Performance of alkali activated slag concrete mixes incorporating copper slag as fine aggregate

Mithun, B. M.; Narasimhan, M. S.

doi:10.1016/j.jclepro.2015.06.026

Cited by 239 publications

(52 citation statements)

References 17 publications

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“…Slags from extracting metal processes are conventionally considered as waste materials (Nazari and Sanjayan, 2015). In construction, copper slag (CS) is used in fillings, embankments, drainage, ballast, as aggregates in mortars, concrete (Thomas and Gupta, 2013;Mithun and Narasimhan, 2015) and asphalt mixtures (Hassan and Al-Jabri, 2011), as abrasive material (Kambham et al, 2007), as a cement substitute (Shi and Qian, 2000;Moura and Coutinho, 2004;Zain et al, 2004;Al-Jabri et al, 2006;Moura et al, 2007;Taha et al, 2007;Sánchez de Rojas et al, 2008;Brindha et al, 2010;Chew and Bharati, 2010;Brindha and Nagan, 2011;Najimi et al, 2011;Peyronnard and Benzaazoua, 2011), as raw material in the manufacture of Portland cement (PC) (Ariño and Mobasher, 1999;Chockalingam et al, 2013;García Medina et al, 2006;Gorai et al, 2003;Kosmatka et al, 2003) and also as binders in the manufacture of alkali-activated (AA) cements Malolepszy, 1989, 1994;Shi et al, 2008;Iacobescu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Use of ancient copper slags in Portland cement and alkali activated cement matrices

Nazer

Payá

Borrachero

et al. 2016

Journal of Environmental Management

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Some Chilean copper slag dumps from the nineteenth century still remain, without a proposed use that encourages recycling and reduces environmental impact. In this paper, the copper slag abandoned in landfills is proposed as a new building material. The slags studied were taken from Playa Negra and Púquios dumps, both located in the region of Atacama in northern Chile. Pozzolanic activity in lime and Portland cement systems, as well as the alkali activation in pastes with copper slag cured at different temperatures, was studied. The reactivity of the slag was measured using thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray diffraction (XRD), electrical conductivity and pH in aqueous suspension and Fourier Transform Infrared Spectroscopy (FTIR). Furthermore, copper slag-Portland cement mortars with the substitution of 25% (by weight) of cement by copper slag and alkali-activated slag mortars cured at 20 and 65 °C were made, to determine the compressive strength. The results indicate that the ancient copper slags studied have interesting binding properties for the construction sector.

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Section: Introductionmentioning

confidence: 99%

Use of ancient copper slags in Portland cement and alkali activated cement matrices

Nazer

Payá

Borrachero

et al. 2016

Journal of Environmental Management

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“…En la literatura científica se reportan pocos estudios sobre caracterización de EC antiguas (Ros-Latienda y Fernández-Carrasquilla, 2013) y del uso de EC de vertederos antiguos como un material conglomerante (Nazer et al, 2016). Otros estudios determinaron las propiedades cementantes de las EC en la fabricación de morteros (Ariño y Mobasher, 1999;Tixier et al, 1997;Taha et al, 2007;Sánchez de Rojas et al, 2008;Nazer et al, 2013) y hormigones (Al-Jabri et al, 2011;Thomas and Gupta, 2013;Mithun and Narasimhan, 2016).…”

