| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Characterization of Minerals, Metals and Materials 2025: In-Situ Characterization Techniques
|
| Presentation Title |
Critical Issues on Fly-Ash Alkali-Activated Using Hydroxide and Carbonate Sources |
| Author(s) |
Ana Laura Riscado, Madeleing Taborda-Barraza, Thereza Ramos, Markssuel Marvila, Carlos Mauricio Vieira, Afonso Azevedo |
| On-Site Speaker (Planned) |
Afonso Azevedo |
| Abstract Scope |
Around the alkaline-activation’s world, fly ash with low calcium content often has limitations due to the need to apply thermal curing, accelerating reactions, and manifesting better mechanical performance. This limitation is justified by the need to manufacture materials at room temperature and dispense with logistical protocols that imply the use of thermal chambers. Therefore, looking for alternative activators capable of promoting polymerization at low temperatures, this study aims to evaluate the use of commercial activators, such as sodium and calcium hydroxide, sodium silicate and calcium and sodium carbonate, and alternative activators originating from eggshell, to activate fly ash and blast furnace slag (in lesser extent), at low temperatures (23°C and 30°C). These variations are evaluated using the setting start time, isothermal conduction calorimetry, viscosimetry, water absorption, and compressive strength. The definition of hybrid or ternary systems will facilitate applications for which fly ash manifests its contribution at early ages. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Composites, |