Synthesis and Evaluation of Polycarboxylate-Type Superplasticizers with Different Carboxylic Contents Used in a Cement System

Peng, Xiong; Yi, Cong; Deng, Yonghong; Qiu, Xue Qing

doi:10.1080/00914037.2010.551369

Cited by 20 publications

(6 citation statements)

References 27 publications

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“…In the absence of PC, the preferential adsorption of Ca 2þ or Ca(OH) þ on to the hydrated products leads to the appearance of the positive potential on the cement grains (Kong et al, 2006). However, when PC is adsorbed on the surface of cement particles, the shear plane between the Stern layer and the diffuse becomes a greater distance from the cement particle surface, while the negative charge of the particles is produced by the adsorption of anionic groups, causing overcompensation of the positive surface charge (Peng et al, 2011).…”

Section: Resultsmentioning

confidence: 96%

Effect of side chains on the dispersing properties of polycarboxylate-type superplasticisers in cement systems

Peng¹,

Li²,

Chen³

et al. 2013

Magazine of Concrete Research

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To study the effect of side chains on the dispersing properties of polycarboxylate-type superplasticisers (PCs) in cement pastes, PCs with different side chains were synthesised and used as a superplasticiser for cement suspensions. The effect of side chains of PC on the zeta potential, adsorption, fluidity of the corresponding cement suspensions was investigated systematically, and total interparticle potential energy between particles was calculated. The results show that the higher the short side chains ratio of PC, the larger the adsorption amount of PC. PC with both short and long side chains presents a better dispersing property than PC with short side chains, while PC with long side chains falls in between. The maintaining dispersing ability of PC for cement particles increases as the short side chains ratio increases. The changing rule of total interparticle potential energy produced by PC is in accordance with the changing rule of dispersing property of PC in cement pastes. This indicates that the calculated results of total interparticle potential energy further support the explanation of dispersing property difference of PC in theory. This paper uses the sum of electrostatic energy and steric hindrance potential as the total interparticle potential energy to evaluate the dispersing property of PC for the first time, which is meaningful for the evaluation of dispersing property of polymer dispersant adsorbed on particle surfaces. NotationA Hamaker constant a particle radius c equilibrium concentration of solute (mg . l À1 ) e charge of an electron F 0 , F t initial fluidity and fluidity with elapsed time h interparticle separation distance I ionic strength of the solution k equilibrium constant (l . mg À1 ) k B Boltzmann's constant Mw molecular weight of the polymer m average number of side chains in a comb-like copolymer N A Avogadros number (r 2 o ) 1=2 mean distance between the chains ends in the free solution S function of the segment density distribution S BET BET specific surface area T absolute temperature v number of adsorbed chains per unit area V elect electrostatic energy V steric steric effect V T total interparticle potential energy V vdwc van der Waals potential energy AE expansion coefficient adsorption amount (mg . g À1 ) 1maximum adsorption amount (mg . g À1

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Section: Resultsmentioning

confidence: 96%

Effect of side chains on the dispersing properties of polycarboxylate-type superplasticisers in cement systems

Peng¹,

Li²,

Chen³

et al. 2013

Magazine of Concrete Research

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“…Peng et al [61] showed that the effectiveness of the polycarboxy late superplasticizers grafted with poly(ethylene oxide) depends strictly on the molar mass of the polymer used. In other research, Peng et al [14] synthesized six polycarboxylates with similar molar mass and dispersion and constant length of side chains of poly(ethylene oxide) [p = 45, Formula (I)], varying in the content of the carboxylate groups (i.e., molar ratio of the monomers used) ( Table 4). The consistence of the cement mortar vs. amount of the admixtures as well as ability of the particular superplasticizers to reduction of the water content in the mix are presented in Fig.…”

Section: Influence Of the Chemical Structure Of Polycarboxylates On Tmentioning

confidence: 99%

“…Numerous studies, for instance Winnefeld et al [13], Peng et al [14], Kjeldsen et al [15], Ran et al [16], Zingg et al [17,18], Rai and Gajbhiye [19], Üzer and Plank [20], have proved that the superplasticizers in the cement pastes directly influence their rheological properties. It is commonly accepted that the influence of superplasticizers on rheology of cement binder mixture depends primarily on the superplasticizer and cement characteristics and their interaction.…”

mentioning

confidence: 99%

“…It is commonly accepted that the influence of superplasticizers on rheology of cement binder mixture depends primarily on the superplasticizer and cement characteristics and their interaction. Effects of PCEs on increasing workability [13,21,22] and fluidity [14,[23][24][25][26][27][28][29][30][31][32][33] of fresh concrete have already attracted many attentions so far. The authors reported that PCEs have a good performance on improving workability of concrete and fluidize the mixture more effectively than other superplasticizers.…”

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confidence: 99%

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Polymeric superplasticizers based on polycarboxylates for ready-mixed concrete: current state of the art

2016

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Chemical admixtures are one of the basic components of the contemporary concrete. The most important admixtures are superplasticizers, i.e. the modifiers which allow for high-range reducing of the water content in the concrete mix. The most effective superplasticizers are based on polycarboxylates and their derivatives. The state of the art in the range of polycarboxylate admixtures for concrete is presented in the paper. The methods of synthesis and modification of carboxylic polymers are characterized and the mechanism of action of polycarboxylate superplasticizers is described. The influence of the chemical structure of polycarboxylates on the consistence of the concrete mix, as well as the prognosis of the superplasticizers development is also presented.

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“…Latex can be used in water and is compatible with Portland cement. The use of polymer as a modifier in new structures seems to be a promising strategy in improving micro structure and enhancing the durability of cement mortar and concrete [2][3][4][5] as well as they improve the physical properties of the concrete such as bonding and tensile, compressive and flexural strengths [6] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Styrene Butadiene Ratio on Mechanical Properties of Concrete Mixture

Singh

Goswami

Santra

2012

Polymer-Plastics Technology and Engineering

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Experiments were carried out to study the mechanical properties of concrete modified by Carboxylated styrene-butadiene rubber (X-SBR) polymer, using mortar samples with various styrene butadiene ratios. The incorporation of X-SBR improved the mechanical properties of the concrete. The data suggest that admixing X-SBR led to denser and more refined microstructure of the cured cement mortar. Compressive strength and Flexural strength graph confirmed such improvements in the pore structure and the formation of an interpenetrating network structure of X-SBR and cement hydrate phases at relatively higher styrene butadiene ratios.

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Synthesis and Evaluation of Polycarboxylate-Type Superplasticizers with Different Carboxylic Contents Used in a Cement System

Cited by 20 publications

References 27 publications

Effect of side chains on the dispersing properties of polycarboxylate-type superplasticisers in cement systems

Effect of side chains on the dispersing properties of polycarboxylate-type superplasticisers in cement systems

Polymeric superplasticizers based on polycarboxylates for ready-mixed concrete: current state of the art

Effect of Styrene Butadiene Ratio on Mechanical Properties of Concrete Mixture

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