Tailoring the solution conformation of polycarboxylate superplasticizer toward the improvement of dispersing performance in cement paste

Shu, Xin; Ran, Qianping; Liu, Jiaping; Zhao, Hongxia; Zhang, Qian; Wang, Xiumei; Yang, Yong; Liu, Jinzhi

doi:10.1016/j.conbuildmat.2016.04.127

Cited by 102 publications

(34 citation statements)

References 47 publications

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“…Therefore, the peak shifts of nC1 and nC2 dispersions compared to the starting XDB powder NMt do not correspond to errors, but rather represent different enthalpy of the nanocomposite. 37 Lastly, the dispersed inorganic nC3 (Figure 14 and Table 4) showed a typical decomposition behavior with three primary mass losses. The first significant one occurred at around 85 °C with a right shoulder at 110 °C and was attributed to the loss of the adsorbed interlayer water.…”

Section: Thermal Gravimetrymentioning

confidence: 93%

Inorganic and organomodified nano-montmorillonite dispersions for use as supplementary cementitious materials – a novel theory based on nanostructural studies

Papatzani

Paine

2017

Nanocomposites

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The compatibility of three nano-montmorillonite (NMt) dispersions in hydrating cement binders was investigated and a new theory linking the nanostructure of nanoclay dispersions to their effect on the macroscale performance of cement pastes is presented. Two aqueous organomodified NMt dispersions (one dispersed with non-ionic fatty alcohol and the other with anionic alkyl aryl sulfonate) and one aqueous inorganic NMt dispersion (dispersed with sodium tripolyphosphate) were characterized via transmission electron microscopy imaging and crystallography, X-ray diffraction, Scanning electron microscopy/X-ray energy dispersive spectroscopy, and thermogravimetric analysis/differential thermogravimetry. With this characterization protocol, the way carbon loading and surfactants interact with the nanostructure of the nanoclay dispersions in light of their addition in composite cements was clarified. The suggested methodology is suited for the characterization of nanoclay dispersions and the new theory developed will open up a new horizon for the understanding and exploitation of nano-montmorillonite as a supplementary cementitious material.

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Section: Thermal Gravimetrymentioning

confidence: 93%

Inorganic and organomodified nano-montmorillonite dispersions for use as supplementary cementitious materials – a novel theory based on nanostructural studies

Papatzani

Paine

2017

Nanocomposites

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“…Furthermore, nS particles dispersed in a polycarboxylate medium promise water reduction capacity due to the repulsion and steric hindrance of the hydrating cement particles preventing coagulation (Shu et al, 2016), while at the same time allowing for greater strength development.…”

Section: Introductionmentioning

confidence: 99%

Polycarboxylate/nanosilica-modified quaternary cement formulations – enhancements and limitations

Paine

2018

Advances in Cement Research

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2The effect of polycarboxylate/nanosilica (nS) particles in quaternary cement formulations comprising Portland cement (PC), limestone powder (LS) and fly ash (FA) was investigated for the first time. The reference formulation contained 60% PC, 20% LS and 20% FA by mass of binder in an effort to minimise clinker and maximise the other constituents. nS particles were characterised by way of transmission and X-ray scanning electron microscopy (SEM). The nS was added at 0·3 or 0·6% by mass as a partial replacement for PC and different water-to-binder (w/b) ratios were explored. Compressive strength tests and thermal gravimetric analyses (TGA) performed at day 7, 28 and 56 testified to pozzolanic behaviour. Results suggest a mechanism of 'de-activation' of some FA particles with age. A new ratio: (compressive strength in MPa)/(calcium hydroxide content detected by TGA) was introduced, correlating microscale characteristics (hydration products) and macroscale performance (delivered compressive strengths). Back-scattered SEM images confirmed the calcium-silicate-hydrate (C-S-H) network formation, the presence of reacted/unreacted FA particles and the availability of calcium hydroxide for delayed hydration reactions. Tests on mortars also confirmed the enhancement offered by nS addition. The lower bound nS addition was determined to be 0·6% by mass of binder for pastes and 0·5% for mortars.Notation D relative density m a mass of specimen in air m w apparent mass of specimen immersed in water w/b water-to-binder ratio ρ w density of water

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“…Shu et al . demonstrated that the variation of monomer ratios in PCEs could be used to tune the content of methyl groups substituted on the polymer backbones as well as the backbone hydrophobicity and stiffness.…”

Section: (Meth)acrylated Pegs As Spsmentioning

confidence: 99%

(Meth)acrylated poly(ethylene glycol)s as precursors for rheology modifiers, superplasticizers and electrolyte membranes: a review

2017

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This review summarizes current trends in (meth)acrylated poly(ethylene glycol) (PEG) systems in the last decade, with a specific focus on their most important applications, including associative rheology modifiers, superplasticizers and electrolyte membranes. Associative rheology modifiers based on (meth)acrylated PEGs have significantly contributed to improvement of the application characteristics of waterborne coatings. These materials are employed by paint formulators to provide proper viscosity profiles across an entire shear range encountered in various paint applications. In the cement and concrete industry, superplasticizers derived from (meth)acrylated PEGs have also opened the doors to advances in this area, because of their ability to produce cementitious materials with lower water content and without compromising workability. In addition, development of solid electrolyte membranes based on photo-curable (meth)acrylated PEGs for use in polymer lithium ion batteries has recently attracted increasing attention in the energy storage industry. This review provides a comprehensive overview of the structural investigations and applications of (meth)acrylated PEGs and serves as a starting point for future studies.Over the past few decades, one of the major challenges in the energy storage industry has been developing solid electrolytes

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Tailoring the solution conformation of polycarboxylate superplasticizer toward the improvement of dispersing performance in cement paste

Cited by 102 publications

References 47 publications

Inorganic and organomodified nano-montmorillonite dispersions for use as supplementary cementitious materials – a novel theory based on nanostructural studies

Inorganic and organomodified nano-montmorillonite dispersions for use as supplementary cementitious materials – a novel theory based on nanostructural studies

Polycarboxylate/nanosilica-modified quaternary cement formulations – enhancements and limitations

(Meth)acrylated poly(ethylene glycol)s as precursors for rheology modifiers, superplasticizers and electrolyte membranes: a review

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