Fluidizing effects of polymers with various anchoring groups in cement pastes and their sensitivity to environmental temperatures

Tian, Hongwei; Kong, Xiangming; Sun, Jingwen; Wang, Dongmin; Huang, Chunlong

doi:10.1002/app.47494

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…Additionally, compared to NLPC, SAF greatly outperformed NLPC in terms of adsorption on cement particles, which is due to the difference of their molecular structures, SAF molecules can create multilayer adsorption on cement particles due to their linear nature. [7,9,11,39]. When applied at the same dosage, SAF adsorbed more onto cement particles than NLPC did [11].…”

Section: Adsorption Quantitymentioning

confidence: 92%

Study on synthesis of temperature-resistant polycarboxylic acid dispersant and its application in oil well cement

Feng,

Li,

Peng

et al. 2024

J Sol-Gel Sci Technol

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Polycarboxylic acid dispersant has the advantages of good dispersion performance and environmental protection, and has a good application prospect in oil well cement. However, the current polycarboxylate dispersant has poor temperature resistance, which limits its application in high temperature formation cementing. In this study, a polycarboxylic acid dispersant (NLPC) that can be applied to high temperature cementing was synthesized by free radical copolymerization of monomer isoprenol polyoxyethylene ether, maleic acid, 2-acrylamido-2-methylpropanesulfonic acid and N-vinyl-2-pyrrolidone. The structure of NLPC was characterized by Fourier transform infrared spectroscopy, gel permeation chromatography and 1 H nuclear magnetic resonance spectroscopy. The effects of NLPC on the uidity, rheological properties, thickening time and mechanical strength of cement paste at different temperatures were tested, and compared with the traditional sulfonated acetone-formaldehyde polycondensate (SAF) dispersant. The mechanism of dispersant and its effect on cement hydration behavior were systematically studied by total organic carbon, Zeta potential, particle size analysis, thermogravimetric analysis and X-ray diffraction analysis. The effect of dispersant on the microstructure of hardened cement was analyzed by scanning electron microscopy. The results show that NLPC has excellent high temperature dispersion performance. At 150 ℃, NLPC can signi cantly reduce the consistency coe cient of cement paste, increase the uidity index of cement paste, signi cantly improve the rheological properties of cement paste, and the paste has excellent thickening performance, and the initial consistency is lower than SAF.In addition, due to the good dispersion of cement particles by NLPC, the early mechanical strength of cement stone after solidi cation is also improved. The mechanism analysis shows that NLPC improves the dispersion performance of oil well cement paste mainly through electrostatic repulsion and steric hindrance effect. In short, NLPC overcomes the shortcomings of low e ciency and heavy pollution of SAF dispersant and low applicable temperature of conventional polycarboxylic acid dispersant, and ensures the smooth progress of high temperature deep well cementing construction.

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Section: Adsorption Quantitymentioning

confidence: 92%

Study on synthesis of temperature-resistant polycarboxylic acid dispersant and its application in oil well cement

Feng,

Li,

Peng

et al. 2024

J Sol-Gel Sci Technol

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“…The PCE are composed of two main elements: a) the carboxylate group, which is anionic and allows interaction with the cement surface to produce dispersion and b) a polyethylene oxide side chain or a mixture of polyethylene-polypropylene to increase dispersion (Lei et al, 2022). PCE eliminates the segregation of concrete, gives it excellent dispersion of cement particles in water and accelerates the rate of hydration, setting and hardening (Khudhair et al, 2018), therefore, it increases the compressive strength and workability of concrete (Pereira et al, 2012), which increases the surface potential force, the solid-liquid affinity, and the steric hindrance (Sathyan et al, 2018;Tian et al, 2019), and prolongs the initial and final setting times . PCE superplasticizers were used to modify the surface of the sand in the preparation of the cement mortar and increased its compressive strength at 7 and 28 days of age (Noaman et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Polycarboxylate-based superplasticizer with added silica sub-microspheres for use in Portland cement materials

