Effectiveness of polycarboxylate as a dispersant of carbon nanotubes in concrete

Vesmawala, Gaurang R.; Vaghela, Ajaysinh R.; Yadav, Kunwar D.; Patil, Yogesh D.

doi:10.1016/j.matpr.2020.01.102

Cited by 27 publications

(24 citation statements)

References 8 publications

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“…Yes, 30 min (6 times with 5 min duration) Vesmawala et al [37] also noted the importance of polycarboxylate to disperse CNTs uniformly within a cement-based composite structure. Besides, polycarboxylate-based superplasticizers have a double-dispersion capacity to disperse cement and CNT particles [38].…”

Section: Pastementioning

confidence: 99%

“…Zhan et al [52] evaluated the performance of cementitious mortar under different loadings of CNTs and reported that the maximum flexural strength and compressive strength were achieved at 0.8 wt% and 1.2 wt% CNT loadings (Figure 12). Similarly, Vesmawala et al [37] investigated the influences of the concentration of CNTs on the mechanical properties of concrete. The study results show that the flexural strength of concrete increased until 0.4 wt% of CNTs and then started decreasing.…”

Section: Mechanical Properties Of Cementitious Composites Incorporatimentioning

confidence: 99%

“…Based on the study results, the author argues that a polycarboxylate superplasticizer not only increases the mechanical properties but also improves the microstructure by distributing the CNTs homogeneously within the hardened cement composite. At Vesmawala et al [37] present the importance of a polycarboxylate superplasticizer as a dispersant of CNTs in the cementitious composite. Based on the study results, the author argues that a polycarboxylate superplasticizer not only increases the mechanical properties but also improves the microstructure by distributing the CNTs homogeneously within the hardened cement composite.…”

Section: Mechanical Properties Of Cementitious Composites Incorporatimentioning

confidence: 99%

“…Relation between compressive and flexural strength of concrete with different concentrations of CNTs[37].…”

mentioning

confidence: 99%

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The Effect of Carbon Nanotubes on the Flowability, Mechanical, Microstructural and Durability Properties of Cementitious Composite: An Overview

2020

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Excellent mechanical properties and chemical stability make carbon nanotubes (CNTs) some of the most promising nanomaterials that can be used in cementitious composites to improve their performance. However, the difficulty of CNTs’ dispersion within the cementitious structure still exists and thus prevents the homogeneous distribution of CNTs. The homogeneous distribution of CNTs within a composite structure plays an essential role that can have a positive effect on the mechanical performance of CNT-cement composites. This paper introduces the methods for the production of CNTs and provides useful information about the influence of CNTs on the flowability, mechanical performance, microstructural changes and hydration of cement composites. The influences of water-cement ratio, used surfactants and various doses of CNTs on the properties of cementitious composites were also studied.

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Section: Pastementioning

confidence: 99%

Section: Mechanical Properties Of Cementitious Composites Incorporatimentioning

confidence: 99%

Section: Mechanical Properties Of Cementitious Composites Incorporatimentioning

confidence: 99%

“…Relation between compressive and flexural strength of concrete with different concentrations of CNTs[37].…”

mentioning

confidence: 99%

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The Effect of Carbon Nanotubes on the Flowability, Mechanical, Microstructural and Durability Properties of Cementitious Composite: An Overview

2020

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“…Moreover, due to its physical properties, small doses of MWCNT can effectively improve the mechanical properties of cementitious composites by slightly in uencing the hydration time and owability [2,3]. The reinforcing e ciency of carbon nanotubes can be in uenced by several parameters such as type of CNTs [4], the concentration of CNT [5], dispersion surfactants [6], treatment of CNTs [3,7], dispersion technique [8], the interaction with cementitious materials and bond strength [9], the watercement ratio [10,11] and geometry of CNTs [12,13]. Zou, Bo, et al [3] and Collins, Frank, et al [ 10]reported in their study that ultrasonication energy and polycarboxylate based superplasticizer can signi cantly in uence the mechanical and microstructural properties of CNT incorporated cementitious composites by optimally dispersing the CNTs within a concrete structure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Carbon Nanotubes on the Properties of Lightweight Concrete Prepared With Expanded Glass and Hydrophobic Silica Aerogel

Adhikary¹,

Rudžionis²,

Tučkutė³

2020

Preprint

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This study aimed to study the effect of carbon nanotubes on the properties of expanded glass and silica aerogel based lightweight aggregate concrete. CNTs were dispersed in the polycarboxylate superplasticizer added water by ultrasonication energy for 3 minutes. Combinations of expanded glass (55%) and hydrophobic silica aerogel particles (45%) were used as lightweight aggregates. Study results show that the incorporation of MWCNTs significantly influences the mechanical and microstructural performance of aerogel based lightweight concrete. Almost 41% improvement in compressive strength was gained by the addition of carbon nanotubes. SEM image of lightweight concrete shows CNTs were almost dispersed homogeneously within the concrete structure. SEM image of the composite also shows the presence of the C-S-H structure surrounding the CNTs, that confirms the cites of nanotubes for higher growth of C-S-H. Besides, agglomeration of CNTs and the presence of Ettringites observed in the transition zone between the silica aerogel and cementitious materials. Moreover, flowability, water absorption, microscopy, XRD, and semi-adiabatic calorimetry results were analyzed in this study.

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Preparation and Utilization of a Comb‐Like Polycarboxylate Dispersant for Organic Pigment

Cao,

Cai,

Huang

et al. 2023

ChemistrySelect

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As a novel form of carboxylate comb‐like copolymers, SAM‐(m)PEG was prepared by polymerizing styrene (S), acrylic (A), and maleic anhydride (M) to obtain a random copolymer labeled SAM. SAM was then esterified using either polyethylene glycol (PEG) or methyl PEG (mPEG), a waterborne polymer dispersant for dispersing and stabilizing C.I. Pigment Yellow 180 (PY 180). The structures of SAM‐(m)PEG and the ground suspension of PY 180 were characterized by Fourier transform infrared (FT‐IR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, scanning electron microscopy (SEM), a nanoparticle size analysis, and viscometry. The effects of different branch chains, synthetic formulas, and grinding conditions on the dispersibility of SAM‐(m)PEG were evaluated. In addition, the optical properties of the pigments were investigated after ultrafine grinding. The adsorption mechanism between the SAM‐(m)PEG dispersants and PY 180 particles is also discussed. SAM‐PEG6002 outperformed the other SAM‐(m)PEG dispersants owing to its excellent dispersion and stability. When used as the dispersant, the average particle size (Z‐average) of PY 180 after grinding was 264.6 nm, and the particle size distribution became narrow (PDI=0.089). Moreover, SAM‐PEG6002 effectively maintained the color performance of the pigment, and the product was successfully applied to the pigment coating. Therefore, SAM‐PEG6002 is an effective waterborne polymer dispersant for organic pigments.

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Effectiveness of polycarboxylate as a dispersant of carbon nanotubes in concrete

Cited by 27 publications

References 8 publications

The Effect of Carbon Nanotubes on the Flowability, Mechanical, Microstructural and Durability Properties of Cementitious Composite: An Overview

The Effect of Carbon Nanotubes on the Flowability, Mechanical, Microstructural and Durability Properties of Cementitious Composite: An Overview

Effects of Carbon Nanotubes on the Properties of Lightweight Concrete Prepared With Expanded Glass and Hydrophobic Silica Aerogel

Preparation and Utilization of a Comb‐Like Polycarboxylate Dispersant for Organic Pigment

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