Characterization and evaluation of the hydraulic activity of water-cooled slag and air-cooled slag

Mostafa, Nasser Y.; El-Hemaly, S. A. S.; Al-Wakeel, E. I.; El-Korashy, Sabry A.; Brown, Paul

doi:10.1016/s0008-8846(01)00497-5

Cited by 81 publications

(38 citation statements)

References 3 publications

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“…A number of research studies have shown that slag reactivity in alkaline activation processes depends largely on its component phases and vitreous structure (47)(48). No direct relationship between reactivity and vitreous phase content has been proven, however.…”

Section: Fundamentals Of Alkaline Activation In Calcium-rich Systems:mentioning

confidence: 99%

A review on alkaline activation: new analytical perspectives

et al. 2014

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For many years now the idea of including alkalis in a Portland cement matrix has been regarded as a daft or inexcusably erroneous proposition: despite its absurdity, that opinion has been widely accepted as a basic premise by the scientific and technical community working in the area of the chemistry of cement. In 1957 Glukhovsky proposed a working hypothesis in which he established a close relationship between alkalis and cementitious materials. That hypothesis has become consolidated and has served as a basis for developing a new type of binders, initially called "alkaline cements". The present paper reviews the most significant theoretical interpretations of the role played by alkalis in the formation of the "stony" structure of cement. It ends with a broad overview of the versatility of this type of materials for industrial applications and a discussion of the possibility of building on the existing legislation to meet the need for the future regulation of alkaline cement and concrete manufacture. RESUMEN: Activación alcalina: Revisión y nuevas perspectivas de análisis.Hace algunos años, la sola idea de la presencia de álcalis en una matriz de cemento Portland se consideraba casi como una aberración, o como un error imperdonable; convirtiéndose en un postulado básico (absurdo) ampliamente aceptado por la comunidad científica y técnica vinculada a la química de los cementos. En 1957 Glukhovsky propuso una hipótesis en la que se establecía una estrecha relación entre los álcalis y los materiales cementantes. Hoy día nadie duda de que dicha hipótesis ha servido de base para el desarrollo de una nueva clase de materiales cementantes: "cementos alcalinos". En el presente trabajo se hace una revisión sobre los aspectos teóricos más relevantes del papel de los álcalis en la formación de estos conglomerantes. También se da una visión genérica de su versatilidad, desarrollo industrial y estado de la normativa actual para regular en el futuro la fabricación de cementos y hormigones alcalinos.

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Section: Fundamentals Of Alkaline Activation In Calcium-rich Systems:mentioning

confidence: 99%

A review on alkaline activation: new analytical perspectives

et al. 2014

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“…From the experiments conducted by N.Y. Mostafa et al [6]. it was found that as expected WS showed higher activity than AS.…”

Section: A Type Of Slag Air Cooled or Water Cooledmentioning

confidence: 68%

“…This is because such types of slags are hydraulically unreactive. It was found that Air cooled and water cooled BFS do not have huge differences in their chemical composition [6]. The following table makes it very clear that both materials have nearly same composition of the major components.…”