Ungsson-Nieblas,

Rubio-Rosas,

Vargas-Ortíz

et al. 2023

RMIQ

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“…Therefore, the reason why the poly-phosphate could effectively enhance the dispersion, whilst the mono-phosphate failed cannot be simply explained by the retarding effect. One possible explanation might be attributed to the difference in the molecular structure of the phosphates, which could result in different performance at the water/solid interface during the very early-stage hydration [39][40][41][42], and this would further influence the adsorption layer [43][44][45]. As a consequence, the difference in PCE adsorption behavior could be expected in the presence of different phosphates.In this study, the dispersion mechanism of the PCE-phosphate system was investigated.…”

mentioning

confidence: 99%

Effect of Sodium Hexametaphosphate and Trisodium Phosphate on Dispersion of Polycarboxylate Superplasticizer

Zhang

Liu

et al. 2019

Materials

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Enhancement in dispersion of polycarboxylate superplasticizer (PCE) could be obtained by incorporating retarders in normal concrete. The generally believed reason was that the consumption of free water and polymer at the beginning was reduced by retarding cement hydration. This theory could not convincingly explain why sodium hexametaphosphate (SHMP) was able to promote the dispersion capacity of PCE, while trisodium phosphate (TSP) could not, despite that both TSP and SHMP could obviously retard the cement hydration. The adsorption behavior of PCE and phosphate was investigated and the mechanism was analyzed in order to gain deeper understanding. The results showed that TSP and SHMP delayed the cement hydration, impeded adsorption process of PCE, and increased thickness of adsorption layer. It was interesting that TSP reduced the dispersion, but SHMP enhanced. The reason for this contradiction was due to the difference in composition of adsorption layer. In the PCE-TSP system, this layer was composed of the precipitates (formed by TSP and Ca 2+ ) and the invalided PCE (caused by these precipitates in the immediate vicinity of the cement grains); the invalided PCE was due to the decrease of PCE dispersion. In the PCE-SHMP system, "Inner-phosphate (multi-layers) + Outer-PCE (single layer)" structure was formed to make the PCE work more effective, hence enhancing the dispersion. These results were expected to be useful for the design of highly efficient dispersants. dispersion capacity [26][27][28][29][30]. Based on this, the retarder might hinder the adsorption process of PCE and it was referred to as competitive adsorption [31][32][33][34][35], thereby reducing the dispersion. In addition, the thickness of the adsorption layer should also be accepted as a factor influencing the dispersion of PCE [36,37]. In spite of the decline in adsorption amount of PCE in the presence of retarder, as reported in previous study, the adsorption layer was obviously thickened to enhance the dispersion [37]. On the basis of discussion above, the conclusion could be made that the dispersion capacity of the PCE-retarder system should be associated with the retarding effect of retarder, adsorption behavior of PCE, and the thickness of the adsorption layer.Poly-phosphates, such as sodium tripolyphosphate and sodium hexametaphosphate (SHMP), have been widely used to promote the dispersion ability and dispersion retention ability of the superplasticizer system in real engineering practice. However, mono-phosphates, such as trisodium phosphate (TSP) and sodium hydrogen phosphate, cannot play the same roles as poly-phosphate in commercially available PCE products. If the retardation was the main reason for the enhancement, poly-phosphate and mono-phosphate would both have a similar effect on dispersion of PCE system, because both TPS and SHMP could retard the cement hydration [38]. Therefore, the reason why the poly-phosphate could effectively enhance the dispersion, whilst the mono-phosphate failed cannot be simply explained by the retard...

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Fluidizing effects of polymers with various anchoring groups in cement pastes and their sensitivity to environmental temperatures

Cited by 9 publications

References 34 publications

Study on synthesis of temperature-resistant polycarboxylic acid dispersant and its application in oil well cement

Study on synthesis of temperature-resistant polycarboxylic acid dispersant and its application in oil well cement

Polycarboxylate-based superplasticizer with added silica sub-microspheres for use in Portland cement materials

Effect of Sodium Hexametaphosphate and Trisodium Phosphate on Dispersion of Polycarboxylate Superplasticizer

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