Microstructure and engineering properties of Fe2O3(FeO)-Al2O3-SiO2 based geopolymer composites

Kaze, Cyriaque Rodrigue; Moungam, Lynn Myllyam Beleuk à; Cannio, Maria; Rosa, Roberto; Kamseu, Elie; Melo, Uphie Chinje; Leonelli, Cristina

doi:10.1016/j.jclepro.2018.07.171

Cited by 101 publications

(42 citation statements)

References 24 publications

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“…This is due to a typical formation of a new gel phase known as ferrosialate gel as a result of the incorporation of Fe +2 with the activator solution and other ions from the geopolymeric system via a similar chemical process as the Si 4+ , Al 3+, and Ca 2+ . This was stated by Cannio et al (2018) [28] where the ferrosialate has been identified in a geopolymer mix.…”

Section: Compressive Strength Of Fa-based Geopolymer Repair Materialsmentioning

confidence: 61%

“…Similarly, Cannio et al (2018) [28] suggested that the formation of fayalite can occur through a chemical reaction of hydrated ferric oxyhydroxide with silica as shown in Equation (3). Figure 9 displays the images of the interfacial transition zone (ITZ) between the FA-based geopolymer paste and OPC substrate as given by the SEM analysis.…”

Section: Phase Analysismentioning

confidence: 97%

“…et al (2018)[28] suggested that the formation of fayalite can occur through a chemical reaction of hydrated ferric oxyhydroxide with silica as shown in Equation (3).…”

mentioning

confidence: 99%

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Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate

et al. 2020

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This investigative study aims to study the mechanical and morphological properties of fly ash (FA)-based geopolymer paste as a repair material when applied on ordinary Portland cement (OPC) overlay concrete. The first part of this study investigates the optimal mix design of FA-based geopolymer paste with various NaOH concentrations of 8, 10, 12, and 14 M, which were used later as a repair material. The second part studies the bonding strength using a slant shear test between the geopolymer repair material and OPC substrate concrete. The results showed that a shorter setting time corresponds to the higher NaOH molarity, within the range of 53 and 30 min at 8 and 14 M, respectively. The compressive strength of FA-based geopolymer paste was found to reach 92.5 MPa at 60 days. Also, from the slant shear test results, prism specimens with 125 mm length and 50 mm wide have a large bond strength of 11 MPa at 12 M. The scanning electron microscopy/energy-dispersive X-ray (SEM/EDX) analysis showed that the OPC substrate has a significant effect on slant shear bond strength, where the presence of free cations of Ca2+ on the OPC substrate surface contributed to the formation of calcium alumina-silicate hydrate gel (C-A-S-H) by building various cross-links of Ca-O-Si.

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Section: Compressive Strength Of Fa-based Geopolymer Repair Materialsmentioning

confidence: 61%

Section: Phase Analysismentioning

confidence: 97%

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Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate

et al. 2020

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“…Figure 3 depicts the FTIR spectra of sand, binder, and specimens prepared with 20 % and 40 % binder to aggregate ratio. The results show that specimens had little or insigni cant amount of water within the matrix due to lack of H-O-H vibrations around 3600 cm-1 [43]. The absorption bands around 500 cm − 1 usually indicates the bending mode of Si-O-T (T may be Al or Si and in some cases Ca) [44].…”

Section: Ftir Analysis Of Specimens With Different Binder Contentmentioning

confidence: 96%

Enhancement of Waste Foundry Sand Mechanical Properties Through Stabilization Using Slag Based Geopolymer Binder

Sithole

Mashifana

Tsotetsi

2021

Preprint

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It is of paramount importance to minimize carbon emission generated from production of major building and construction materials used worldwide such as bricks and Ordinary Portland cement to achieve sustainability requirements. In this paper, the binding properties of the synthesized granulated blast furnace slag (GBFS) geopolymers were assessed by developing eco-friendly waste foundry sand bricks. Four different mix designs were prepared by blending GBFS based geopolymer binder with aggregates (waste foundry sand and crushed stones). The amount of GBFS geopolymer binder was varied from 0 to 40 %. The developed specimens were evaluated for mechanical properties, durability, structural performance, and environmental impact. The specimens synthesised with 40 % GBFS geopolymer binder at a L/ S ratio of 15 % and cured at 80 ℃ achieved the highest UCS of 12 MPa. The results showed that the developed specimens are acid resistant which suggest that they can be used in corrosive environments and do not pose any threat of environmental pollution for long-term use. In conclusion, GBFS-based geopolymers can be used as binders to fabricate building bricks that meet the minimum requirement of ASTM C62-10 that can be used in negligible weathering conditions.

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“…Additionally, the band at 990 cm -1 is most of time assigned symmetrical bending of the Si-O-T bonds [23], and Fe-O-Si when the solid precursor contains a significant amount of Fe 2 O 3 [24,25,26]. On the other hand, the band located at 1649 cm…”

Section: Fig 4 Ir Spectra Of Volcanic Ashmentioning

confidence: 99%

Physical and Mechanical Properties of a Porous Material Obtained by Low Replacement of Volcanic Ash by Aluminum Beverage Cans

Dickson¹,

Noussi

Ebongue

et al. 2021

AIR

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This study focuses on the evaluation of the physical and mechanical properties of a porous material based on a mixture of powder (Volcanic ash /Aluminum Beverage Cans) and a solution of phosphoric acid. Volcanic ash (VA) use was collected in one of the quarries of Mandjo (Cameroon coastal region), crushed, then characterized by XRF, DRX, FTIR and named MaJ. The various polymers obtained are called MaJ0, MaJ2.5, MaJ5, MaJ7.5 and MaJ10 according to the mass content of the additions of the powder from the aluminum beverage cans (ABCs). The physical and mechanical properties of the synthetic products were evaluated by determining the apparent porosity, bulk density, water absorption and compressive strength. The results of this study show that the partial replacement of the powder of VA by that of ABC leads to a reduction in the compressive strength (5.9 - 0.8 MPa) and bulk density (2.56 – 1.32 g/cm3) of the polymers obtained. On the other hand, apparent porosity, water absorption and pore formation within the polymers increases with addition of the powder from the beverage cans. All of these results allow us to agree that the ABCs powder can be used as a blowing agent during the synthesis of phosphate inorganic polymers.

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Microstructure and engineering properties of Fe2O3(FeO)-Al2O3-SiO2 based geopolymer composites

Cited by 101 publications

References 24 publications

Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate

Bonding Strength Characteristics of FA-Based Geopolymer Paste as a Repair Material When Applied on OPC Substrate

Enhancement of Waste Foundry Sand Mechanical Properties Through Stabilization Using Slag Based Geopolymer Binder

Physical and Mechanical Properties of a Porous Material Obtained by Low Replacement of Volcanic Ash by Aluminum Beverage Cans

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