engleski

Sustainable pre-treatment of wood biomass ash for partial cement replacement

In July 2019, Croatian energy market operator had 38 contracts for electricity from renewable energy sources (RES) with power plants under construction. 50% of these were for biomass power plants and represented 19% of planned install power. While the increasing number of plants creates more wood biomass ash (WBA) to manage, landfilling prices are rising and although this research is done locally, the problem is global. In 1882 the first coal fired power plant was built in London as a project by Thomas Edison. The first high-volume coal fly ash recycles in concrete was done to repair a part of the Hoover Dam in 1942. In the 80s, with first legal guidelines and construction expansion, recycling of coal ash in concrete become routine. Biomass has been used as heat energy since people learned to control fire, but when speaking about RES, we refer to modern biomass combustion systems that started to sprout in developed countries during the 90s. Extensive research on the characterization of WBA and its influence on concrete properties has been going on during the last few years. Research has also been done on the impact of recycling for other fields trying to find a quicker solution for ash disposal this time. For now, we know that WBA can be used as an active (replacement of cement) or inactive (filler, sand substitute) concrete component. Fly WBA is usually compared with coal fly ash, but ash properties vary depending on many factors - from type and growth conditions, through the combustion system, to ash management on site. The link between power plants and the concrete industry should be established through consistency and quality control. This could be achievable by establishing ash pre-treatments. Treated ashes could be a more reliable material for larger scale cement replacement.

wood biomass ash, fly ash, cementitious materials, concrete, pre-treatment, grinding, milling

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