Hydration and Compressive Strength of Activated Blast-Furnace Slag–Steel Slag with Na2CO3 |
| |
| Authors: | Yunfeng Wang Bo Jiang Ying Su Xingyang He Yingbin Wang Sangkeun Oh |
| |
| Affiliation: | 1.School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China; (Y.W.); (Y.S.); (Y.W.); (S.O.);2.School of Architecture, Seoul National University of Science and Technology, Seoul 01811, Korea |
| |
| Abstract: | Alkali-activated materials (AAMs) are regarded as an alternative cementitious material for Portland cement with regards to sustainable development in construction. The purpose of this work is to investigate the properties of activated blast-furnace slag (BFS)–steel slag (SS) with sodium carbonate (NC), taking into account BFS fineness and Na2O equivalent. The hydration was investigated by rheological behavior and pH development. The hydrates were characterized by TG-DTG and XRD, and the microstructure was analyzed by SEM and MIP. Results showed that the rheology of activated BFS-SS pastes was well-fitted with the H-B model and affected by BFS fineness and NC mixture ratio. It was found that BFS fineness and NC ratio played a crucial role in the initial alkalinity of SS-BFS-based pastes. As such, lower BFS fineness and higher NC ratio can dramatically accelerate the formation of reaction products to endow higher mechanical strength of BFS-SS pastes. However, the effect of NC ratio on the microstructure development of BFS-SS based AAMs was more obvious than BFS fineness. |
| |
| Keywords: | blast-furnace slag compressive strength rheological behavior hydration products |
|
|
