Preparation, application and water reducing mechanism of a novel fluorescent superplasticizer with improved flow retaining ability and clay tolerance

Qu, Haojie; Fu, Changhui; Yang, Weiben; Yang, Zhen; Zhang, Limin

doi:10.1080/01932691.2018.1462197

Cited by 15 publications

(6 citation statements)

References 57 publications

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“…However, because the PEG side chain contained a large number of units, the height of other peaks was very small: the peak at 1.4–2.0 ppm was H3, the peak at 2.2–2.5 ppm was H1, and the peak at 2.6–2.7 ppm was H2. Compared with CO‐PCE, there were three peaks at 3.8–3.9 ppm only in AC‐PCE, which were attributed to β ‐CD 26–28 . Based on GPC, FTIR, and 1 H NMR results, the conclusions was obtained that

β

‐CD was successfully grafted onto AC‐PCE.…”

Section: Resultsmentioning

confidence: 92%

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Synthesis of polycarboxylate superplasticizer modified by β‐cyclodextrin for possessing clay tolerance

Jin

et al. 2021

J of Applied Polymer Sci

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Polycarboxylate superplasticizer (PCE) is widely used in concrete, but the clay content in the aggregate is increasing at present, which seriously weakens the dispersing function of PCE. Therefore, in order to lower the sensitivity of PCE to the clay, β‐cyclodextrin (β‐CD) was used for synthesizing anti‐clay polycarboxylate superplasticizers (AC‐PCE). Firstly, the clay tolerance property of AC‐PCE was explored by the fluidity and rheological test; then, the PCE was mixed with montmorillonite (MMT), and interaction mechanism was studied. The results showed that compared with the conventional polycarboxylate superplasticizer (CO‐PCE), an increase of 19.5% and 14.9% was observed in the fluidity of cement paste and mortar for AC‐PCE, indicating that the sensitivity of AC‐PCE to the clay was lower than that of CO‐PCE. Both CO‐PCE and AC‐PCE were adsorpted on MMT. XRD results showed that intercalation adsorption had occurred for both CO‐PCE and AC‐PCE. N2 adsorption results showed that although AC‐PCE was also inserted into the interlayer of MMT, its adsorption amount was lower than that of CO‐PCE due to steric hindrance from β‐CD, which increased the sorption level of the AC‐PCE on the cement clinkers particles. Therefore, the clay tolerance of PCE was enhanced significantly by β‐CD.

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β

‐CD was successfully grafted onto AC‐PCE.…”

Section: Resultsmentioning

confidence: 92%

“…Compared with CO-PCE, there were three peaks at 3.8-3.9 ppm only in AC-PCE, which were attributed to β-CD. [26][27][28] Based on GPC, FTIR, and 1 H NMR results, the conclusions was obtained that β-CD was successfully grafted onto AC-PCE.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of polycarboxylate superplasticizer modified by β‐cyclodextrin for possessing clay tolerance

Jin

et al. 2021

J of Applied Polymer Sci

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“…Our previous studies also found that there is competitive adsorption between clay and hydration products when the admixture participates in the hydration reaction, establishing the following adsorption sequence for different minerals: montmorillonite > illite > calcite > orthoclase > quartz [12]. The effectiveness of various PCEs in dispersion hinges largely on their adsorption capacity on cement particles [13,14]. Consequently, variations in side-chain densities and main-chain lengths can impact the competitive adsorption of PCEs on both clay and cement particles.…”

Section: Introductionmentioning

confidence: 91%

“…The effectiveness of various PCEs in dispersion hinges largely on their adsorption capacity on cement particles [ 13 , 14 ]. Consequently, variations in side-chain densities and main-chain lengths can impact the competitive adsorption of PCEs on both clay and cement particles.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Side-Chain Length in Polycarboxylic Superplasticizer on the Competition Adsorption in the Presence of Montmorillonite: A Density Functional Theory Study

