Influence of activator solution on microstructural and mechanical properties of geopolymer concrete

Bellum, Ramamohana Reddy; Muniraj, Karthikeyan; Madduru, Sri Rama Chand

doi:10.1016/j.mtla.2020.100659

Cited by 31 publications

(8 citation statements)

References 34 publications

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“…The split tensile strength of concrete improved as the GGBS content increased to 80%, beyond which, the tensile strength declined. In contrast to fly ash-based GC, fly ash GGBS-based Geopolymer concrete, combined with an alkaline solution, showed more substantial results after 28 days of ambient curing; this prompted the tensile strength to steadily decline [9]. be found in the work of Verma et al [11] and Abdullah et al [13].…”

Section: Split Tensile Strengthmentioning

confidence: 92%

“…The 20% fly ash and 80% GGBS mixture had a denser structure, comprising a thoroughly reacted matrix with few non-reacted fly ash particles. Non-reacted particles, it has been observed, do not function as 'fillers' in the mixture, but rather, they add to the strength of the mixture as it ages [9]. Figure 14b shows an enlarged image of the reactant on the fly ash surface.…”

Section: Sem and Eds Of Geopolymer Concretementioning

confidence: 99%

“…CO 2 emissions are lower in GC when compared with Ordinary Portland cement (OPC) [4][5][6][7][8]. Fly ash-based GC mixtures were mechanically enhanced, and the C-S-H gel formation was enriched with the addition of 30% GGBS, as it resulted in denser microstructures in the geopolymer concrete [9]. The mechanical properties of geopolymer concrete reached their limit after interacting with specimens that contained 30% fly ash and 30% GGBS in an 8M sodium hydroxide solution [10].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Slag-Based Geopolymer Concrete on the Seismic Behavior of Exterior Beam Column Joints

Maniarasan¹,

Palanisamy²,

Sridhar³

et al. 2023

Sustainability

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In reinforced concrete (RC) constructions, the beam-column junctions are very sensitive to lateral and vertical loads. In the event of unforeseen earthquake and wind loads, this insufficient joint performance can lead to the failure of the entire structure. Cement industries emit a large amount of greenhouse gases during production, thus contributing to global warming. The nature of cement concrete is fragile. Cement output must be reduced in order to ensure environmental sustainability. Geopolymer concrete (GC), which is a green and low-carbon material, can be used in beam-column joints. M30 grade BBGC was developed and employed in the current study. Alkaline liquids are produced when sodium silicate and sodium hydroxide are mixed at room temperature. The alkaline liquid to fly ash ratio was fixed at 0.5, and the concentration of NaOH was fixed at 8 M. The mechanical properties of the Binary Blended Geopolymer concrete (BBGC), containing fly ash and GGBS, at proportions ranging from 0% to 100%, were investigated. This study was further expanded to examine the behavior of two groups of binary blended geopolymer concrete (BBGC) exterior beam-column joints, with cross sections of 230 mm × 120 mm and 170 mm × 120 mm. The column heights and lengths were both 600 mm under reverse cyclic loads in order to simulate earthquake conditions. The failure mechanism, ductility, energy absorption capacity, initial crack load, ultimate load carrying capacity, and structural performance was evaluated. The test findings showed that BBGC with 20% fly ash and 80% GGBS had the highest compressive strength and split tensile strength. When compared with other beam column joints, those containing 20% fly ash and 80% GGBS performed better under cyclic loading. The test findings imply that GGBS essentially enhances the joint performance of BBGC. The microstructural SEM and EDS studies revealed the reasons behind the improvement in strength of the GGBS fly ash-based Geopolymer concrete.

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Section: Split Tensile Strengthmentioning

confidence: 92%

Section: Sem and Eds Of Geopolymer Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Slag-Based Geopolymer Concrete on the Seismic Behavior of Exterior Beam Column Joints

Maniarasan¹,

Palanisamy²,

Sridhar³

et al. 2023

Sustainability

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“…These gel formations were crucial contributors to the overall enhancement of strength in the geopolymer microstructure [3,40]. At atmospheric temperature, the microstructure of specimens was superior to those cured at 70 °C, as it facilitated GGBS dissolution, accelerated the geopolymeric process, and filled voids in the interfacial transition zone (ITZ) and matrix with alumino-silicate gel [41].…”

Section: Sem and Eds Analysis Of Aapmentioning

confidence: 99%

“…These humps facilitates the existence of calcium-based hydration products, including C-S-H, C-A-S-H/N-A-S-H, as well as other compounds such as Quartz (Q) as their end reaction products at the three different types of curing regimes [42,43]. The evidence for higher proportion of calcium in the materials resulted in rapid hardening of the paste, and the alkali-activated GGBS paste set and developed strength quickly [41,44]. The XRD configurations for the samples treated in an ambient atmosphere and in an oven exhibited very little difference form one another.…”

Section: Xrd Evaluation Of Ggbs Based Aapmentioning

confidence: 99%

Effect of varying molarity and curing conditions on the mechanical and microstructural characteristics of alkali activated GGBS binder

2023

Mater. Res. Express

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Geopolymer binder offers a more sustainable choice for producing concrete in comparison to traditional ordinary Portland cement (OPC). The substitution of geopolymer binder for construction practices can decrease carbon dioxide emissions by decreasing OPC usage and repurposing industrial waste materials like ground granulated blast furnace slag (GGBS), fly ash, red mud, silica fume. In order to assess the suitability of GGBS as a binding material, it is essential to conduct conventional tests like consistency, setting times, and compressive strength, which are widely employed in cement testing. This study produced alkali activated paste (AAP) from GGBS and an alkaline activator comprising sodium hydroxide at various molarities from 1M to 8M. This investigation focused on the compressive strength of alkali-activated GGBS-based AAP under varying alkali activation molarities and curing conditions, including ambient, hot air oven, and humidity chamber curing. Additionally, the end reaction products of AAP showing higher compressive strength were examined for scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analysis. The experimental outcomes indicated that GGBS reduced the final setting time of AAP while increasing its compressive strength. Additionally, increasing the quantity of NaOH in the AAP increased its compressive strength. Furthermore, the research findings indicated that the mechanical properties of the alkali-activated GGBS-based material were notably influenced by the chosen curing conditions. Specifically, ambient curing demonstrated superior compressive strength, measuring at 47.06 MPa after 28 days, surpassing the results obtained from hot air oven curing and humidity curing.

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Development of Geopolymer Foam Concrete Incorporating Sugarcane Bagasse Ash and Fly Ash; 100% Recycled and Cement-Less Concrete

et al. 2022

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Influence of activator solution on microstructural and mechanical properties of geopolymer concrete

Cited by 31 publications

References 34 publications

Influence of Slag-Based Geopolymer Concrete on the Seismic Behavior of Exterior Beam Column Joints

Influence of Slag-Based Geopolymer Concrete on the Seismic Behavior of Exterior Beam Column Joints

Effect of varying molarity and curing conditions on the mechanical and microstructural characteristics of alkali activated GGBS binder

Development of Geopolymer Foam Concrete Incorporating Sugarcane Bagasse Ash and Fly Ash; 100% Recycled and Cement-Less Concrete

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