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Utilization of LD slag in the production of hydraulic road binders

Mahieux, P.Y. / Aubert, J.E. / Escadeillas, G.

This communication reports on the characterization of LD slag (LDS) and the study of its utilization in the production of hydraulic road binders. X -ray diffraction has shown that the main minerals present in LD slag are calcium silicates (Ca2SiO4 and Ca3SiO5), dicalcium ferrite (Ca2Fe2O5), calcite (CaCO3), portlandite (Ca(OH)2), lime (CaO) and a solid solution of magnesium iron oxide (MgOxFeOy). The reactivity of LD slag was studied using X-ray diffraction on hydrated slag pastes. The results show that the LD slag is poorly reactive with water: the hydration of free lime leads to the formation of portlandite and a few part of tricalcium silicate forms calcium silicate hydrated. In spite of these reactions, no setting and no hardening were observed on hydrated material. So, it was decided to use the free lime contained in the LD slag to activate Ground Granulated Blast Furnace Slag (GGBFS) in order to produce a blended binder composed of metallurgical residues. Few percents of catalyst were added to the mixture to accelerate its setting. The results show that it was possible to produce a hydraulic road binder with approximately 50 % of LD slag. Moreover, the stability study showed that there was no problem of expansion with such a binder.

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Utilization of LD slag in the production of hydraulic road binders

Mahieux, P.Y. / Aubert, J.E. / Escadeillas, G.

This communication reports on the characterization of LD slag (LDS) and the study of its utilization in the production of hydraulic road binders. X -ray diffraction has shown that the main minerals present in LD slag are calcium silicates (Ca2SiO4 and Ca3SiO5), dicalcium ferrite (Ca2Fe2O5), calcite (CaCO3), portlandite (Ca(OH)2), lime (CaO) and a solid solution of magnesium iron oxide (MgOxFeOy). The reactivity of LD slag was studied using X-ray diffraction on hydrated slag pastes. The results show that the LD slag is poorly reactive with water: the hydration of free lime leads to the formation of portlandite and a few part of tricalcium silicate forms calcium silicate hydrated. In spite of these reactions, no setting and no hardening were observed on hydrated material. So, it was decided to use the free lime contained in the LD slag to activate Ground Granulated Blast Furnace Slag (GGBFS) in order to produce a blended binder composed of metallurgical residues. Few percents of catalyst were added to the mixture to accelerate its setting. The results show that it was possible to produce a hydraulic road binder with approximately 50 % of LD slag. Moreover, the stability study showed that there was no problem of expansion with such a binder.

Utilization of LD slag in the production of hydraulic road binders

Mahieux, P.Y. / Aubert, J.E. / Escadeillas, G.

This communication reports on the characterization of LD slag (LDS) and the study of its utilization in the production of hydraulic road binders. X -ray diffraction has shown that the main minerals present in LD slag are calcium silicates (Ca2SiO4 and Ca3SiO5), dicalcium ferrite (Ca2Fe2O5), calcite (CaCO3), portlandite (Ca(OH)2), lime (CaO) and a solid solution of magnesium iron oxide (MgOxFeOy). The reactivity of LD slag was studied using X-ray diffraction on hydrated slag pastes. The results show that the LD slag is poorly reactive with water: the hydration of free lime leads to the formation of portlandite and a few part of tricalcium silicate forms calcium silicate hydrated. In spite of these reactions, no setting and no hardening were observed on hydrated material. So, it was decided to use the free lime contained in the LD slag to activate Ground Granulated Blast Furnace Slag (GGBFS) in order to produce a blended binder composed of metallurgical residues. Few percents of catalyst were added to the mixture to accelerate its setting. The results show that it was possible to produce a hydraulic road binder with approximately 50 % of LD slag. Moreover, the stability study showed that there was no problem of expansion with such a binder.

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Title:

Utilization of LD slag in the production of hydraulic road binders

Additional title:

Die Verwendung von LD-Schlacke bei der Herstellung von hydraulischen Bindern im Straßenbau

Contributors:

Mahieux, P.Y. (author) / Aubert, J.E. (author) / Escadeillas, G. (author)

Published in:

Slag Products - Providing Sustainable Solutions for the Built Environment, Euroslag, European Slag Conference, 5 ; 157-165

EUROSLAG Publication ; 4

Publication date:

2008

Size:

9 Seiten, 2 Bilder, 4 Tabellen, 10 Quellen

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

chemische Zusammensetzung , Druckfestigkeit , freier Kalk , Gemisch , granulierte Schlacke , Hydratation , hydraulisches Bindemittel , Katalysator (Verfahrenstechnik) , LD-Schlacke , Röntgenbeugung , Straßenbau

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