engleski

RESTORING HISTORICAL BUILDINGS AMID CLIMATE RISIS: HYDRAULIC, WASTE-BASED LIME

Reducing greenhouse gas emissions and dependence on fossil fuels is the cornerstone of all European climate and energy strategies. At the same time, waste reduction and recycling are at the top of the European waste hierarchy. Therefore, the European Union (EU) is turning to renewable energy and sustainable options that address complex local conditions and growing energy and material needs. Bioenergy is the most important renewable energy source in the EU, accounting for more than 2/3 of the renewable energy mix. As wood is a carbon neutral energy source, it is one of the predominant sources of biomass for energy production in the EU. However, the continuous expansion of wood biomass power plants leads to the formation of wood biomass ash (WBA), a solid by-product of wood combustion on a large scale. The disposal of WBA is a problem that requires long-term strategic and sustainable solutions. Therefore, WBA is the focus of this paper as an alternative material with pozzolanic and/or hydraulic properties needed for the production of waste-based artificial hydraulic lime (AHL). This type of a novel hybrid WBA-lime binder would serve as an end result for the production of a repair mortar for historical buildings. Two different sources of locally available WBA were considered for the preparation of binders as mixtures of WBA and natural hydraulic lime (NHL) in different ratios. Based on the chemico-mineralogical composition and physical properties, the potential of WBA as a component of an AHL is evaluated. The contribution of the individual binder mixtures to mortar properties was analyzed on the basis of the demonstrated water demand, the flow diameter and the compressive and flexural strength according to EN 459-1.

Wood biomass ash, hydraulic lime, alternative binders, industrial waste, sustainability, cementless binder

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