Section: Introductionunclassified

Caracterización de escorias de cobre de fundiciones chilenas del Siglo XIX

Nazer¹,

Payá²,

Borrachero³

et al. 2016

REVMETAL

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RESUMEN:El objetivo de este trabajo es caracterizar 4 escorias de fundiciones de cobre del siglo XIX, procedentes de vertederos abandonados en la Región de Atacama -Chile, utilizando las técnicas de fluorescencia de rayos X (FRX), difracción de rayos X (DRX), microscopía electrónica de barrido (SEM), análisis de partículas por difracción láser (ADL), espectrometría infrarroja por transformadas de Fourier (FTIR) y análisis termogravimétrico (ATG). Las escorias de cobre estudiadas fueron clasificadas químicamente como escorias ácidas, con mayor contenido de SiO 2 (38 -49%) que de Fe 2 O 3 (18 -37%), y con una importante cantidad de CaO (8-26%) y Al 2 O 3 (5-8%). Su mineralogía y estructura es variada, presentando una de ellas una estructura amorfa y las tres restantes, una estructura cristalina con cierto carácter amorfo. Las fases minerales mayoritarias presentes en las escorias de cobre son diópsido, fayalita, magnetita, cristobalita y clinoferrosilita. Los niveles de calcio indicarían que las escorias poseen propiedades cementantes para ser utilizadas en materiales de construcción. Además, la importante cantidad de escoria disponible y el contenido de CuO (0,6 -1,2%) muestran que puede ser de interés como materia prima en la recuperación del metal. ABSTRACT: Characterization of chilean copper slag smelting nineteenth century. The aim of this work is to characterize four copper smelters slag nineteenth century, from abandoned landfills in Atacama Region -Chile, using the techniques of X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), particle analysis by laser diffraction (ADL), Fourier Transform Infrared Spectroscopy (FTIR) and thermogravimetric analysis (TGA). Copper slags studied were chemically classified as acidic slags, this slags presented higher SiO 2 content (38-49%) than Fe 2 O 3 (18-37%) and a significant amount of CaO (8-26%) and Al 2 O 3 (8.5%). Mineralogy and structure was varied, presenting one of them an amorphous structure and the remaining three, a crystalline structure with partially amorphous character. The majority mineral phases presented in the copper slag were diopside, fayalite, magnetite, cristobalite and clinoferrosilita. Calcium levels indicate that the slags could have cementitious properties for use as a binder in construction materials. Moreover, the significant amount of slag available and CuO content (0.6-1.2%) show that may be of interest as raw material for metal recovery.

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“…can act as major admixtures that can be used in place of OPC at different percentages. This will also reduce the risk of dumping these industrial wastes in landfills which accounts for decreased land use and environmental pollution (Mithun and Narasimhan, 2016;Palankar et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Image Enhancement Based On Fusion Using 2d Lpdct And Modified Pca

Mohan¹,

Kiran²,

Vasudeva³

et al. 2019

IJEAT

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Secondary Aluminium Drossis(SAD) generated when resmelting process is done in an aluminium industry to recover residual aluminium, wherein primary adross is taken as a raw material. It is completely a waste product and hazardous to dispose it into landfills. This is rich in aluminium oxide and having traces of few heavy metals. It is necessary to check the eco-friendly methods of solidification of this material. One of the feasible methods of solidifying the industrial wastes is using them in production of cement concrete. In this study, behaviour of secondary SAD as a partial replacement for Ordinary Portland Cement is evaluated. Secondary SAD is replaced by 5, 10, 15 and 20% of Ordinary Portland Cement. Consistency and setting time of cement paste samples are determined which shows the lag in setting time of paste. Workability and setting time of concrete mixes with 5, 10, 15 and 20% of secondary SAD as a binder, are evaluated. Retardation of setting time and increase in the workability are the main observations of this study. As the percentage of secondary SAD increases, the setting time also increases. This may be considered as a reason to utilize such concrete mixes in hot weather conditions wherein delayed setting time is an added advantage. Therefore, retardation of setting time is the positive impact of secondary SAD. Keeping in view of the fact that there can be decrement in strength with increased binder replacement and the workability requirements, only 20% of secondary SAD is replaced.

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Performance of alkali activated slag concrete mixes incorporating copper slag as fine aggregate

Cited by 239 publications

References 17 publications

Use of ancient copper slags in Portland cement and alkali activated cement matrices

Use of ancient copper slags in Portland cement and alkali activated cement matrices

Caracterización de escorias de cobre de fundiciones chilenas del Siglo XIX

Image Enhancement Based On Fusion Using 2d Lpdct And Modified Pca

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