admixtures on mechanical and self‐healing properties of cement‐based composites

Effect of submicron admixtures on mechanical and self‐healing properties of cement‐based composites

Anomalies of Shrinkage and Tensile Creep of Concrete

Effect of Superabsorbent Polymers (SAP) on Fresh State Mortars with Ground Granulated Blast-Furnace Slag (GGBS)

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