Alkali activated composites – An innovative concept using iron and steel slag as both precursor and aggregate

Cristelo, Nuno; Coelho, João; Miranda, Tiago F. S.; Palomo, A.; Fernández-Jiménez, Ana

doi:10.1016/j.cemconcomp.2019.04.024

Cited by 42 publications

(15 citation statements)

References 17 publications

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“…While the LFS presents several crystalline phases, namely calcio, olivine, andradite, calcite, cuspidine, titanite, and larnite, it presented mostly crystalline structures. The slag presents a slight halo, between 27 and 40°(2q), characteristic of vitreous/ amorphous materials (22), while the fly ash and ceramic residue showed a similar halo, although between 2q ≈ [25 -30]º.…”

Section: Methodsmentioning

confidence: 99%

“…Crystalline phases of Mu in the pastes were also displaced in range, from 28 -30°(2q) to 30 to 35°(2q) in contrast to CR and FA XDR diffractograms (Figure 3). These variations are a consequence of the formation of amorphous phases in the aluminosilicate gel, which will partially crystalize, in time (zeolitic precursor) (22)(23)(24). The anorthite (A) was identified in the four mixtures since the CR is the major component.…”

Section: Mineralogical and Microstructural Characterizationmentioning

confidence: 99%

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Alkali activation of recycled ceramic aggregates from construction and demolition wastes

Gaibor

Coelho²,

Leitão

et al. 2020

Mater. construcc.

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Environmental concerns are becoming increasingly more significant worldwide, thus creating the urgent need for new sustainable alternatives in the industrial sector. The present study assesses the fundamental properties of ceramic residue (CR) originated by demolition operations, specifically, the floor and wall tiles and sanitaryware furniture, for further incorporation in the construction sector, namely in alkali-activated binders, mixed with other better-known precursors - fly ash (FA) and ladle furnace slag (LFS). Different CR/FA and CR/LFS weight ratios were considered and analyzed by mechanical behavior and microstructural analysis, which included uniaxial compression strength (UCS) tests, Scanning Electron Microscopy (SEM), X-ray Energy Dispersive Analyser (EDX), X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Results obtained showed that the combination of CR and FA or LFS, activated with sodium silicate, produced UCS values higher than 20 MPa and 59 MPa, respectively, after 90 days curing.

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Section: Methodsmentioning

confidence: 99%

Section: Mineralogical and Microstructural Characterizationmentioning

confidence: 99%

Alkali activation of recycled ceramic aggregates from construction and demolition wastes

Gaibor

Coelho²,

Leitão

et al. 2020

Mater. construcc.

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“…Iron and steel slag (ISS) is a byproduct of iron refining processes [ 1 , 2 , 3 ]. In this research, steel-making slag, which was produced specifically during the steel-making process, was used.…”

Section: Introductionmentioning

confidence: 99%

Iron Elution from Iron and Steel Slag Using Bacterial Complex Identified from the Seawater

et al. 2021

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Iron and steel slag (ISS) is a byproduct of iron refining processes. The lack of iron in seawater can cause barren grounds where algae cannot grow. To improve the barren grounds of the sea, a supply of iron to the seawater is necessary. This study focused on bacteria interacting with ISS and promoting iron elution in seawater. Sulfitobacter sp. (TO1A) and Pseudomonas sp. (TO1B) were isolated from Tokyo Bay and Sagami Bay. The co-culture of both bacteria promoted more iron elution than individual cultures. After the incubation of both bacteria with ISS, quartz and vaterite appeared on the surface of the ISS. To maintain continuous iron elution from the ISS in the seawater, we also isolated Pseudoalteromonas sp. (TO7) that formed a yellow biofilm on the ISS. Iron was eluted by TO1A and TO1B, and biofilm was synthesized by TO7 continuously in the seawater. The present research is expected to contribute to the improvement of ISS usage as a material for the construction of seaweed forests.

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“…At present, construction regulations in many countries stipulate an upper limit on the use of these materials; however, researchers continue efforts to develop new materials that could completely replace cement in civil construction. Alkali-activated cementless composites (AAC) and geopolymer are currently the main focus of this research [5][6][7]. AAC and geopolymers use fly ash, ggbs, and other supplementary cementitious materials (or their by-products) presenting pozzolanic activity [8][9].…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties of Ternary Cementless Blended Materials

Lin

Korniejenko

Hebda

et al. 2020

Int. j. eng. technol. innov.

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A new non-cement blended materials is developed as a full replacement of cement without alkali activator. This study was conducted to explore a suitable method for activating new ternary green materials with desulfurization gypsum, water-quenched blast-furnace slag and co-fired fly ash from circulating fluidized bed combustion as non-cement inorganic binder. Test subject was included flowability, compressive strength, absorption, total charge-passed from rapid chloride permeability test, chloride diffusion coefficient from accelerated chloride migration test and SEM observation. Test results indicate that a ternary mixture containing 1% desulfurization gypsum, 60% water-quenched blast-furnace slag and 39% co-fired fly ash was a suitable development in compressive strength. The new non-cement blended materials were performed a well compressive strength, lower absorption, and lower chloride diffusion coefficient. In addition, the compressive strength decreased as the inclusion of desulfurization gypsum increased. It was concluded that using desulfurization gypsum alone decreased the setting time and compressive strength. SEM micrographs were verified the development in compressive strength originated from the C-S-H and C-A-S-H gel produced by Ca(OH)2, SiO2, and Al2O3.

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Alkali activated composites – An innovative concept using iron and steel slag as both precursor and aggregate

Abstract: Alkali activated composites -An innovative concept using iron and steel slag as both precursor and aggregate, Cement and Concrete Composites (2019), doi:

Cited by 42 publications

References 17 publications

Alkali activation of recycled ceramic aggregates from construction and demolition wastes

Alkali activation of recycled ceramic aggregates from construction and demolition wastes

Iron Elution from Iron and Steel Slag Using Bacterial Complex Identified from the Seawater

Engineering Properties of Ternary Cementless Blended Materials

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