Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Utilisation of Wood Ash in Cement-Based Materials
Wood ashes originating from combustion of wood and woody biomass were investigated with the aim of utilising wood ash as a partial cement replacement. The physicochemical properties of wood ashes varied significantly depending on the combustion technique and temperature, the type of woody biomass used etc. Multivariate data analysis of chemical compositions was performed to determine which production parameters yielded the wood ash most suitable for utilisation as a partial cement replacement in cement-based materials. The standards EN 450 [1] and EN 197 [2] were used for the assessment of possible pozzolanic and hydraulic activity, respectively, in the multivariate data analysis. The multivariate data analysis revealed that the combustion technique had the greatest influence on the physicochemical characteristics of the wood ash. It was determined that wood ashes originating from grate combustion had the highest probability of possessing hydraulic properties, while, wood ashes originating from fluidised bed combustion had the highest probability of possessing pozzolanic properties. Based on this analysis, two wood ashes were selected for further investigations: one as the wood ash most likely to possess hydraulic properties and the other as the wood ash most likely to possess pozzolanic properties. Pozzolanic activity was tested on mixtures with 20% cement replacement with wood ash, and hydraulic activity was assessed based on the phase and strength development of 100% wood ash and water mixtures. Contrary to the results obtained by multivariate data analysis, both of the selected wood ashes displayed hydraulic properties (they set, hardened and developed strength) and neither of them showed pozzolanic activity. Despite both possessing hydraulic properties, a large difference in the strength development of the two wood ash and water mixtures was observed. Subsequent analysis of the phase development determined the formation of ettringite as a major factor in strength development. Formation of ettringite ...
Utilisation of Wood Ash in Cement-Based Materials
Wood ashes originating from combustion of wood and woody biomass were investigated with the aim of utilising wood ash as a partial cement replacement. The physicochemical properties of wood ashes varied significantly depending on the combustion technique and temperature, the type of woody biomass used etc. Multivariate data analysis of chemical compositions was performed to determine which production parameters yielded the wood ash most suitable for utilisation as a partial cement replacement in cement-based materials. The standards EN 450 [1] and EN 197 [2] were used for the assessment of possible pozzolanic and hydraulic activity, respectively, in the multivariate data analysis. The multivariate data analysis revealed that the combustion technique had the greatest influence on the physicochemical characteristics of the wood ash. It was determined that wood ashes originating from grate combustion had the highest probability of possessing hydraulic properties, while, wood ashes originating from fluidised bed combustion had the highest probability of possessing pozzolanic properties. Based on this analysis, two wood ashes were selected for further investigations: one as the wood ash most likely to possess hydraulic properties and the other as the wood ash most likely to possess pozzolanic properties. Pozzolanic activity was tested on mixtures with 20% cement replacement with wood ash, and hydraulic activity was assessed based on the phase and strength development of 100% wood ash and water mixtures. Contrary to the results obtained by multivariate data analysis, both of the selected wood ashes displayed hydraulic properties (they set, hardened and developed strength) and neither of them showed pozzolanic activity. Despite both possessing hydraulic properties, a large difference in the strength development of the two wood ash and water mixtures was observed. Subsequent analysis of the phase development determined the formation of ettringite as a major factor in strength development. Formation of ettringite ...
Utilisation of Wood Ash in Cement-Based Materials
Sigvardsen, Nina Marie (Autor:in)
01.01.2020
Sigvardsen , N M 2020 , Utilisation of Wood Ash in Cement-Based Materials . Technical University of Denmark, Department of Civil Engineering .
Buch
Elektronische Ressource
Englisch
DDC:
690
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