Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite

Wang, Weishan; Zheng, Bin; Feng, Zhaochi; Deng, Zuiliang; Fu, Liangjie

doi:10.3151/jact.10.323

Cited by 16 publications

(5 citation statements)

References 21 publications

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“…The steeper the concentration gradient, the faster rate of diffusion, and thus the higher the adsorption amount and the saturation capacity for PCE-1 concentrations of 0.1 g/L and 2.5 g/L are 0.051 mg/g to 0.114 mg/g, respectively. Similar adsorption kinetics were also seen in studies by Wang et al, Bulut et al, and Karagozoglu et al where they studied absorption on clays (sepiolite or bentonite) instead of stone powder [ 24 , 25 , 26 ].…”

Section: Resultssupporting

confidence: 80%

Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Adsorption on Large Bibulous Stone Powder

Deng

et al. 2021

Materials

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The aim of this paper is to study the adsorption behavior of polycarboxylate superplasticizers (PCE) on coarse aggregates with a property of high water consumption (above 2%). The coarse aggregates were ground into a powder to create large bibulous stone powder, and it was observed that significant amounts of the ether-based PCE were absorbed onto large bibulous stone powder. The adsorption rate immediately reached a maximum after 5 min and then gradually decreased until an equilibrium absorption was established after 30 min. Zeta potential, infrared spectroscopy, and thermogravimetric analysis (TGA) measurements confirmed that the polycarboxylate superplasticizer adsorbed on the surface of the stone powder. Hydrodynamic diameter measurements showed that the polycarboxylate superplasticizer molecules were smaller than pore size, and the surface area and pore volume were reduced by the polymer incorporation in the pores.

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Section: Resultssupporting

confidence: 80%

Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Adsorption on Large Bibulous Stone Powder

Deng

et al. 2021

Materials

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“…The influence of clay minerals on fluidity has been determined quantitatively; when superplasticizers interact with the clay minerals, their fluidity can be reduced significantly (Atarashi et al 2004b;Sakai et al 2006). Wang et al discussed the adsorption of polycarboxylate-based superplasticizer onto natural bentonite (Wang et al 2012). Also, if the molecular structure of comb-type superplasticizer is varied, then the interaction with clay minerals also changes (Lei et al 2012(Lei et al , 2014.…”

Section: Introductionmentioning

confidence: 99%

Interaction between Montmorillonite and Chemical Admixture

Atarashi

Yamada

Itoh

et al. 2015

ACT

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The effect of montmorillonite on the hydration reactions and fluidity of cement paste was investigated using comb-type superplasticizer or sodium gluconate. When comb-type superplasticizer was added, montmorillonite affected the retardation action of the initial hydration reaction in the cement and the dispersion significantly. When sodium gluconate was added, the effect of the montmorillonite on the retardation action was smaller compared with that of the comb-type superplasticizer. The amount of comb-type superplasticizer adsorbed on the cement particles is reduced significantly by the addition of montmorillonite. In the case of sodium gluconate, the amount adsorbed on the cement particles is also decreased by the addition of montmorillonite. However the adsorbed amount of sodium gluconate on montmorillonite is smaller compared with that of superplasticizer on montmorillonite.

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“…Due to the various functions of the PCE and CRA, the adsorption behaviours of PCE and CRA on various adsorbates were examined for comparison, although there is previous work on the adsorption behaviour of PCE ( e.g. Wang et al , 2012; Ait-akbour et al , 2015). The time-dependent adsorption amounts of PCE and CRA on various adsorbates are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Initiator ratio on the adsorption behaviour of PCE (e.g. Wang et al, 2012;Ait-akbour et al, 2015). The time-dependent adsorption amounts of PCE and CRA on various adsorbates are shown in Fig.…”

Section: Sample Monomer Ratiomentioning

confidence: 99%

A novel method for solving the impact of clay on concrete workability: dimensional design and mechanism analysis

Liu

et al. 2020

Clay miner.

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Clay often has severe detrimental impacts on cement-based materials. Therefore, it is necessary to investigate the mechanism causing the deterioration to improve the service life of cement-based materials. Based on accurate dimensional analysis, a mechanism that influences clay is proposed: the intercalation of the side chains of superplasticizer molecules in the interlayer space of the clay. To lessen this harmful effect, a new clay-resistant admixture (CRA) possessing cationic groups of small molecular size was synthesized through a novel dimensional design. The length and width of the side chains of this superplasticizer molecule were 9.50–17.50 and 0.25–0.40 nm, respectively, with a radius of ~3.74 nm in solvent, which is larger than the interlayer spacing of montmorillonite (i.e. 1.09–2.14 nm). The longitudinal and latitudinal lengths of the CRA molecule were 0.468 and 9.456 nm, respectively, ensuring intercalation in the interlayer of montmorillonite. The increase in interlayer spacing of the clay was 0.364 nm following addition of polycarboxylate superplasticizer (PCE) plus CRA and 0.632 nm following addition of PCE, which suggests that the CRA plays the role of a ‘sacrificial agent’ that is preferentially intercalated into the interlayer space of clay to further prevent the side chains of the superplasticizer molecules from entering the interlayer. The aim of this study was to propose a suitable means of synthesizing a new CRA to address the impact of clay through dimensional design and mechanism analysis, which contributes to the theoretical study and technological improvement of cement-based materials.

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Adsorption of Polycarboxylate-based Superplasticizer onto Natural Bentonite

Cited by 16 publications

References 21 publications

Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Adsorption on Large Bibulous Stone Powder

Investigation of the Behavior and Mechanism of Action of Ether-Based Polycarboxylate Superplasticizers Adsorption on Large Bibulous Stone Powder

Interaction between Montmorillonite and Chemical Admixture

A novel method for solving the impact of clay on concrete workability: dimensional design and mechanism analysis

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