Microstructural characterization of fly ash based geopolymer

Bohra, Vinay Kumar Jain; Nerella, Ruben; Madduru, Sri Rama Chand; Rohith, P.

doi:10.1016/j.matpr.2020.03.338

Cited by 15 publications

(18 citation statements)

References 11 publications

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“…According to the results of scanning electron spectroscopy, XRD, and Liew et al [58], it can be judged that the main component of these small white crystals is aluminosilicate [21,59], and they are wrapped by hydration products and a large number of amorphous glassy state materials. This is also consistent with FTIR analysis results [53].…”

Section: Sem Analysissupporting

confidence: 93%

“…Some literature studies use FTIR and XRD to analyze microstructure of geopolymer to support XRD analysis results [52,53]. In future work, we will also use more methods to conduct more microscopic studies on geopolymer.…”

Section: Xrd Analysismentioning

confidence: 99%

“…In this paper, XRD is used to analyze the phase of GBFS, fly ash, and geopolymer paste, and results are shown in Figure 17. Fly ash sample contains a small amount of mullite and quartz [52,53], mainly for its amorphous state. There is no obvious crystal phase in the XRD pattern of GBFS.…”

Section: Xrd Analysismentioning

confidence: 99%

“…It shows that broad hump is formed by geopolymerization. ash sample contains a small amount of mullite and quartz [52,53], mainly for its amorphous state. There is no obvious crystal phase in the XRD pattern of GBFS.…”

Section: Xrd Analysismentioning

confidence: 99%

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Effect of Fine Aggregate Particle Characteristics on Mechanical Properties of Fly Ash-Based Geopolymer Mortar

Gao

et al. 2021

Minerals

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This research aimed to investigate the effect of fine aggregate particles on mechanical properties of fly ash-based geopolymer mortar. In this work, seven kinds of river sand particles were designed based on different fine aggregate characteristics. The fineness modulus was adopted to quantitatively describe the gradation of sands. The fluidity, compressive, flexural, and tensile strengths of geopolymer mortar with different sand gradations were analyzed by laboratory tests. Furthermore, the composition and morphology of fly ash-based geopolymer mortar was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The reasonable gradation range and filling effect of sand were obtained. The results show that fluidity and compressive and flexural strengths of geopolymer mortar both improve with the increase of the fineness modulus, while specific surface area and voidage are opposite. The tensile strength of mortar largely lies on the interface properties between the geopolymer binder and fine aggregates. When the pass rate of the key sieving size 1.18 mm is 75–95%, the pass rate of the key sieving size 0.15 mm is 15–25%, the fineness modulus is 2.2–2.6 and the appropriate filling coefficient of geopolymer paste is around 1.0–1.15, the comprehensive performance of geopolymer mortar is the best. This research paper could provide a basis for the design of geopolymer mortar based on fly ash, and it is of great significance for its popularization and application.

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Section: Sem Analysissupporting

confidence: 93%

Section: Xrd Analysismentioning

confidence: 99%

Section: Xrd Analysismentioning

confidence: 99%

Section: Xrd Analysismentioning

confidence: 99%

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Effect of Fine Aggregate Particle Characteristics on Mechanical Properties of Fly Ash-Based Geopolymer Mortar

Gao

et al. 2021

Minerals

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“…Meanwhile, Na + and Ca 2+ (charge-balance ions) might have been replaced by heavy-metal ions (Zn and Cr), which would indicate chemical bonding in the solidification process [ 6 , 44 ]. The peaks at band 400–549 cm −1 represented Si-O and Al-O bending vibrations [ 49 ]. The peak in the vicinity of 444.12 cm −1 shifted towards the direction of high wavenumbers, indicating that the heavy-metal ions might have been partially fixed in the structure through chemical bonding [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

The Utilization of Alkali-Activated Lead–Zinc Smelting Slag for Chromite Ore Processing Residue Solidification/Stabilization

Fang

Zhang

et al. 2021

IJERPH

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Lead–zinc smelting slag (LZSS) is regarded as a hazardous waste containing heavy metals that poses a significant threat to the environment. LZSS is rich in aluminosilicate, which has the potential to prepare alkali-activated materials and solidify hazardous waste, realizing hazardous waste cotreatment. In this study, the experiment included two parts; i.e., the preparation of alkali-activated LZSS (pure smelting slag) and chromite ore processing residue (COPR) solidification/stabilization. Single-factor and orthogonal experiments were carried out that aimed to explore the effects of various parameters (alkali solid content, water glass modulus, liquid–solid ratio, and initial curing temperature) for alkali-activated LZSS. Additionally, compressive strength and leaching toxicity were the indexes used to evaluate the performance of the solidified bodies containing COPR. As a result, the highest compressive strength of alkali-activated LZSS reached 84.49 MPa, and when 40% COPR was added, the strength decreased to 1.42 MPa. However, the leaching concentrations of Zn and Cr from all the solidified bodies were far below the critical limits (US EPA Method 1311 and China GB5085.3-2007). Heavy-metal ions in LZSS and COPR were immobilized successfully by chemical and physical means, which was detected by analyses including environmental scanning electron microscopy with energy-dispersive spectrometry, Fourier transform infrared spectrometry, and X-ray diffraction.

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Microstructural and mechanical properties of geopolymers based on brick scrap and fly ash

Kugler

Fehn

Sandner

et al. 2022

Int J Ceramic Engine & Sci

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In the present work, the influence of increasing brick scrap additions on the setting behavior and material properties of fly ash-based geopolymers is investigated. The geopolymers produced are tested for their compressive strengths, bulk densities, and thermal conductivities, among other properties. Both the starting materials and the produced geopolymers are also investigated by infrared spectroscopy, X-ray diffraction analysis, and scanning electron microscopy to show the relationship between the solidification behavior and the resulting material properties. The investigations show that brick scrap is very suitable as a matrix material for geopolymer production. Increasing brick scrap additions lead, among other things, to a reduction in bulk density, thermal conductivity and compressive strength.

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Microstructural characterization of fly ash based geopolymer

Cited by 15 publications

References 11 publications

Effect of Fine Aggregate Particle Characteristics on Mechanical Properties of Fly Ash-Based Geopolymer Mortar

Effect of Fine Aggregate Particle Characteristics on Mechanical Properties of Fly Ash-Based Geopolymer Mortar

The Utilization of Alkali-Activated Lead–Zinc Smelting Slag for Chromite Ore Processing Residue Solidification/Stabilization

Microstructural and mechanical properties of geopolymers based on brick scrap and fly ash

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