Sorption kinetics of superabsorbent polymers (SAPs) in fresh Portland cement-based pastes visualized and quantified by neutron radiography and correlated to the progress of cement hydration

Schroefl, Christof; Mechtcherine, Viktor; Vontobel, Peter; Hovind, Jan; Lehmann, Eberhard

doi:10.1016/j.cemconres.2015.05.001

Cited by 121 publications

(73 citation statements)

References 31 publications

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“…This particular behaviour depends on the density of anionic functional groups, the cross-linking density of the polymers, and other chemical parameters [11]. The inherent sorption kinetics of SAP as observed in the experiments with cement pore solution mirror the behaviour of SAP in cement paste well, as proven by the investigation using neutron radiography imaging [12]. It was also shown that the solution-retentive types of SAP perform much better in comparison to the spontaneous-release types of SAP in terms of mitigating autogenous shrinkage [11] and enhancing the freeze-thaw resistance of concrete.…”

Section: Relevant Properties Of Sap For Concrete 2 Applicationsmentioning

confidence: 59%

Use of superabsorbent polymers (SAP) as concrete additive

Mechtcherine

2016

RILEM Tech Lett

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Superabsorbent polymers (SAP) are new, very promising multipurpose chemical admixtures for concrete. They make available a number of new possibilities with respect to the control of free water in the mixture. In turn they contribute to the control of the rheological properties of fresh concrete and to the mitigation of autogenous and plastic shrinkage through internal curing. Furthermore, pore systems built up as a result of SAP addition seem to remain stable regardless of the consistency of the concrete, the addition of superplasticizers, or the method of placement and compacting. Thus, SAP can be used as an alternative to air-entrainment agents. This article presents these and other potential practical applications of SAP in concrete construction.

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Section: Relevant Properties Of Sap For Concrete 2 Applicationsmentioning

confidence: 59%

Use of superabsorbent polymers (SAP) as concrete additive

Mechtcherine

2016

RILEM Tech Lett

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“…Kinetics of absorption and water absorption capacity (WAC) of SAP have been evaluated by the teabag method (Schroefl et al 2015;Schröfl et al 2012Schröfl et al , 2017. Masses of SAP gel were recorded at 1, 5, 10, 30, 60, 180 and 1440 min after tea-bag immersion.…”

Section: Methodsologymentioning

confidence: 99%

Characterization of Polyacrylamide based Superabsorbent Polymers for potential use in PC Matrices with Supplementary Cementitious Materials

2018

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This paper compares three types of polyacrylamide based Superabsorbent Polymers (SAP) with different water absorption capacities for potential application in Portland cement composites. The analysed matrices contain Supplementary Cementitious Materials (SCM) such as ground granulated blast-furnace slag (GGBS), fly ash (FA type F), silica fume (SF) and lime (NHL 5). SAPs were characterized in terms of shape, size and molecular structure by the Laser Diffraction, SEM, and the Raman Spectroscopy techniques. Kinetics and capacity of SAPs absorption in different environments (deionised water, PC solution and various PC-SCMs solutions) were evaluated by the tea-bag method. pH of all solutions was determined after 24 hours. The effect of different SCMs on SAPs sorption behaviour has been presented. The experimental results show that SAPs do not affect pH of cementitious solutions. However, SCMs addition reduces SAPs' absorption capacity and increase their desorption features. This is related not only to the type of SCM, but also to the level of substitution.

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“…The issue of water sorption by superabsorptive polymers in cement paste was tackled by the authors of [10]. Sorption kinetics was evaluated on the basis of neutron radiography on the samples of cement paste of w/c ratio = 0.25 and 0.50, and cement paste containing silica fume with w/c = 0.42.…”

Section: Introductionmentioning

confidence: 99%

Sorptive testing of mortars with varying water-cement ratios

Stolarska

Ciborowski

2018

E3S Web Conf.

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The article presents the results of studies on sorption performed on three samples of mortars with similar density of about 2,000 kg/m 3 . The tested mortars differed in their water-to-cement ratio. Three levels of w/c ratio were adopted that were respectively: 0.5; 0.55 and 0.6. The prepared mortars were cut into samples with a thickness of 1 cm, dried to constant weight at a temperature of 105°C and insulated on the side surface with silicone. The experiment was carried out at a temperature of 25°C and at six different levels of relative humidity ϕ ≈ 12, 33, 54, 76, 85, 98%. Relative humidity was provided by saturated solutions of the appropriate salts: LiCl (ϕ ≈ 12%), MgCl 2 (ϕ ≈ 33%), Mg(NO 3 ) 2 (ϕ ≈ 53%), NaCl (ϕ ≈ 76%), KCl (ϕ ≈ 85%), K 2 SO 4 (ϕ ≈ 98%). The adopted level of temperature and range of relative humidity meet the hygrothermal conditions which tend to affect the cement mortar in real life. The long-term measurement results were used to assess the behaviour of the tested mortars under various conditions of moisture and to determine the equilibrium sorptive humidity.

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Sorption kinetics of superabsorbent polymers (SAPs) in fresh Portland cement-based pastes visualized and quantified by neutron radiography and correlated to the progress of cement hydration

Cited by 121 publications

References 31 publications

Use of superabsorbent polymers (SAP) as concrete additive

Use of superabsorbent polymers (SAP) as concrete additive

Characterization of Polyacrylamide based Superabsorbent Polymers for potential use in PC Matrices with Supplementary Cementitious Materials

Sorptive testing of mortars with varying water-cement ratios

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