Nano-engineered aluminosilicate cementitious materials

Projektbeschreibung

Eine nachhaltige Alternative für Bindemittel aus Portlandzement

Beton ist ein Verbundwerkstoff, der aus einer Mischung von Aggregaten und Paste besteht. Die Aggregate sind dabei Sand und Kies oder Schotter; die Paste setzt sich aus Wasser und Portlandzement zusammen. 10 bis 15 % des Betons bestehen aus Zement. Durch Hydratation härten Zement und Wasser aus und binden die Aggregate in eine gesteinsähnliche Masse. Das EU-finanzierte Projekt NEASCMs will Zementbindemittel untersuchen, die eine CO2-arme Alternative für Portlandzement darstellen sollen. Mithilfe von Nanotechnologieverfahren wird das Projektteam mehrere zementartige Materialien herstellen, die verschiedene Quellen für Aluminosilikat-, Karbonat- und Sulfatbindemittel enthalten. Damit sollen Bauvorhaben und die Verfestigung/Stabilisierung nachhaltiger gestaltet werden. Die Projektarbeit wird zukunftsträchtige Möglichkeiten zur effizienten und kostengünstigen Produktion und Verwendung von neuen Bindemitteln eröffnen und so den Weg für eine umweltfreundliche Betonherstellung ebnen.

Ziel

The project “Nano-Engineered Aluminosilicate Cementitious Materials” (NEASCMs) is designed for training the fellow by preparing low-carbon cementitious binders for sustainable construction and solidification/stabilization, S/S. Effects of nanoengineering on the regulation of the hydration and hardening processes of aluminosilicate-based cementitious binders for sustainable constructions, as well as its roles on the solidification/stabilization of aluminosilicate-based grains/wastes for environmental protection will be explored. Nanoengineering will be utilized for preparing low-carbon cementitious materials containing of different sources of Aluminosilicates, Carbonates and Sulfates (ACS) binders for sustainable construction. The hydration kinetics and performance of ACS binders will be tailored through the optimization of a combination of cement and minor ions (such as Mg, Fe, Cl). The mechanical properties and durability will be systematically studied for evaluation of performance. Secondly, effects of nanoengineering on S/S of typical aluminosilicate-based grains/wastes for environmental protection will be investigated. Solidification/stabilization using nanoengineered aluminosilicates will be studied and modelled thermodynamically. Cases such as solidification/stabilization of soil/construction wastes, mining wastes will be researched, and the environment features, such as the solidification capability, the leachability of the wastes will be investigated through mechanical testing and sequential extraction procedures (SEP), etc. Life-cycle assessment (LCA) will be used for a comprehensive understanding of the sustainability of the production and utilization of the new binders, baselined against Portland cement by taking the transportation, production, usage, and recycling stages into consideration. This project will shed a light on the preparation of low-carbon cementitious binders featuring great intellectual merits and broad engineering implications.