• Montouillout, Valérie
• Allix, Mathieu
• Danezan, Abel
• Kaknics, Judit
• Bessada, Catherine
• Veron, Emmanuel
• Seixas, Wendy De
• Genevois, Cécile
• Fayon, Franck

Abstract

Blast furnace slag, by product of pig iron manufacturing, is a glassy material composed mainly of SiO2, CaO, Al2O3 and MgO, with some minor elements, such as Na, K, P or Ti, present in various quantities depending on the origin of the slag. They have been used for many years as a cement constituent (CEM II, CEM III and CEM V) or as a concrete addition, replacing significant volumes of Portland cement clinker. However GGBS containing cements can display various strength development at early ages depending mainly of their composition. Among minor elements, TiO2 has been identified to have a negative impact on reactivity, depending on the quantity and the oxidation state. In this study, we synthesized four model glasses mimicking the chemical composition of an industrial slag with and without titanium, and under oxidizing and reducing atmospheres. The structure of these glasses were characterized using different techniques such as XRD, multi-nuclear high resolution solid state NMR and EPR. The four glasses were then hydrated with a cement pore solution for 2, 7 and 14 days. A combination of XRD and various high resolution solid state NMR experiments was used to monitor specifically the evolution of vitreous network and of the different hydrated phases.

Topics

• impedance spectroscopy
• pore
• phase
• x-ray diffraction
• experiment
• glass
• glass
• strength
• cement
• chemical composition
• titanium
• iron
• electron spin resonance spectroscopy
• Nuclear Magnetic Resonance spectroscopy