Title

Zinc Oxide Addition in Cement Pastes to Study the Viability of Recycling Electric Arc Furnace (EAF) Dust in Civil Construction

Zinc Oxide Addition in Cement Pastes to Study the Viability of Recycling Electric Arc Furnace (EAF) Dust in Civil Construction

Authorship

BREHM, FELICIANO; MOLIN, DENISE DAL; VILELA, ANTÔNIO CEZAR FARIA; MORAES, CARLOS ALBERTO MENDES

BREHM, FELICIANO

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MOLIN, DENISE DAL

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VILELA, ANTÔNIO CEZAR FARIA

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MORAES, CARLOS ALBERTO MENDES

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DOI

10.5151/2594-357x-34Red-725-734

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Abstract

EAF dust recycling has become necessary, specially, due to Environment Agencies Regulations to final disposition of such waste. One of the alternatives for it’s recycling is the addition in concrete pavement. However, this addition retards the beginning of the hydration reactions of the cement, which retardation does not permit its use. This retardation is attributed to the contained zinc in the EAF dust. This element is present in the EAF dust as two compounds, franklinite (FeZn₂O₄) and zincite (ZnO). This work has the aim to study the phenomena related to the retardation of the beginning of hydration reactions, caused by the addition of ZnO into cement paste. 10 wt% of ZnO were added to cement pastes. The samples with and without ZnO were analyzed via Scanning Electron Microscopy (SEM) e X-Ray Diffraction in different ages to evaluate the phenomena occurred during the hydration of the cement pastes.

EAF dust recycling has become necessary, specially, due to Environment Agencies Regulations to final disposition of such waste. One of the alternatives for it’s recycling is the addition in concrete pavement. However, this addition retards the beginning of the hydration reactions of the cement, which retardation does not permit its use. This retardation is attributed to the contained zinc in the EAF dust. This element is present in the EAF dust as two compounds, franklinite (FeZn₂O₄) and zincite (ZnO). This work has the aim to study the phenomena related to the retardation of the beginning of hydration reactions, caused by the addition of ZnO into cement paste. 10 wt% of ZnO were added to cement pastes. The samples with and without ZnO were analyzed via Scanning Electron Microscopy (SEM) e X-Ray Diffraction in different ages to evaluate the phenomena occurred during the hydration of the cement pastes.

Keywords

hydration, cement, ZnO, EAF dust, retardation

hydration, cement, ZnO, EAF dust, retardation