Influence of the PVA fibers and SiO2 NPs on the structural properties of fly ash based sustainable geopolymer

Xu, Sheng; Malik, Muhammad Akbar; Zhang, Qi; Huang, Bo-Tao; Li, Qinghua; Sarkar, Manas

doi:10.1016/j.conbuildmat.2017.12.227

Cited by 99 publications

(39 citation statements)

References 30 publications

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“…It was noticed that the PVA fibers reinforced geopolymer specimens showed ductile failure after a maximum load by retaining their original shapes. Similar trends were also observed in previous work [25].…”

Section: Compressive Strengthsupporting

confidence: 92%

“…Nanosilica increased the amount of reactive silica in the geopolymeric system, resulting the formation of silicon-rich gel, which has compacted and improved mechanical properties. The alteration of large pores in geopolymeric structures, comprising the nanosilica and PVA fibers, was also observed, and it could be the reason behind the enhanced bond strength between the deformed steel bar and the matrix in the specimens [25]. The bond stress-slip curves of all the geopolymer pull out specimens are presented in Figure 12B.…”

Section: Pull Out Testmentioning

confidence: 87%

“…In addition, due to their texture and surface reaction with geopolymer products and an alkali activator solution, heat was produced, which increased the internal curing temperature. The rise in temperature accelerated the geopolymerization process, which in turns strengthened the geopolymeric gel enhanced the mechanical strength [25,33]. It was observed that an increase of fibers improved the compressive strength of specimens.…”

Section: Compressive Strengthmentioning

confidence: 97%

“…Based on the results of our previous study, the geopolymer composites, with mix proportions, were established [25]. An alkaline activator was prepared by mixing 10 M NaOH with liquid Na 2 SiO 3 in a weight ratio (10 M NaOH/Na 2 SiO 3 ) of 2.…”

Section: Specimens Preparationmentioning

confidence: 99%

“…Incorporation of poly vinyl alcohol (PVA) fibers enhanced the compressive and splitting strength of specimens by 9.95% and 61.69%, respectively, as compared to non-fibrous specimens [24]. In our previous study [25], fly ash-based geopolymers, reinforced with poly vinyl alcohol (PVA) fibers and SiO 2 nanoparticles, were developed with enhanced mechanical strength and durability. The multiple cracking behaviors appeared in the developed geopolymer binder when subjected to flexural and compressive loading and, hence, ductile failure was observed.…”

Section: Introductionmentioning

confidence: 99%

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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: 92%

Section: Pull Out Testmentioning

confidence: 87%

Section: Compressive Strengthmentioning

confidence: 97%

Section: Specimens Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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