ActiSlag Webinar

Réactivité à jeune age des laitiers de haut-fourneaux dans des matrices cimentaires

ActiSlag is a four-year RFCS project with the aim to increase ground granulated blast furnace slag (GGBS) value and extend its field of applications via improving short-term reactivity.
To achieve this goal, we investigated the relationship between slag characteristics (glass structure, microstructure) and slag activation mechanisms (dissolution / hydration).

In this project the two industrial partners – Ecocem and ArcelorMittal – were reinforced with four research laboratories combining their expertise from different fields: civil engineering (LMDC), glass science (TU Clausthal), slag value creation (FEhS) and high-resolution measurements (CNRS-CEMHTI) to reach these objectives.

In this project the two industrial partners – Ecocem and ArcelorMittal – were reinforced with four research laboratories combining their expertise from different fields: civil engineering (LMDC), glass science (TU Clausthal), slag value creation (FEhS) and high-resolution measurements (CNRS-CEMHTI) to reach these objectives.

This webinar is an overview of the work and results achieved over the last four years.

Agenda

>    Introduction – Judit Kaknics (ArcelorMittal Global R&D)

o   WP1: Characterization of industrial samples

• Classical characterization and selection of industrial GBS samples – Andreas Ehrenberg (FEhS)
• Estimate the cooling rate of GBS particles – Method development & industrial samples – Daniel Hart (TU Clausthal)
• Describing the glass structure and polymerization degree of GBS – Valérie Montouillout (CNRS-CEMHTI)

o   WP2: Upstream modification of granulated blast furnace slag

• Chemical modifications of major and minor compounds and investigation of industrial feasibility – Judit Kaknics (ArcelorMittal Global R&D)
• Effect of cooling rate on slag mechanical performance – Andreas Ehrenberg (FEhS) & Daniel Hart (TU Clausthal)

o   WP3: Optimal combination of upstream and downstream activation of granulated blast furnace slag

• Combining upstream and downstream modifications – Simon Blotevogel (LMDC & Ecocem)
• Understanding of hydration mechanism – Simon Blotevogel (LMDC & Ecocem)
• Role of TiO₂ – Simon Blotevogel (LMDC & Ecocem)

o   WP4: Product development: formulations for specific markets

• Development of concrete and tile adhesive formulations with modified GGBS – Simon Blotevogel (LMDC & Ecocem)

>    Main conclusions of the project and discussion