Mix design and flexural toughness of PVA fiber reinforced fly ash-geopolymer composites

Xu, Fang; Deng, Xin; Peng, Chao; Zhu, Jing; Chen, Jianping

doi:10.1016/j.conbuildmat.2017.05.172

Cited by 121 publications

(48 citation statements)

References 34 publications

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“…Previous studies also reported the similar findings [34,35]. Xu et al [36] found that, as the content of PVA fibers increased, the compressive and flexural strengths were also increased. They concluded that the compressive strength of the specimen, with larger amounts of PVA fibers (2% vol.…”

Section: Compressive Strengthsupporting

confidence: 69%

Effect of PVA/SiO2 NPs Additive on the Structural, Durability, and Fire Resistance Properties of Geopolymers

Malik

Sarkar

et al. 2019

Applied Sciences

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This exertion introduces polyvinyl alcohol fiber/silica nanoparticles (poly vinyl alcohol (PVA)/SiO2 NPs) in the fly ash-based geopolymer at ambient curing temperature. The present study aims at investigating the structural properties (compressive, bond strength, fracture parameters (fracture toughness (KIc), crack mouth opening displacement (CMOD)), cyclic compression), durability (freeze-thaw), and fire resistivity of the newly developed PVA/SiO2 NPs mediated geopolymer. The outcomes suggest that geopolymers incorporated with 5% PVA fibers showed improved structural properties and durability as compared to other specimens. Investigation on the fire resistivity of the geopolymers exposed to different heating temperatures (400 °C, 600 °C, 800 °C), showed that geopolymers with PVA/SiO2 NPs significantly prevented the explosive concrete spalling. Microstructural studies confirmed that PVA fibers in the geopolymeric matrixes were well distributed and developed a fiber-bridging texture with improved performance. Addition of the nano-silica particles accelerated the heat evolution during the hydration process and the geopolymeric reaction (formation of sodium aluminosilicate N-A-S-H gel) at ambient curing environment.

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Section: Compressive Strengthsupporting

confidence: 69%

Effect of PVA/SiO2 NPs Additive on the Structural, Durability, and Fire Resistance Properties of Geopolymers

Malik

Sarkar

et al. 2019

Applied Sciences

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“…Low-calcium fly ash (FFA), as one of most commonly used raw materials and most available solid wastes for geopolymer preparation, mainly consists of amorphous spherical beads with aluminosilicate compositions [ 2 , 13 , 14 , 15 ]. The amorphous geopolymer can be manufactured with FFA and basic alkaline solution with Na + or K + cations, such as NaOH, KOH, Na 2 SiO 3 or other mixed solutions by geopolymerization process [ 13 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Resistance of Soda Residue–Fly Ash Based Geopolymer Mortar to Acid and Sulfate Environments

et al. 2021

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The early mechanical performances of low-calcium fly ash (FFA)-based geopolymer (FFA–GEO) mortar can be enhanced by soda residue (SR). However, the resistance of SR–FFA–GEO mortar to acid or sulfate environments is unclear, owing to the various inorganic calcium salts in SR. The aim of this study was to investigate the long-term mechanical strengths of up to 360 d and evaluate the resistance of SR–FFA–GEO mortar to 5% HCl and 5% Na2SO4 environments through the losses in compressive strength and mass. Scanning Electron Microscopy (SEM), Energy-Dispersive Spectroscopy (EDS) and Fourier Transform Infrared Spectrometer (FTIR) experiments were conducted for the SR–FFA–GEO mortars, both before and after chemical attack, to clarify the attack mechanism. The results show that the resistances of the SR–FFA–GEO mortar with 20% SR (namely M10) to 5% HCl and 5% Na2SO4 environments are superior to those of cement mortar. The environmental HCl reacts with the calcites in SR to produce CaCl2, CO2 and H2O to form more pores under HCl attack, and the environmental Na+ cations from Na2SO4 go into Si-O-Al network structure, to further enhance the strength of mortar under Na2SO4 attack. These results provide the experimental basis for the durability optimization of SR–FFA–GEO mortars.

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“…Geopolymers have been a focus of research since the 1970s, and are associated with numerous international patents as well as a number of commercial engineering projects. They have been proven to possess excellent mechanical and thermal properties (Juenger et al, 2011;Provis and Van Deventer, 2009), demonstrating their potential use as a replacement of Portland cement in low-risk and niche applications (Mehta and Siddique, 2018;Wang et al, 2019a;Wang et al, 2019b;Wang et al, 2018;Xu et al, 2017;Xu et al, 2018). The chemical process of geopolymerization resembles the formation of zeolites due to the production of gel phases, and both belong to the same aluminosilicate group (Papa et al, 2018;Rao and Rao, 2015).…”

Section: Introductionmentioning

confidence: 99%

Development of precast geopolymer concrete via oven and microwave radiation curing with an environmental assessment

Kastiukas

Ruan

Liang

et al. 2020

Journal of Cleaner Production

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Mix design and flexural toughness of PVA fiber reinforced fly ash-geopolymer composites

Cited by 121 publications

References 34 publications

Effect of PVA/SiO2 NPs Additive on the Structural, Durability, and Fire Resistance Properties of Geopolymers

Effect of PVA/SiO2 NPs Additive on the Structural, Durability, and Fire Resistance Properties of Geopolymers

Resistance of Soda Residue–Fly Ash Based Geopolymer Mortar to Acid and Sulfate Environments

Development of precast geopolymer concrete via oven and microwave radiation curing with an environmental assessment

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