The coupling effects of steel slag powder (SSP) and electromagnetic waves on hydration kinetics and microstructure evolution of ultra low water/binder ratio cementitious materials (ULWC-SSP) is clarified in this research. More precisely, a dense matrix skeleton with appropriate content of SSP is designed first of all by the D-optimal design (DOD). After that, the ULWC-SSP samples are subjected to the electromagnetic waves environment for 0–4 min. Finally, the coupling effects of SSP and electromagnetic waves on the macroscopic and microscopic performances are evaluated. The obtained results show that the amount of early C–S–H gels of samples cured by electromagnetic waves for 1–4 min increases from 28.63% to 31.71%. At the same time, SSP can be used as a local heat source and electromagnetic shield to improve the interfacial transition zone (ITZ) under the treatment of electromagnetic waves. Therefore, based on an optimal curing regime, the macro and micro properties of the developed sustainable ultra low water/binder ratio cementitious materials can be advanced.

本研究阐明了钢渣粉（SSP）和电磁波对超低水胶比胶凝材料（ULWC-SSP）水化动力学和微观结构演化的耦合作用。更准确地说，具有适当 SSP 含量的密集矩阵骨架首先通过 D 最优设计 (DOD) 设计。之后，将 ULWC-SSP 样品置于电磁波环境中 0-4 分钟。最后，评估了 SSP 和电磁波对宏观和微观性能的耦合效应。所得结果表明，电磁波固化 1-4 min 样品的早期 C-S-H 凝胶量从 28.63% 增加到 31.71%。同时，SSP可用作局部热源和电磁屏蔽，以改善电磁波处理下的界面过渡区（ITZ）。因此，基于最佳固化方案，可以提高开发的可持续超低水胶比胶凝材料的宏观和微观性能。