Effects of core-shell polycarboxylate superplasticizer on the fluidity and hydration behavior of cement paste

Chen, Shengli; Sun, Shenmei; Chen, Xiaolong; Zhong, Ke; Shao, Qiang; Xu, Hongyao; Wei, Jiangxiong

doi:10.1016/j.colsurfa.2020.124464

Cited by 25 publications

(8 citation statements)

References 42 publications

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“…The density of carboxyl groups in the main chain has a significant influence on the adsorption effect of PCE on cement particles. First, the increased density of carboxyl groups can enhance the adsorption capacity of PCEs [ 12 , 20 ]. However, different molecular structures will have different optimal carboxyl densities.…”

Section: Resultsmentioning

confidence: 99%

“…This occurs based on the electrostatic interaction. While adsorbed, the polymer promotes the dispersion of the cement particles due to the steric hindrance produced by its side chains containing polyethylene glycol (PEG) structures [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. As a result, the water entrapped in the agglomerated binder particles can be released, increasing the flowability and reducing the viscosity of cement paste [ 22 , 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of the Use of Polymers in High-Performance Concrete Containing Silica Fume

Harichane,

Seghir,

Niewiadomski

et al. 2023

Polymers

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The incorporation of polycarboxylate ether superplasticizer (PCE)-type polymers and silica fume (SF) in high-performance concretes (HPC) leads to remarkable rheological and mechanical improvements. In the fresh state, PCEs are adsorbed on cement particles and dispersants, promoting the workability of the concrete. Silica fume enables very well-compacted concrete to be obtained, which is characterized by high mechanical parameters in its hardened state. Some PCEs are incompatible with silica fume, which can result in slump loss and poor rheological behavior. The main objective of this research is to study the influence of three types of PCEs, which all have different molecular architectures, on the rheological and mechanical behavior of high-performance concretes containing 10% SF as a partial replacement of cement. The results show that the carboxylic density of PCE has an influence on its compatibility with SF.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effectiveness of the Use of Polymers in High-Performance Concrete Containing Silica Fume

Harichane,

Seghir,

Niewiadomski

et al. 2023

Polymers

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“…Each ester bond can be hydrolyzed under alkaline conditions to produce an additional carboxylic group for adsorption. Recently, micelle-and core-shell-structured polycarboxylates have been synthesized via emulsion polymerization [129,130]. After the gradual hydrolysis of the hydrophobic acrylate unit, disassociation of the micelle and core-shell structures occurs, releasing more carboxylic groups to promote adsorption.…”

Section: Modification Of Adsorption Behaviormentioning

confidence: 99%

Advances in Organic Rheology-Modifiers (Chemical Admixtures) and Their Effects on the Rheological Properties of Cement-Based Materials

et al. 2022

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Organic rheology modifiers, especially superplasticizers and viscosity-modifying admixtures (VMAs), have become key components for the workability optimization of modern concrete. The development of these admixtures is crucial to the further performance improvement of modern concrete under different casting and service conditions. Many of the former reviews have summarized research advances in respect of these admixtures from chemical and material perspectives, focusing on the effects of structure and the performance. In this paper, from a rheological perspective, an overview is provided of the microscale behavior of polycarboxylate (PCE) superplasticizers and VMAs (e.g., adsorption, conformation, and bridging) in terms of the evolution of the microstructure of the paste, the effect of chemical structure on the yield stress, the apparent viscosity and thixotropy of cement-based materials, and the structure design of these admixtures. Most importantly, in addition to a general discussion with assumptions (monolayer adsorption of a “flat” conformation, with each molecule on a single particle; statistical polymer composition), special conditions (e.g., preferential adsorption, depletion effects, hydration modification effects, and the polydispersity of the polymer composition) are discussed. Newly developed admixtures, realized through regulation of the microscale behavior, and by the modification of adsorption, topological structure, and molecular frame, are introduced.

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“…As shown in Figure 5, the spectra of all PCE samples are basically the same. e intensity and position of some absorption peaks are slightly different, which indicates that the composition of different PCEs is different [28,29]. e peak location provides the structural information of the sample, and the peak intensity corresponds to the information of molecular concentration in the sample.…”

Section: Spectral Characteristics Of Pcementioning

confidence: 99%

Rapid Identification and Quantitative Analysis of Polycarboxylate Superplasticizers Using ATR-FTIR Spectroscopy Combined with Chemometric Methods

Zhao³

et al. 2021

Mathematical Problems in Engineering

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Although the quality inspection method of polycarboxylate superplasticizers (PCE) based on macroperformance is still widely used, it has the drawbacks of time-consuming and low precision. This study aims to develop a practicable alternative method for quality inspection of PCE. For this, spectra collection, feature extraction, and cluster analysis were performed up on the PCE samples to demonstrate the feasibility of the method. Also, a new similarity calculation method was introduced in this work. Results show that the solid PCE sample for spectrum collection can be prepared using the simple heating method. High-quality spectra can be rapidly collected by infrared spectrometer combined with ATR accessory. Meanwhile, the accuracy of classification and clustering is high, suggesting that the feature extraction method based on principal component analysis (PCA) is effective. In addition, compared with conventional similarity calculation methods of cosine angle and correlation coefficient, the new similarity calculation method achieves better classification results and better generalization ability. This work provides a method of quantitative analysis and rapid identification of PCE for the construction site.

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Effects of core-shell polycarboxylate superplasticizer on the fluidity and hydration behavior of cement paste

Cited by 25 publications

References 42 publications

Effectiveness of the Use of Polymers in High-Performance Concrete Containing Silica Fume

Effectiveness of the Use of Polymers in High-Performance Concrete Containing Silica Fume

Advances in Organic Rheology-Modifiers (Chemical Admixtures) and Their Effects on the Rheological Properties of Cement-Based Materials

Rapid Identification and Quantitative Analysis of Polycarboxylate Superplasticizers Using ATR-FTIR Spectroscopy Combined with Chemometric Methods

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