Print Email Facebook Twitter A review: The strength influence factors of slag and fly ash based alkali activated materials Part of: 4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites· list the conference papers Title A review: The strength influence factors of slag and fly ash based alkali activated materials Author Sun, Beibei (Ghent University, Belgium) Ye, Guang (Ghent University, Belgium) De Schutter, Geert (Ghent University, Belgium) Date 2021-04-29 Abstract Alkali-activated materials(AAM) are known to be environmentally friendly alternatives to cement-based materials because they can potentially reduce greenhouse gas emissions and reutilize industrial by-products. However, the application of AAM is still limited by the lack of mixture design regulation. Unlike cement, the very different chemical composition of the precusors and alkaline activators may result in a very fluctuating strength. In order to study the factors influencing the strength of slag and fly ash-based alkali-activated materials (BFS/FAAAM), and clarify their reaction mechanism, this paper reviews current knowledge about the mechanical properties and the reaction mechanisms of BFS/FA-AAM. The control factors of strength are BFS/binder ratio, Na2O/binder ratio, and SiO2/Na2O ratio. The ion concentrations, determined by these control factors, play a decisive role in the development of strength. Generally, the strength is proportional to the BFS/binder ratio. The best strength could be obtained at the optimum values of Na2O/binder ratio, and SiO2/Na2O ratio. The optimum values of the SiO2/binder ratio of BFS-AAM and FA-AAM are between 5.5%-8% and between 7-10%, respectively. The optimal values of the SiO2/Na2O ratio of BFS-AAM and FA-AAM are between 0.85-1.4 and between 0.6-1, respectively. For BFS/FA-AAM, the optimum ratio is still unknown. Further study is needed to investigate the effect of control factors on the mechanical properties of BFS/FA-AAM. Subject strength control factorsslag and fly ash based alkali-activated materialsreaction mechanism To reference this document use: http://resolver.tudelft.nl/uuid:d651f198-96e7-4ec9-9e4d-17277a3f179e Part of collection Conference proceedings Document type conference paper Rights (c) 2021 the authors Files PDF The strength influence fa ... erials.pdf 1.21 MB Close viewer /islandora/object/uuid:d651f198-96e7-4ec9-9e4d-17277a3f179e/datastream/OBJ/view