| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Journal of the American Ceramic Society Awards Symposium
|
| Presentation Title |
A Thermodynamics-guided Framework to Design Spherical Lightweight Aggregate from Waste Coal Combustion Ash |
| Author(s) |
Mohammad Balapour, Thiha Thway, Rathin Rao, Newell Moser, Edward J Garboczi, Yick G. Hsuan, Sabrina Spatari, Yaghoob Farnam |
| On-Site Speaker (Planned) |
Mohammad Balapour |
| Abstract Scope |
Using a thermodynamics-based framework, the process to successfully manufacture synthetic lightweight aggregate (LWA) from waste coal combustion ash through sintering was investigated in which a delicate balance among three phenomena was required: (i) sufficient liquid phase formation during sintering, (ii) appropriate viscosity for the liquid-solid phase, and (iii) sufficient gas emission amount to form pores in the LWA. Using thermodynamics modeling, the liquid phase formation during sintering was quantified, where its correlation to X-ray computed tomography observations indicated that a minimum of 35 % by mass liquid phase content is necessary for gas-filled pores formation in LWA. The Browning and Krieger-Dougherty models were used to quantify the liquid and liquid-solid phases viscosity, respectively. A lower bound of 100 Pa·S for the viscosity was found to ensure the spherical shape of the LWA. Thermogravimetric analysis showed a considerable gas release potential for the LWA, creating gas-filled pores in the LWA. |