Macro-defect free cements: a future oriented polymer composite materials for construction industries

Tomar, Priyanka; Lakhani, Rajni; Chhibber, Vijay K.; Kumar, Rajesh

doi:10.1080/09276440.2018.1439637

Cited by 15 publications

(8 citation statements)

References 50 publications

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“…Water soluble polymers such as PVA, vinyl acetate copolymer, PAM and cellulose can fill the interspaces between unreacted cement particles and interact with the hydration products of cement to form polymer modified cement with improved microstructure and mechanical properties. 38 The mechanical properties of polymer modified cement are improved remarkably, including high bending strength, tensile strength and elastic modulus. 39 In order to overcome the main conflict between mechanical performance and electrical properties of structural electrolytes and supercapacitors, PVA based gel polymer electrolyte and cement are combined to prepare cement/PVA-KOH composite as structural electrolyte in this paper.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional structural supercapacitor based on cement/PVA-KOH composite and graphene

Zhang

2020

Journal of Composite Materials

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Multifunctional structural supercapacitor based on the structural electrolyte of cement/PVA-KOH composite and the structural electrode of highly electrically graphene was fabricated with sandwich structure. A bicontinuous microstructure composed of PVA and hardened cement paste is formed. Flexible PVA in cement/PVA-KOH composite increases ions’ accessibility with graphene at the interface between the structural electrode and the structural electrolyte. The addition of KOH changes the structure of PVA from crystalline state to amorphous state. So PVA can complex and discomplex with KOH to realize ionic conduction. The effects of PVA’s content, polymerization degree and hydrolysis degree on the electrochemical properties and mechanical properties were analyzed. The composite’s ionic conductivity increases with PVA’s content and hydrolysis degree, and it shows a tendency of decreasing after increasing with PVA’s polymerization degree. Similarly, the specific capacitance of the structural supercapacitor also increases with PVA’s content and hydrolysis degree, but decreases with PVA’s polymerization degree. Compared with the polymerization degree, the hydrolysis degree plays a more prominent part in affecting the specific capacitance of the structural supercapacitors. For mechanical properties of cement/PVA-KOH composite, the compressive strength is mostly improved by PVA at a content of 2%. It decreases with PVA’s polymerization degree and increases with PVA’s hydrolysis degree. The conflict between the power density and energy density in structural energy storage is eased remarkably and the electrical and mechanical properties can be improved simultaneously. The two chief obstacles are tackled in the PVA1799-based structural supercapacitor.

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Section: Introductionmentioning

confidence: 99%

Multifunctional structural supercapacitor based on cement/PVA-KOH composite and graphene

Zhang

2020

Journal of Composite Materials

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“…The high shear stress produced by the open mill can break the C-C bond in the polymer chain into two active macromolecular functional groups with equal molecular weight. The macromolecular functional groups can be cross linked with CAC hydration products to form metal carboxylate [4][5][6][7]. The addition of silica fume can effectively improve the strength of ordinary cement-based materials, but it had an adverse effect on MDF cements.…”

Section: Introductionmentioning

confidence: 99%

The effect of carbon nanotubes on the mechanical and damping properties of macro-defect-free cements

Zhang

et al. 2020

Science and Engineering of Composite Materials

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The effect of CNTs on the mechanical and damping properties of macro-defect-free (MDF) cements was studied, and polyvinyl alcohol (PVA) fibers were also studied as a contrast. It was found that the compressive strength of MDF cements was not significantly affected by the two types of fibers. The CNTs enhanced the flexural strength of MDF, while PVA fibers made negative contribution. The strengthening mechanism of flexural strength of MDF cements by CNTs can be summarized as fiber bridging, crack deflection and fiber slippage. For the damping properties, the proper contents of CNTs and PVA fibers improved the loss factor significantly. The interface transition zone (ITZ) between the PVA fibers and matrix was large, which was favorable for fiber slippage. The damping property of MDF cements with CNTs was mainly due to the slippage between the inner tubes of the CNTs rather than the slippage between the CNTs and matrix.

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“…Thus, this is an ideal opportunity to utilize other substitution materials rather than normal material assets to enhance new remarkable building materials, which won't just build up the limit of basic conduct in spite of the fact that strength is decreased. Therefore, the redesign spending plan can likewise be diminished impressively [2]. The prerequisites to get high quality have been created using full scale deformity free bonds (MDFCs) or concrete polymer composite which were first created and protected by Birchall and his associates in the mid 1980s [2].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the redesign spending plan can likewise be diminished impressively [2]. The prerequisites to get high quality have been created using full scale deformity free bonds (MDFCs) or concrete polymer composite which were first created and protected by Birchall and his associates in the mid 1980s [2]. In such a sort of composite material, a cooperation among bond and polymer makes a microstructure with unmistakable highlights [3].…”

Section: Introductionmentioning

confidence: 99%

“…As quality is an essential interest of each development to make more strong framework. In this way, these materials have gotten huge consideration because of their high flexural and elasticity properties [2]. It is trusted that a portion of the water-solvent polymers collaborate artificially with the hydration results of Portland bond, and the others simply make a film around concrete grains [9] [10].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Optimal Percentage from Polyvinyl Alcohol on Flexural Strength of Cement Mortar Composite

Abbas¹,

Korkess²,

Jasim³

2018

IJET

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Polyvinyl alcohol solution(PVA) proveded potential enhancement of the properties of cement mortar composite. This work investigated the effect of (w/c) and polymer-cement ratios (p/c) on the flexural strength of type I Portland cement mortar. A sand-cement ratio (s/c) of 1.25 and 0.5 by mass was used, and PVA powder was dispersed in water at (0.7%, 1%, 2%, and 3%) by weight of cement. The p/c solution was adjusted at five different values of 0.008, 0.012, 0.016, 0.020 and 30% covering relatively low and high values. Two types of curing were used; wet and dry curing. The study results demonstrated that flexural strength and significant water absorption properties of Portland cement mortar, as well as workability can be basically enhanced by the addition of PVA. Composite was prepared with optimum (p/c) 1.6% at concentration of 1% by mass under dry curing. The highest flexural strength was above twice the flexural strength of unmodified mortar. Also modified mortar samples illustrated that increasing of (p/c) causes reducing water absorption due to the packing effect caused by PVA, while mortar prepared at 0.1 and 0.3 w/c and (p/c) respectively, exhibited an increase in flexural strength which was more than the strength of unmodified mortar.

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Macro-defect free cements: a future oriented polymer composite materials for construction industries

Cited by 15 publications

References 50 publications

Multifunctional structural supercapacitor based on cement/PVA-KOH composite and graphene

Multifunctional structural supercapacitor based on cement/PVA-KOH composite and graphene

The effect of carbon nanotubes on the mechanical and damping properties of macro-defect-free cements

Investigation of the Optimal Percentage from Polyvinyl Alcohol on Flexural Strength of Cement Mortar Composite

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