Influence of Elevated Temperatures and Cooling Method on the Microstructure Development and Phase Evolution of Alkali-Activated Slag |
| |
| Authors: | Hua Fu Rui Mo Penggang Wang Yanru Wang Yubin Cao Wentao Guang Yao Ding |
| |
| Affiliation: | 1.School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China; (H.F.); (R.M.); (W.G.); (Y.D.);2.Centre for Future Materials, University of Southern Queensland, Toowoomba, QLD 4350, Australia; |
| |
| Abstract: | The performance of alkali-activated slag (AAS) under thermal treatment has received particular attention. In this study, the effect of five elevated temperatures (25, 200, 400, 600, and 800 °C) and two cooling methods (air cooling and water spraying) on the mechanical and durability properties, microstructure, and phase evolution of AAS was investigated. The results show that AAS mortars exhibit higher resistance to thermal attack than OPC in terms of strength and durability. AAS samples cooled in air show higher residual strength than those cooled by spraying water, which is mainly attributed to fewer cracks formed in the former. The resistance to carbonization of exposed AAS mortars depends on the pore size distribution, while that to chloride ion penetration depends on the porosity. Cooling methods show a minor effect on the phase evolution of reaction products, suggesting that the microstructure degradation is mainly responsible for the damage of AAS structures. This study provides fundamental knowledge for the thermally induced changes on AAS which contributes new ideas for the development of construction structures with higher fire resistance. |
| |
| Keywords: | alkali-activated slag elevated temperature cooling method durability phase evolution |
|
|