He,

Huang,

Gao

et al. 2024

Molecules

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Polycarboxylic superplasticizers (PCEs) exhibit numerous advantages as concrete additives, effectively improving the stability and strength of concrete. However, competitive adsorption of PCEs occurs in the presence of clay, which may affect the cement dispersion and water-reducing performance. Extensive research has been conducted on the physical and mechanical properties of PCEs; however, the effect of the diverse structures of PCEs on the competitive adsorption on clay and cement hydration products has been rarely studied. This study employs Ca-montmorillonite (CaMMT) as a clay representative, by constructing adsorption models of PCEs on CaMMT and cement hydration products. A comparison of the adsorption energies considering different side-chain lengths of PCEs is included. Typically, the adsorption energy on CaMMT is lower than that on hydration products, leading PCEs to preferentially adsorb on the clay, thereby reducing its effective dosage in the cement particles. The challenge of PCE adsorption on CaMMT increases with the polymerization degree, and methylallyl polyoxyethylene ether (HPEG) exhibits lower adsorption energies on CaMMT. The density of states (DOS) analysis indicated the highest peak values of allyl polyethylene ether (APEG) as well as the peak area at n (polymerization degree) = 1. The total number of transferred electrons for APEG was 0.648, surpassing those of other PCEs. The interaction mechanism of PCEs with clay and hydration products is further elucidated through electronic gain/loss analysis, also providing a basis for the theoretical analysis on how to reduce the adsorption of PCEs on clay and the structural design of mud-resistant PCEs.

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“…In addition, due to the cost and plasticization issues, this problem cannot be solved simply by increasing the dose of PCE. Current efforts to address this have focused on two aspects: (1) modifying the molecular structure of PCE to achieve intercalation adsorption reduction between PCE and clay; (2) introducing an additive that can specifically adsorb clay and inhibit the adsorption of PCE with clay is known as the SA [12]. Plank et al report that the utilization of polyethylene glycol (PEG) can serve as an effective surfactant when employing highly grafted PCE.…”

Section: Introductionmentioning

confidence: 99%

Maltitol-Derived Sacrificial Agent for Enhancing the Compatibility between PCE and Cement Paste

Wang,

Zhao,

Wang

et al. 2023

Materials

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At present, it is known that when there is clay in concrete, polycarboxylates (PCE) will preferably adsorb in the clay, so that PCE cannot be fully combined with cement particles, which reduces the workability of the cement slurry. In this paper, a new type of maltitol–ammonium salt cationic (KN-lm) sacrificial agent (SA) has been successfully developed via a simple method, which makes PCE easier to bond with cement particles in the cement slurry containing clay. The effect of KN-lm on the fluidity of clay-containing cement paste is studied, and the experimental results show that KN-lm, as an efficient SA of cement slurry, makes PCE more compatible with clay-containing cement slurry, and increases the initial fluidity of cement slurry by about 19%. Further investigations of TOC, XRD, and zeta potential measurements reveal that a KN-lm ion is only preferably adsorbed into clay compared to PCE through electrostatic adsorption but without having any crystal structure change, thus resulting in good dispersion of cement particles. The addition of KN-lm plays an important role in hindering the hydration expansion of the clay by preferential electrostatic adsorption, which means PCE cannot easily insert into the interlayer of the clay.

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Preparation, application and water reducing mechanism of a novel fluorescent superplasticizer with improved flow retaining ability and clay tolerance

Cited by 15 publications

References 57 publications

Synthesis of polycarboxylate superplasticizer modified by β‐cyclodextrin for possessing clay tolerance

Synthesis of polycarboxylate superplasticizer modified by β‐cyclodextrin for possessing clay tolerance

Effect of the Side-Chain Length in Polycarboxylic Superplasticizer on the Competition Adsorption in the Presence of Montmorillonite: A Density Functional Theory Study

Maltitol-Derived Sacrificial Agent for Enhancing the Compatibility between PCE and Cement Paste

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