| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
The American Ceramic Society Journal Awards Symposium
|
| Presentation Title |
Neutron Tomography Analysis of Permeability-Enhancing Additives in Refractory Castables |
| Author(s) |
Murilo Henrique Moreira, Stefano Dal pont, Alessandro Tengattini, Victor Carlos Pandolfelli |
| On-Site Speaker (Planned) |
Murilo Henrique Moreira |
| Abstract Scope |
Polymeric fibers are often used as additive for refractory castables because they can increase permeability and reduce pressurization risks that triggers explosive spalling. Despite the potential of engineering polymers to obtain desired properties, the required parameters for permeability enhancement remain unclear. This work investigates polypropylene (PP), polyethylene (PE) and cellulose fibers during refractory castables drying through rapid neutron tomography, enabling the in-situ visualization of water distribution. PE and cellulose fibers accelerate drying fronts earlier than PP, in which PE exhibits larger moisture accumulation, residual moisture behind its drying front and a slower drying rate at higher temperatures despite the early water removal initiation. In contrast, cellulose emerged as a better candidate, due to a swelling-shrinkage based mechanism. The neutron tomography observations unveil the dynamic and intricate effect of fibers in the permeability, emphasizing that optimal drying requires deep understanding of the underlying mechanisms to develop better additives and numerical models. |