Adsorptive behavior of surfactants on surface of Portland cement

Zhang, T; Shang, Shuo; Yin, Fan; Aishah, A; Salmiah, A.; Ooi, Tian Lye

doi:10.1016/s0008-8846(01)00511-7

Cited by 97 publications

(45 citation statements)

References 9 publications

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“…This action can be applied to all four types of SPs; SPs like NSF and AS contain benzene group, whose π electrons can be easily polarized by solid polar group and induce adsorption on solid surface. The result of higher adsorption amount of PCE in contrast to other types of SPs on β-C 2 S is not in accordance with the adsorption results reported on cement particles [11][12][13] . Along with the results of ζ-potential as shown in Fig.7, the result is reasonable from the fact that PCE is a type of non-ionic polymer dispersant, which means a weaker electrical repulsion force from β-C 2 S. The less adsorption amount of AS has something relation to its loose adsorption pattern, which is considered being adsorbed in "loop" mode [14] .…”

Section: The Adsorption Mechanism and Mode Ofcontrasting

confidence: 83%

Chemical structures and adsorptive behaviors of superplasticizers on β-C2S

Wang

Zhao

Cui

2007

J. Wuhan Univ. Technol.

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The chemical structures of four types of superplasticizers(SPs)and their adsorptive behaviors on β-C 2 S were investigated. The adsorption properties of SPs on β-C 2 S were measured and the relationship between the adsorption quantity and the specifi c surface of β-C 2 S was analyzed. The experimental results show that the adsorption quantity increases with the surface area increase of β-C 2 S, but the adsorption quantity per surface area is similar, which means that the main adsorbent is β-C 2 S itself. Polycarboxylic ester (PCE) showed the highest adsorption amount on β-C 2 S, followed by β-naphthalene sulfonates (NSF) and formaldehyde-acetone condensates sulfonates (FAS), amino sulphonate (AS) showed the least adsorption amount on β-C 2 S. PCE affected the surface potential of β-C 2 S particles in water differently in comparison with other types of SPs. The adsorption capacity of SPs on β-C 2 S is determined by factors such as molecular structure, functional groups and molecular weight of SPs.

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Section: The Adsorption Mechanism and Mode Ofcontrasting

confidence: 83%

Chemical structures and adsorptive behaviors of superplasticizers on β-C2S

Wang

Zhao

Cui

2007

J. Wuhan Univ. Technol.

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“…The adsorption leads to the inhibition of the hydration reaction resulting in the reduction of the formation of Ca(OH) 2 . Zhang et al [203] investigated adsorption using zeta potential measurements and proposed a similar model.…”

Section: Dispersantsmentioning

confidence: 99%

Conversion of technical lignins to functional materials with retained polymeric properties

Matsushita

2015

J Wood Sci

155

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A significant amount of technical lignins is produced in the pulp and paper industries. However, most technical lignins are burned for thermal recycling and a few percent are used as materials, such as lignosulfonate as a dispersant. Native lignin has a highly complex structure and is susceptible to structural variations depending on the pulping process, thus hindering the effective utilization of lignins. The procedures used to convert lignins into functional materials include depolymerization to monomeric fragments followed by re-building to functional materials, and chemical modifications to generate functional polymers with retained polymeric properties. In this paper, the latter is disserted. The characteristics of technical lignins, which include kraft lignin, lignosulfonate, and organosolv lignin, and their conversion to functional materials such as polyesters, polyethers, polyurethanes, etc. and the applications of lignin-based materials in some fields are discussed.

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“…Hydrophobic treatment prevents wetting of the concrete's porous structure. A great number of organic additives have been studied as hydrophobic reagents including alkyl-alkoxy silane [5,6], surfactants [7,8], acrylic and polyurethane [6,9]. Concrete carbonation is a process in which carbondioxide reacts with calcium hydroxide [10][11][12] in the cement matrix to form calcium carbonate and water and the reaction stoichiometry is: Ca(OH) 2 + CO 2 → CaCO 3 + H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Calcium Carbonate for Cement Surface

et al. 2017

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This report describes a novel way to generate a highly effective hydrophobic cement surface via a carbonation route using sodium stearate. Carbonation reaction was carried out at different temperatures to investigate the hydrophobicity and morphology of the calcium carbonate formed with this process. With increasing temperatures, the particles changed from irregular shapes to more uniform rod-like structures and then aggregated to form a plate-like formation. The contact angle against water was found to increase with increasing temperature; after 90 • C there was no further increase. The maximum contact angle of 129 • was obtained at the temperature of 60 • C. It was also found that carbonation increased the micro hardness of the cement material. The micro hardness was found to be dependent on the morphology of the CaCO 3 particles. The rod like structures which caused increased mineral filler produced a material with enhanced strength. The 13 C cross polarization magic-angle spinning NMR spectra gave plausible explanation of the interaction of organic-inorganic moieties.

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Adsorptive behavior of surfactants on surface of Portland cement

Cited by 97 publications

References 9 publications

Chemical structures and adsorptive behaviors of superplasticizers on β-C2S

Chemical structures and adsorptive behaviors of superplasticizers on β-C2S

Conversion of technical lignins to functional materials with retained polymeric properties

Hydrophobic Calcium Carbonate for Cement Surface

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