Preparation and characterization of amphoteric polycarboxylate and the hydration mechanism study used in portland cement

Ren, Qinyu; Zou, Huawei; Liang, Mei; Wang, Yongmei; Wang, Jinchun

doi:10.1039/c4ra05542j

Cited by 41 publications

(19 citation statements)

References 18 publications

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“…Figure shows infrared spectra of the PCs. The spectra of both CPC and TPC samples do not exhibit any absorption signal in the range of 2500–2000 cm −1 , suggesting that no double bonds were formed in the molecules . The peaks at 1290 and 1106 cm −1 can be ascribed to the antisymmetric and symmetric stretching vibration absorption peaks of PEG (COC), while the characteristic band at 1725 cm −1 corresponds to the stretching vibration of COO – .…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization, and performance of a novel polycarboxylate superplasticizer with a crosslinked topological structure

Zhao

Liao

Wang

et al. 2018

J of Applied Polymer Sci

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In this work, a novel crosslinked topological polycarboxylate superplasticizer (TPC) was successfully synthesized. In comparison with conventional comb‐shaped superplasticizer (CPC), the TPC performed better dispersion maintaining stronger water reduction capabilities. The TPC provided a large spherical space due to its crosslinked molecular structure, which was the main reason for enhanced dispersion performance. It was evident that the addition of TPC leads to a delayed and lowered heat flow peak during the early stage of the hydration process. Thermogravimetric analysis showed that the hydrated products exhibited a more stable performance in the presence of the TPC. Changing the molecular structure from a comb‐shape to a crosslinked topological could effectively improve the comprehensive performances of the PCs. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46716.

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Section: Resultsmentioning

confidence: 99%

Synthesis, characterization, and performance of a novel polycarboxylate superplasticizer with a crosslinked topological structure

Zhao

Liao

Wang

et al. 2018

J of Applied Polymer Sci

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“…Compared with P‐0, P‐6Si manifested the diffraction peak of Si and higher peak intensity of cristobalite. In XRD patterns, peak intensities of a certain phase between different samples under the same condition are proportional to the phase content . Therefore, the higher peak intensity was related to higher cristobalite content in P‐6Si which was attributed to the oxidation of Si during calcination (reaction 4).…”

Section: Resultsmentioning

confidence: 99%

“…In XRD patterns, peak intensities of a certain phase between different samples under the same condition are proportional to the phase content. 29 Therefore, the higher peak intensity was related to higher cristobalite content in P-6Si which was attributed to the oxidation of Si during calcination (reaction 4). No trace of Al was observed in calcined P-6Al, while Si was detected instead.…”

Section: Xrd Analyses Of Calcined Pastesmentioning

confidence: 99%

Influence of expansion admixtures on the properties of water‐glass‐based refractory pastes

Tao

Wang

Ren

et al. 2017

Int J Applied Ceramic Tech

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Water‐glass‐based pastes show good prospect for high‐temperature applications, but they are subject to substantial dry‐shrinkage. Silicon and aluminum powders were added to prevent the dry‐shrinkage. The influence of them on compressive strength, bonding strength and volume of the pastes was discussed. SEM, XRD, and TG/DSC were employed to study the influencing mechanisms. The results show that Si and Al effectively prevented the dry‐shrinkage; Al improved compressive strength and bonding strength, while Si was bad for bonding strength. When Al dosage was 6%, the pastes presented mild expansion of 1.05%, the compressive strength increased by 8.9%, and the bonding strength by 33.4%.

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“…Extensive efforts in the scientific and industrial community have been made toward modifying the chemical structure of PCs and most of these modifications have focused on altering of the functional groups . Ren et al . designed a series of comb‐like amphoteric polycarboxylic (APC) polymers with [2‐(methacryloyloxy) ethyl] trimethyl ammonium chloride (MAEAC) as a cement dispersant.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the clay sensitivity and cement hydration process of modified HPEG‐type polycarboxylate superplasticizers

Zhao

Liao

Nian

et al. 2018

J of Applied Polymer Sci

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In this work, three kinds of HPEG-type polycarboxylate superplasticizers (PCs) were synthesized with three kinds of typical functional monomers: [diallyl dimethyl ammonium chloride (DMDAAC), 2-hydroxyethyl methacrylate (HEMA), and 2-(dimethylamino) ethyl methacrylate (DMAM), respectively. The effects of montmorillonite clay on the fluidity of cement/PC pastes were investigated. It was found that the fluidity was negatively affected by the clays in the order: DMAM-PC < HEMA-PC < conventional PC (CPC) < DMDAAC-PC. The DMAM-PC was found to disperse cement well even in presence of montmorillonite clay. The dispersion performance of DMDAAC-PC was much more effectively affected by clay due to the reaction between ammonium and montmorillonite. More study including mortar fluidity, adsorption behavior and morphology of the cement samples were investigated in details. Thermogravimetric analysis and X-ray diffraction experiments allowed us to observe the influence of PCs on the hydrated products.

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Preparation and characterization of amphoteric polycarboxylate and the hydration mechanism study used in portland cement

Cited by 41 publications

References 18 publications

Synthesis, characterization, and performance of a novel polycarboxylate superplasticizer with a crosslinked topological structure

Synthesis, characterization, and performance of a novel polycarboxylate superplasticizer with a crosslinked topological structure

Influence of expansion admixtures on the properties of water‐glass‐based refractory pastes

Investigation of the clay sensitivity and cement hydration process of modified HPEG‐type polycarboxylate superplasticizers

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