Wang Yunfeng, Jiang Bo, Su Ying, He Xingyang, Wang Yingbin, Oh Sangkeun
School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China.
School of Architecture, Seoul National University of Science and Technology, Seoul 01811, Korea.
Materials (Basel). 2022 Jun 21;15(13):4375. doi: 10.3390/ma15134375.
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 NaO 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.
就建筑领域的可持续发展而言，碱激活材料（AAMs）被视为波特兰水泥的替代胶凝材料。本研究旨在考察碳酸钠（NC）对活性高炉矿渣（BFS）-钢渣（SS）性能的影响，并考虑BFS的细度和NaO当量。通过流变行为和pH值变化研究水化过程。采用TG-DTG和XRD对水化物进行表征，利用SEM和MIP分析微观结构。结果表明，活性BFS-SS浆体的流变学特性与H-B模型拟合良好，且受BFS细度和NC掺量的影响。研究发现，BFS细度和NC掺量对基于SS-BFS的浆体初始碱度起着关键作用。因此，较低的BFS细度和较高的NC掺量可显著加速反应产物的形成，赋予BFS-SS浆体更高的机械强度。然而，NC掺量对基于BFS-SS的AAMs微观结构发展的影响比BFS细度更为明显。
