The effect of copper slag on the hydration and mechanical properties of cementitious mixtures

Tixier, R.; Devaguptapu, R.; Mobasher, Barzin

doi:10.1016/s0008-8846(97)00166-x

Cited by 105 publications

(48 citation statements)

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“…Most studies start from materials which have been oven dried at 105°C, assuming that all the evaporable water is driven off at temperatures lower than 105°C [13,42,76,79]. However, some researchers claim that adsorbed (evaporable) water still can be lost between temperatures of 105 and 130°C or even 150°C [26,45,54].…”

Section: Bound Watermentioning

confidence: 99%

TC 238-SCM: hydration and microstructure of concrete with SCMs

Scrivener¹,

et al. 2015

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This paper is the work of working group 2 of the RILEM TC 238-SCM. Its purpose is to review methods to estimate the degree of reaction of supplementary cementitious materials in blended (or composite) cement pastes. We do not consider explicitly the wider issues of the influence of SCMs on hydration kinetics, nor the measurement of degree of reaction in alkali activated materials. The paper categorises the techniques into direct methods and indirect methods. Direct methods attempt to measure directly the amount of SCM remaining at a certain time, such as selective dissolution, microscopy combined with image analysis, and NMR. Indirect methods infer the amount of SCM reacted by back calculation from some other measured quantity, such as calcium hydroxide consumption. The paper first discusses the different techniques, how they operate and the advantages and limitations along with more details of case studies on different SCMs. In the second part we summarise the most suitable approaches for each SCM, and the paper finishes with conclusions and perspectives for future work.

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Section: Bound Watermentioning

confidence: 99%

TC 238-SCM: hydration and microstructure of concrete with SCMs

Scrivener¹,

et al. 2015

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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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“…One of the greatest potential applications is in cement and concrete (Shi et al 2008). In cement production, it can be used as an iron adjusting material or as partial cement replacement (Al-Jabri et al 2006;Goñi et al 1994;Gorai et al 2003;Najimi et al 2011;Shi et al 2008;Taha et al 2004Taha et al , 2007Tixier et al 1997;Zain et al 2004). Regarding the latter, a major concern is the leaching of heavy metals; however, studies have shown that this is within regulatory limits.…”

Section: Introductionmentioning

confidence: 99%

Use of Secondary Slags in Completely Recyclable Concrete

Schepper

Verlé

Driessche

et al. 2015

J. Mater. Civ. Eng.

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A completely recyclable concrete (CRC) is designed to have a chemical composition equivalent to the one of general raw materials for cement production. By doing so, this CRC can be used at the end of its service life in the cement clinkering process without need for ingredient adjustments, and with improvement of the resource efficiency of cement and concrete production. Copper slag is interesting as an iron source for the production of such a CRC and can be added to concrete, either as alternative binder or as aggregate. By isothermal calorimetry and compressive strength tests it was found that the addition of copper slag as cement replacement is of minor interest. But a study toward the compressive strength and durability of concrete with copper slag as aggregate replacement had promising results. The performance of these concretes was comparable with or even better than the reference concrete, regarding strength and most durability aspects such as porosity and permeability, and resistance against carbonation and chloride ingress. Only the resistance to freezethaw attack with deicing agents was inferior.

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The effect of copper slag on the hydration and mechanical properties of cementitious mixtures

Cited by 105 publications

References 1 publication

TC 238-SCM: hydration and microstructure of concrete with SCMs

TC 238-SCM: hydration and microstructure of concrete with SCMs

Caracterización de escorias de cobre de fundiciones chilenas del Siglo XIX

Use of Secondary Slags in Completely Recyclable Concrete

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