Effect of steel slag and curing temperature on the improvement in technological properties of biomass bottom ash based alkali-activated materials

Gómez-Casero, M.A.; Pérez‐Villarejo, Luis; Castro, Eulógio; Eliche-Quesada, D.

doi:10.1016/j.conbuildmat.2021.124205

Cited by 42 publications

(8 citation statements)

References 91 publications

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“…Compared with the regular rod-like Ca(OH) 2 crystal observed during the normal hydration process ( Figure 8 A), more calcium-modified silica gel was formed during 104°C CO 2 curing, which may be due to the alkali excitation effect at high temperatures ( Gómez-Casero et al., 2021 ; Aydın and Baradan, 2012 ) ( Figure 8 B). Carbonation products tended to form aragonite crystal and metastable vaterite rather than calcite as carbonation temperature increased ( Figures 8 C and 8D).…”

Section: Resultsmentioning

confidence: 93%

An industrial demonstration study on CO2 mineralization curing for concrete

Wang

Song

et al. 2022

iScience

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Section: Resultsmentioning

confidence: 93%

An industrial demonstration study on CO2 mineralization curing for concrete

Wang

Song

et al. 2022

iScience

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“…A combinação de precursores de baixo e alto teor de cálcio em um sistema álcali-ativado é motivação para uma série de pesquisas nos últimos anos (PHOO-NGERNKHAM et al, 2015;QIU et al, 2019;RAFEET et al, 2017;KÜRKLÜ, 2016;GÓMEZ-CASERO et al, 2021;SAMANTASINGHAR;SINGH, 2020). Tal sistema tem o potencial de oferecer algumas vantagens baseada na coexistência dos géis C-A-S-H e N-A-S-H (PROVIS; VAN DEVENTER, 2019).…”

Section: Sistema De Teor Intermediário De Cálciounclassified

Cimento Álcali-Ativado

Costa¹,

Cabral²,

Nogueira³

2022

Ciência E Engenharia De Materiais: Princípios E Fundamentos Em Pesquisa - Volume 2

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O termo material álcali-ativado é utilizado para definir argamassas, concretos e grautes obtidos com uso da matriz cimentícia álcali-ativada, isto é, cimento álcali-ativado, que é o material derivado da reação de uma fonte de metal alcalino com pó de silicato sólido. No entanto, na literatura é possível encontrar a descrição desse material com o uso de variadas nomenclaturas, que incluem: cerâmica alcalina, geocimento, geopolímero, hidrocerâmica, polímero inorgânico, vidro de polímero inorgânico, polímero mineral, cimento alcalino e uma variedade de outros nomes, incluindo várias marcas comerciais. Apesar dessa variedade de terminologia, todos descrevem materiais sintetizados utilizando a mesma tecnologia: ativação alcalina. Portanto, o foco do presente capítulo é elucidar as principais características, mecanismos químicos e produtos resultantes dos diferentes sistemas de álcali-ativação, conforme a literatura disponível. As principais fontes de informação foram artigos científicos disponíveis nos principais periódicos nacionais e internacionais, além de livros de referência na temática e normas técnicas. Desse modo, verificou-se que os cimentos álcali-ativados abrangem sistemas que apresentam altos teores de silício e cálcio, como as escórias de alto forno, e sistemas que apresentam baixo teor de cálcio, predominando o silício e o alumínio, como o metacaulim e a cinza volante classe F. Esse último sistema é comumente chamado de geopolímero. A combinação de materiais com baixo e alto teor de cálcio deu origem aos sistemas mistos, como exemplo o cimento composto de escória de alto forno e cinza volante. Essa subdivisão baseia-se no teor de cálcio presente no sistema, que desempenha um papel essencial na definição do conjunto de fases que compõe o material endurecido. Dessa forma, os cimentos álcali-ativados podem ser classificados em três tipos: sistemas de baixo teor de cálcio; sistemas de teor intermediário de cálcio; e sistemas de alto teor de cálcio.

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“…Steel slag (SSL) is an industrial by-product of steel-making, created when molten steel is separated from impurities consisting of liquid oxides containing iron and carbon. SSL contains crystalline compounds, and the predominant minerals include magnetite, tricalcium silicate, and dicalcium silicate, with a handful of free magnesium oxide and calcium oxide owing to the sufficiently low cooling rate of SSL [19][20][21]. The proportions of crystalline compounds in SSL are determined by manufacturing conditions, such as the cooling rate, cooling methods, and steel-making furnaces.…”

Section: Introductionmentioning

confidence: 99%

“…To explore a new method of applying SSL to facilitate management and reduce the severe environmental risk caused by the occupation of an increasing amount of land from the accumulation of SSL, trials have investigated the incorporation of SSL in geopolymer binders [19][20][21][26][27][28][29][30]. To date, various solid materials, such as high-calcium fly ash (FA), low-calcium FA, and metakaolin, have been used in combination with SSL to generate geopolymers to induce synergistic effects, leading to the influence of complementary advantages because geopolymerization and the chemical composition and microstructure of geopolymers are determined by natural characteristics, such as the amorphous phase and reactivity of the starting raw solid wastes [15,31].…”

Section: Introductionmentioning

confidence: 99%

The Performance and Reaction Mechanism of Untreated Steel Slag Used as a Microexpanding Agent in Fly Ash-Based Geopolymers

Zang,

Yao,

et al. 2024

Buildings

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Steel slag is an industrial by-product of the steelmaking process, which is under-utilized and of low value due to its characteristics. Alkali-activated technology offers the possibility of high utilization and increased value of steel slag. A geopolymer composition was composed of steel slag, fly ash, and calcium hydroxide. Four experimental groups utilizing steel slag to substitute fly ash are established based on varying replacement levels: 35%, 40%, 45%, and 50% by mass. The final samples were characterized by compressive strength tests, and Fourier-transform infrared spectroscopy measurements, thermogravimetric measurements, scanning electron microscopy with energy dispersive spectroscopy, X-ray diffraction, and mercury intrusion porosimetry were used to investigate the chemical composition and microstructure of the final products. Higher steel slag/fly ash ratios lead to a lower bulk density and lower compressive strength. The compressive strength ranges from 3.7 MPa to 5.6 MPa, and the bulk density ranges from 0.85 g/cm3 to 1.13 g/cm3. Microstructural and energy-dispersive X-ray spectroscopy analyses show that the final geopolymer products were a type of composite consisting of both calcium aluminate silicate hydrate and sodium aluminate silicate hydrate, with the unreacted crystalline phases acting as fillers.

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Effect of steel slag and curing temperature on the improvement in technological properties of biomass bottom ash based alkali-activated materials

Cited by 42 publications

References 91 publications

An industrial demonstration study on CO2 mineralization curing for concrete

An industrial demonstration study on CO2 mineralization curing for concrete

Cimento Álcali-Ativado

The Performance and Reaction Mechanism of Untreated Steel Slag Used as a Microexpanding Agent in Fly Ash-Based Geopolymers

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