Strength  and  Durability  Performance  of  Fly Ash Based Geopolymer Concrete Using Nano Silica

Vyas, Sameer; Sameer, Mohammad; Pal, Shilpa; Singh, Neetu

doi:10.29121/ijoest.v4.i2.2020.73

Cited by 17 publications

(4 citation statements)

References 14 publications

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“…Slag particles are dense angular, irregular, and porous in shape, and it helps to strengthen the bond between fly ash and steel slag. Many researchers have proved that these angular shapes enhance the bonding properties [ 9 , 31 , 32 , 33 , 34 ]. Figure 12 a,b displays the SEM image of optimized geopolymer mortar, which has a homogeneous structure with an embedded matrix formation.…”

Section: Resultsmentioning

confidence: 99%

Flexural Performance and Microstructural Studies of Trough-Shaped Geopolymer Ferrocement Panels

Malathy¹,

Mohan²,

Kathirvel

et al. 2022

Materials

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Geopolymer mortar is the best solution as an alternative to cement mortar in civil engineering. This paper deals with the effect of geopolymer mortar on the strength and microstructural properties under ambient curing conditions. In this research, geopolymer mortars were prepared with fly ash and steel slag (in the ratio 1:2.0, 1:2.5 and 1:3.0) as precursors with NaOH and Na2SiO3 as activator solution solutions (in the ratios of 0.5, 0.75 and 1.0) with concentrations of NaOH as 8 M, 10 M, 12 M and 14 M to study the compressive strength behaviour. From the experimental results, it was observed that the geopolymer mortar mix with the ratio of fly ash and steel slag 1:2.5, 12 M NaOH solution and the ratio of NaOH and Na2SiO3 0.5 exhibits the maximum compressive strength results in the range of 55 MPa to 60 MPa. From the optimized results, ferrocement panels of size 1000 mm × 1000 mm × 50 mm were developed to study the flexural behaviour. The experimental results of the flexural strength were compared with the analytical results developed through ABAQUS software. It was observed that the Trough-shaped geopolymer ferrocement panel exhibits 56% higher value in its ultimate strength than the analytical work. In addition to the strength properties, microstructural analysis was carried out in the form of SEM, EDAX and XRD from the tested samples.

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Section: Resultsmentioning

confidence: 99%

Flexural Performance and Microstructural Studies of Trough-Shaped Geopolymer Ferrocement Panels

Malathy¹,

Mohan²,

Kathirvel

et al. 2022

Materials

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show abstract

“…Compressive strength and flexural strength of geopolymer with Nano Silica content [13] Other interesting investigation was led by Sameer Vyas, et. al (2020) [14] amount of nano silica. By weighing fly ash, specimens with nano-silica contents ranging from 0-8% were created.…”

Section: Effect Of Nano Silica In Geopolymer Concretementioning

confidence: 99%

Geopolymer Concrete with Nano Silica: A Review on the Impact of Sodium Hydroxide Solution Molarity

Dhanashire,

Harika,

Sai Goutham

et al. 2024

J. Phys.: Conf. Ser.

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Geopolymer concrete is gaining popularity as a sustainable substitute for conventional cement concrete, primarily attributed to its reduced carbon footprint and enhanced properties. As geopolymer technology advances, ongoing research is directed towards optimizing mix designs, clarifying long-term performance traits, and broadening the material’s range of applications. The practical application of geopolymer concrete faces a limitation in the form of heat activation at different temperatures. Several studies have undertaken the use of nanoparticles to overcome this constraint in optimal proportion. This review provides a thorough examination of the recent research on the integration of nano silica in geopolymer concrete, while also exploring the impact of varying sodium hydroxide solution molarity levels on microstructures and mechanical properties. The findings suggest that the inclusion of an appropriate percentage of nano silica enhances various properties of geopolymer concrete. As the molarity increases it is evident that, properties such as compressive strength, tensile strength, flexural strength, and bond strength exhibit parallel improvements. Upon analyzing various studies, 14M NaOH solution with alkaline-to-binder ratio of 0.4 exhibited superior performance. An accelerated rate of polymerization and the conversion of amorphous compounds into crystalline ones are revealed by applying highly reactive analytical techniques such as XRD, SEM and EDS to geopolymer concrete.

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“…The GPC cubes with 3% Nano silica showed good acid resistance with just a little reduction in compressive strength. The strength during compression and rate of surface erosion reduced as the HCL and H2SO4 concentrations rise; nonetheless, acid resistance is significantly greater than in identical GPC without Nano silica [8]. Because of the increased surface area, adding silicon dioxide to concrete with Geopolymer produces a higher quantity of microscopic particles, reducing workability.…”

Section: Introductionmentioning

confidence: 99%

Study on the Molarity Effect of Sodium Hydroxide on Geopolymer Concrete incorporating Nanosilica

Amarender,

Rayana

2024

J. Phys.: Conf. Ser.

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Geopolymer concrete, an environmentally friendly alternative to typical Portland cement-based concrete, has been gaining popularity due to its less carbon footprint and increased durability. This study investigates the molarity impact of sodium hydroxide (NaOH) on the characteristics of geopolymer concrete, with the inclusion of Nano Silica as a pozzolanic material. The mechanical and flexural properties of Geopolymer concrete (GPC) incorporating Nano Silica at NaOH (sodium hydroxide) molarities of 2M, 4M, 6M, 8M and 10M under ambient curing are evaluated. Flyash, GGBS-ground granulated blast furnace slag, and Silicon Dioxide (Nano Silica) are utilized as binders in the specially blended Geopolymer concrete mix, which is activated by an alkaline solution. The inclusion of Nano-Silica at about 3% of the weight of the binder ingredient is kept constant during our investigation. Nano Silica mostly works as a filler ingredient in concrete. The mechanical properties, fracture energy (GF), and stress intensity ratio or factor (KIC) of geopolymer concrete specimens of notched unreinforced beams (GPCUB) are among the metrics investigated. All of these findings of Geopolymer specimens are compared to those of Ordinary Portland Cement Concrete (PCC) specimens. The primary objective is to determine the impact of different NaOH molarities and Nano Silica inclusion on the ability of geopolymer-based concrete to withstand cracking and modify its behaviour. As the concentration of NaOH in GPC samples increases, so their mechanical characteristics increases. Silica dissolution has the greatest impact in samples treated with a 10M NaOH solution when compared to other molarities and PCC. This implies that incorporating Nano Silica at varied molarities can effectively improve Geopolymer behaviour by increasing its ability to tolerate brittle failure and fracture propagation. The findings of this study have the potential to give useful insights into the most suitable combination of sodium hydroxide molarity and Nano silica concentration for improved geopolymer concrete characteristics. Understanding these interactions becomes essential for the widespread use of geopolymer concrete for construction applications, which contributes to more sustainable and ecologically friendly practices.

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Strength and Durability Performance of Fly Ash Based Geopolymer Concrete Using Nano Silica

Cited by 17 publications

References 14 publications

Flexural Performance and Microstructural Studies of Trough-Shaped Geopolymer Ferrocement Panels

Flexural Performance and Microstructural Studies of Trough-Shaped Geopolymer Ferrocement Panels

Geopolymer Concrete with Nano Silica: A Review on the Impact of Sodium Hydroxide Solution Molarity

Study on the Molarity Effect of Sodium Hydroxide on Geopolymer Concrete incorporating Nanosilica

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