Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

Cai, Jianchen; Jiang, Jinyun; Gao, Xiang; Ding, Meiya

doi:10.3390/ma15072363

Cited by 13 publications

(4 citation statements)

References 36 publications

(34 reference statements)

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“…The weight loss for the fly ash geopolymer specimens that were incorporated in kaolin occurred at approximately 100 • C. When the temperature increased, while the fly ash-based geopolymer-incorporated kaolin showed a complex curve type, a relatively sharp dip in weight was monitored. The examination of both specimens made it obvious that the ideal temperature for curing might range from 80 • C to 100 • C. Cai et al [414] explained that the earliest method of quality deterioration was dehydration. The authors toughened fly ash-based geopolymer by using polyvinyl alcohol (PVA) fibre and powder geopolymer composites.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

A Comprehensive Review on Fly Ash-Based Geopolymer

Luhar

2022

J. Compos. Sci.

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The discovery of an innovative category of inorganic geopolymer composites has generated extensive scientific attention and the kaleidoscopic development of their applications. The escalating concerns over global warming owing to emissions of carbon dioxide (CO2), a primary greenhouse gas, from the ordinary Portland cement industry, may hopefully be mitigated by the development of geopolymer construction composites with a lower carbon footprint. The current manuscript comprehensively reviews the rheological, strength and durability properties of geopolymer composites, along with shedding light on their recent key advancements viz., micro-structures, state-of-the-art applications such as the immobilization of toxic or radioactive wastes, digital geopolymer concrete, 3D-printed fly ash-based geopolymers, hot-pressed and foam geopolymers, etc. They have a crystal-clear role to play in offering a sustainable prospect to the construction industry, as part of the accessible toolkit of building materials—binders, cements, mortars, concretes, etc. Consequently, the present scientometric review manuscript is grist for the mill and aims to contribute as a single key note document assessing exhaustive research findings for establishing the viability of fly ash-based geopolymer composites as the most promising, durable, sustainable, affordable, user and eco-benevolent building materials for the future.

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Section: Thermogravimetric Analysismentioning

confidence: 99%

A Comprehensive Review on Fly Ash-Based Geopolymer

Luhar

2022

J. Compos. Sci.

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“…Natali et al [26] systematically studied the effects of carbon fiber, glass fiber, PVA fiber, and polyvinyl chloride (PVC) fiber on improving the toughness of geopolymers. Cai et al [27] revealed the toughening mechanisms, mechanical properties, freeze-thaw cycle resistance, and thermal decomposition properties of PVA fiber-reinforced geopolymer.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure of Highly Flowable Geopolymer Composites with Low-Content Polyvinyl Alcohol Fiber

Zhang,

Hu,

Duan

et al. 2024

Buildings

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Geopolymer enhances mechanical properties with polyvinyl alcohol (PVA) fibers, but there has been limited research exploring low PVA fiber dosages for mechanical properties in 3D printing or shotcrete. This study experimentally investigated slag and fly ash-based geopolymer mixtures reinforced with 0.1%, 0.15%, and 0.2% PVA fiber by volume as well as a control group without PVA fibers. These mixtures were prepared using fly ash, quartz sand, slag powder, silica fume, and an aqueous sodium silicate solution as the alkali activator, with the addition of PVA fiber to enhance composite toughness. The mechanical properties of the composites, encompassing dog-bone tensile properties, cubic compressive strength, bending and post-bending compressive strength, and prism compressive properties, were evaluated. Significantly, specimens with 0.15% PVA fibers exhibited optimal performance, revealing a notable 28.57% increase in tensile stress, a 36.45% surge in prism compressive strain, and a 47.59% rise in tensile strain compared to fiber-free specimens. Furthermore, environmental scanning electron microscopy observations were employed to scrutinize the microscopic mechanisms of composites incorporating PVA fibers, slag, and fly ash. In comparison to fiber-free specimens, prism compressive specimens with 0.15% PVA fibers demonstrated a 27.17% increase in post-cracking loading capacity, a 44.07% increase in post-cracking ductility, a 50.00% increase in peak strain energy, and a 76.36% increase in strain energy ratio.

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“…It was found that fiber incorporation increased the compressive strength and elastic modulus of ECC and EGC, with PVA fibers performing significantly better than PET and PP fibers. Cai et al [23] varied the form of PVA fiber incorporation and the amount of incorporation to investigate the properties of the geopolymer. The results showed that the incorporation of PVA powder did not enhance the mechanical properties of the geopolymer, and no reaction occurred.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Fibers on Shrinkage Properties and Bonding Properties of Geopolymer Mortar Repair Materials and Analysis of the Mechanism

Sui,

Li,

Zhang

et al. 2023

Coatings

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The geopolymer uses fly ash, slag, and other solid wastes as raw materials and is widely used in building repair, but it is brittle and can be made tougher by incorporating fibers. In this study, polyvinyl alcohol (PVA) fibers, polyoxymethylene (POM) fibers, and polypropylene (PP) fibers were incorporated into the geopolymer mortar repair material, and the geopolymer was tested by changing the amount of fibers incorporation as well as the type. The effect of different fibers on the geopolymer mortar repair material was analyzed by comparing the flexural strength, compressive strength, flexural toughness, shrinkage, and bonding properties with cement mortar of different samples. The geopolymer was analyzed by Diffraction of X-rays (XDR) and Scanning Electron Microscopy (SEM) to further understand the hydration products and microstructure of the geopolymer. The results showed that the incorporation of fibers reduced the flexural strength and increased the compressive strength of the geopolymer mortar repair material; the mechanical properties of the geopolymer mortar repair material decreased with the increase in fiber incorporation, and the best mechanical properties of the geopolymer mortar repair material incorporated with 1.0% PP fibers; the toughening effect of PVA fiber was best when the amount of fiber incorporated was the same; the shrinkage properties of the geopolymer were good and had little effects on the building repair; the bonding properties of repaired specimens repaired with geopolymer mortar repair materials depended on the bonding area of the fracture surface, and the bonding area was enhanced with the increase in fiber incorporation; the XRD pattern showed that the hydration products of the geopolymer were mainly CaCO3 and C–S–H gels.

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Improving the Mechanical Properties of Fly Ash-Based Geopolymer Composites with PVA Fiber and Powder

Cited by 13 publications

References 36 publications

A Comprehensive Review on Fly Ash-Based Geopolymer

A Comprehensive Review on Fly Ash-Based Geopolymer

Mechanical Properties and Microstructure of Highly Flowable Geopolymer Composites with Low-Content Polyvinyl Alcohol Fiber

Effect of Different Fibers on Shrinkage Properties and Bonding Properties of Geopolymer Mortar Repair Materials and Analysis of the Mechanism

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