Section: A Type Of Slag Air Cooled or Water Cooledmentioning

confidence: 91%

Use and Properties of Blast Furnace Slag as a Building Material- A Review

Jain¹

2014

Int. J. Recent Contrib. Eng. Sci. IT

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Abstract-This paper aims at bringing a literature review on the uses and properties of popular industrial and mineral byproduct slag. At the present, most industrial slags are being used without taking full advantage of their properties or disposed rather than used. The use of slag in replacing Portland cement by GGBFS is not very common. The traditional way to utilize metallurgical slags in cementing materials is to partially replace Portland cement. The practice of using such mineral admixtures in construction will reduce the need of portland cement and its use in various parts of the world, thus greatly reducing the amount of pollution and pave a way for a cleaner and more economical construction material, of which India is in a great need.The literary investigation was carried out on different forms of slag used in construction, i.e. slag aggregates, ground granulated blast furnace slag (GGBFS) and slag mixed with clinker in cement production. Many different properties were examined during the literature review, all segregated into separate categories based on the type of usage, particle size and chemical composition. The base samples ranged from cement sample to meter cubes, beams and concrete cubes. The properties investigated from various sources of literature were hydration, reactivity, hydraulic power and slump loss. Also properties related to durability and environmental effects like cabonation depth, chloride resistance, sulphate resistance, percentage of water absorption, heat resistance and resistance to freeze and thaw cycles are also discussed. Its activation with innovative methods and certain reasons were found out which attributed to such behaviour such as glass content, microstructure, pH nature, pore size etc.The behaviour of concrete samples were also investigated with some agents, i.e. samples with some extra chemical admixtures, air entraining agents. Also differentiation was done on the basis of formation of slag aggregates, i.e. the variation in properties of slag based construction materials vary when slag is created employing different techniques. The investigation will also explain the different problems faced by civil engineers in using slag as a major component in building materials.

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“…Porém, o uso direto da escória de aciaria no cimento não é recomendado devido à sua expansibilidade durante a hidratação, causada pelo CaO e MgO livres e pela fase RO rica em Mg [5,6]. A atividade hidráulica das escórias é afetada pela composição química, teor de fase vítrea e pela combinação de ambos [7]. Escórias com basicidade elevada geralmente são cristalinas, enquanto estruturas vítreas são observadas em escórias acidas com teores suficientes de Al2O3.…”

Section: Introductionunclassified

Modificação De Escória De Aciaria Fundida Para Aplicação Em Cimento

Neto¹,

Fredericci²,

Faria³

et al. 2017

Anais Do Congresso Anual Da ABM

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ResumoA escória de aciaria pode ser uma alternativa como mistura para o cimento portland, substituindo parcialmente a escória de alto-forno. Um processo pirometalúrgico tem sido desenvolvido para promover a modificação química da escória de aciaria LD. Os experimentos foram realizados através da refusão de 300 kg de escória de aciaria LD, seguido de sua modificação no estado líquido. Essas escórias foram resfriadas com o uso de esferas metálicas. Análises de fluorescência de raios-X (FRX) e microscopia eletrônica de varredura (MEV) das escórias revelaram uma relação entre composição química, condição de resfriamento e a formação de fases cristalina ou vítrea. As amostras de cimento foram obtidas através da mistura de 25% de escória modificada e 75% de cimento Portland, resultando em mais de 280 J/g de calor de hidratação acumulado em 72h, expansão abaixo de 0,1% em ensaio em autoclave e resistências à compressão acima de 42 MPa com 28 dias. O processo mostra potencial para ser aplicado no tratamento de escória de aciaria LD. Palavras-chave: Escória; Cimento; Modificação; Rejeitos. TREATMENT OF MOLTEN STEEL SLAG FOR CEMENT APPLICATION AbstractSteel slag can be an alternative in cement mineral admixture, partially as a substitute for blast furnace slag. A pyrometallugical process has been investigated to promote the chemical composition modification of molten steelmaking slag in a metallurgical reactor. Experiments were conducted by remelting 300 kg of steel slag followed by chemical modification of liquid slag. The modified slags were naturally cooled in the metallurgical reactor or cooled by steel balls. XRD and SEM analysis of slag samples revealed the relationship among chemical composition, cooling conditions and amorphous and crystalline phases. Cement samples were produced by mixing 25% of treated steelmaking slag with 75% of Portland cement, resulting in more than 280 J/g of accumulated hydration heat in 72 h, expansion lower than 0,1% in the autoclave tests and compressive strength higher than 42 MPa after 28 days. The process indicates potential to be applied as a steelmaking slag treatment.

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Characterization and evaluation of the hydraulic activity of water-cooled slag and air-cooled slag

Cited by 81 publications

References 3 publications

A review on alkaline activation: new analytical perspectives

A review on alkaline activation: new analytical perspectives

Use and Properties of Blast Furnace Slag as a Building Material- A Review

Modificação De Escória De Aciaria Fundida Para Aplicação Em Cimento

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