Effect of Morphologically Controlled Hematite Nanoparticles on the Properties of Fly Ash Blended Cement

Kongsat, Pantharee; Sinthupinyo, Sakprayut; O’Rear, Edgar A.; Pongprayoon, Thirawudh

doi:10.3390/nano11041003

Cited by 4 publications

(2 citation statements)

References 48 publications

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“…Zhang et al [59] and Bhenia et al [60] also reported similar results with SiO 2 additives. Additionally, Kongsat et al [61] obtained similar results with Fe 2 O 3 doping. It is well known that the pozzolanic activity of SiO 2 accelerates hydration reactions and leads to a decrease in setting times [62,63].…”

Section: Mortar Strength Setting Times and Durability Studiesmentioning

confidence: 64%

Investigation of the use of cobalt and nickel based nanoalloys as cement mortar additives

Karaduman,

Pişkin

2024

Mater. Res. Express

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The usage potential of chemical and green synthesized cobalt (Co) and nickel (Ni) nanoalloys (CoNiNAs) as mortar additives at different ratios was evaluated. The CoCl2 and NiCl2 metallic salt solutions were mixed in volume ratios of 1-1, 1-2, and 2-1 and reduced with NaBH4 and St. John's Wort aqueous extract, respectively. The obtained Co-Ni based complex nanoalloys were analyzed by Ultraviolet-Visible Spectroscopy (UV-Vis), X-Ray Diffraction Analysis (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and Dynamic Light Scattering Particle Size Analyzer (DLS). The effect of CoNiNAs was investigated based on the amount used in mortar, flexural and compressive strengths of mortar, setting time retarder properties, and carbonation depth measurements of mortars and nanoalloy form based on whether they were solid (chemical synthesise) or liquid (green synthesise). The results revealed that the chemical synthesized CoNiNAs were amorphous metal-metal-oxide complexes with small spherical particles and a low dispersity index, whereas the green synthesized complexes had a more crystalline structure and smaller sizes. The mortar properties were affected by Co and Ni synthesis ratios and addition amounts. The incorporation of CoNiNAs led to an increase in the setting times of mortar. Furthermore, the ‘CN’ 2% sample exhibited the highest compression (49.10±1.19 MPa) and flexural (8.19±0.20 MPa) strengths. In addition, the ‘CN2’ 1% sample exhibited the lowest carbonation depth (2.95±0.35 mm) compared to other samples. Overall, mortars with CoNiNAs additives may be used in high temperature environments, and long shipment times require remote locations due to setting time retarder effect without losing necessary physical properties.

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Section: Mortar Strength Setting Times and Durability Studiesmentioning

confidence: 64%

Investigation of the use of cobalt and nickel based nanoalloys as cement mortar additives

Karaduman,

Pişkin

2024

Mater. Res. Express

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“…By acting as a reinforcing load, these particles improve compressive strength. 35 This may be an indication that the iron(III) from hematite is unlikely to be part of the geopolymerisation process. Zhu et al reported that the presence of iron(III) binds mainly to hydroxyl groups, which increases the number of nucleation sites and thus the geopolymerisation process, and hence the compressive strength.…”

Section: Compressive Strengthsmentioning

confidence: 99%

Microstructure and Compressive Strength of Geopolymer Materials Based on Metakaolin with Hematite and Magnetite Gels as Additives

Dimace Lionel Vofo Ngnintedem,

Jean Mermoz Siéwé,

Hervé Kouamo Tchakouté

et al. 2024

SCE

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The purpose of this work is to increase the compressive strength and improve the microstructure of geopolymer materials by adding hematite and magnetite gels, as well as their powders, cured at 80 °C. Hematite and magnetite are dissolved in 10 M sodium hydroxide. Dried gels of hematite and magnetite were then ground to produce powders of dissolved hematite and magnetite. For the production of various geopolymer materials, the metakaolin was replaced by 0 and 10 wt. % of each additive and then mixed with the hardener containing the SiO2/Na2O molar ratio set at 1.6. The results show that the reference geopolymer has a compressive strength of 51.11 MPa. These values are 50.99 and 47.59 MPa for the geopolymer materials with 10 wt. % of dissolved magnetite gel and the powder of dissolved magnetite cured at 80 °C, respectively. They are 59.52 and 63.23 MPa for those prepared using 10 wt. % of dissolved hematite gel and for the powder of dissolved hematite cured at 80 °C, respectively. Si, Al, Fe, Na and Ti form a homogeneous phase in the geopolymer structures with the exception of a few magnetite particles agglomerated in the geopolymer materials. Compressive strength was found to be improved by the use of hematite gel and dissolved hematite powder cured at 80 °C as additives. A slight reduction in the compressive strength was observed when the dissolved magnetite gel and the powder of the dissolved magnetite cured at 80 °C were used as additives.

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Investigation on Binary, Ternary, and Quaternary Blended Cement Mortar Integrated with Mineral Additives

Chahar,

Pal

2024

Iran J Sci Technol Trans Civ Eng

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Effect of Morphologically Controlled Hematite Nanoparticles on the Properties of Fly Ash Blended Cement

Cited by 4 publications

References 48 publications

Investigation of the use of cobalt and nickel based nanoalloys as cement mortar additives

Investigation of the use of cobalt and nickel based nanoalloys as cement mortar additives

Microstructure and Compressive Strength of Geopolymer Materials Based on Metakaolin with Hematite and Magnetite Gels as Additives

Investigation on Binary, Ternary, and Quaternary Blended Cement Mortar Integrated with Mineral Additives

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