Effect of Carbon Nanotubes on the Mechanical Fracture Properties of Fly Ash Geopolymer

Rovnanı́k, Pavel; Šimonová, Hana; Topolář, Libor; Schmid, Pavel; Keršner, Zbyněk

doi:10.1016/j.proeng.2016.07.360

Cited by 50 publications

(11 citation statements)

References 9 publications

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“…The addition of MWCNTs increase the compressive strength and elastic modulus of geopolymer. The fracture toughness and fracture energy decreased with very small additions of MWCNTs [8].…”

Section: Geopolymer Pastementioning

confidence: 97%

“…Today, generally fly ash is used in cement plants as an ingredient mix concrete. In addition, the actual fly ash has a variety of uses that are very diverse, namely: 1) the application of concrete for roads and dams, 2) stacking land formerly used for mining, 3) recovery of magnetite and carbon, 4) raw materials of ceramic, glass, stone brick and refractory, 5) abrasive materials, 6) filler asphalt, plastic, and paper, 7) substitute and cement raw materials, 8) Source: ASTM C 618 -03 [1]…”

Section: Fly Ashmentioning

confidence: 99%

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Characterization and compressive strength of fly ash based-geopolymer paste

et al. 2018

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Abstract. Fly ash is a by-product obtained from coal combustion process. Some of the utilization of fly ash is to produce geopolymer products which have high compressive strength, fire, chemical resistance. This paper proposes fly ash from unit 1-7 Suralaya Power Plant Indonesia. The aims of this study are to obtain characterization of fly ash and mechanical properties of geopolymer paste based on variations of the alkali activator ratio. The method was based on previous research and laboratory investigation. XRF and compressive strength were analysed in this study. Alkali activator was obtained from NaOH and Na2SiO3 mixture. The ratio of Na2SiO3 to NaOH was in the range of 0.5-2.5. Geopolymer paste was casted in acrylic cylinders with a diameter of 2 cm and a height of 4 cm. The curing was conducted at room temperature until the day for the compressive strength test at 28 days. The result showed that the fly ash is classified as F class. Increasing the alkali activator ratio influenced the strength. The best composition of geopolymer paste is made with NaOH 8M, and the mass ratio of Na2SiO3 to NaOH is 2.5. This composition produced compressive strength of 98.6 MPa.

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“…The addition of MWCNTs increase the compressive strength and elastic modulus of geopolymer. The fracture toughness and fracture energy decreased with very small additions of MWCNTs [8].…”

Section: Geopolymer Pastementioning

confidence: 97%

Section: Fly Ashmentioning

confidence: 99%

Characterization and compressive strength of fly ash based-geopolymer paste

et al. 2018

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“…In addition, fly ash is also used to make epoxy composites with insulating properties, studied by Pham i Huong [11]. Fly ash is also used to make geopolymer; however, to improve some mechanical properties such as tensile strength and bending strength, some scientists have added nanoadditives such as MWCNTs to enhance some of the degraded durability in the desired green concrete production [12][13][14]. is is the study on flame retardant properties and mechanical properties of epoxy nanocomposites materials in the presence of fly ash additives and reinforced by MWCNTs.…”

Section: Introductionmentioning

confidence: 99%

Study on Synergies of Fly Ash with Multiwall Carbon Nanotubes in Manufacturing Fire Retardant Epoxy Nanocomposite

Nguyen

2020

Journal of Chemistry

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In this study, fly ash (FA) and multiwalled carbon nanotubes (MWCNTs) were used to make environmentally friendly nanocomposites, which have high fire retardant properties and high mechanical properties. Industrial waste such as fly ash has become a major concern during the treatment of environmental pollution. MWCNTs were used in this experiment to enhance the flame retardant properties and mechanical properties of materials with fly ash additives. MWCNTs content (0.03, 0.04, and 0.05 wt.%) and fly ash content (30, 40, and 50 wt.%) were studied for three different levels. The flame retardancy of the material is significantly improved by the addition of fly ash/MWCNTs at different rates, especially at 0.04 wt. % MWCNTs and 40 wt. % fly ash with LOI at 26.8%. Regarding mechanical properties, tensile strength increases as fly ash/MWCNTs increase, up to a critical point. On the other hand, the compressive strength of composite increases continuously as fly ash/MWCNTs increase. Scanning electron microscopy (SEM) was used to observe the morphology of fly ash and MWCNTs as well as its distribution in the matrix. This will help analyze the influence of the effectiveness of the combination of fly ash and MWCNTs to the flame retardancy and mechanical properties of fly ash/MWCNTs/epoxy nanocomposites.

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“…Mackenzie and Bolton 1 showed the influence of the alkali activator on the potential of single‐walled carbon nanotubes to yield an increase in tensile strength. Rovnanik et al 2 showed that multiwalled carbon nanotubes contribute to an increase in elastic modulus, compressive strength, and fracture toughness in fly ash geopolymer materials. Saafi et al 3 showed that multiwall carbon nanotubes enhance the elastic, strength, and fracture behavior of fly ash geopolymer by activating crack‐bridging mechanisms.…”

Section: Introductionmentioning

confidence: 99%