This work focuses on studying the alkali-activated fiber reinforced composites (AAFRCs) with steel slag (SS) as a precursor material. Apart from finding a sustainable way to reuse the enormous amount of industrial by-product SS, it is also the aim to develop material systems with excellent ductility that may be used in a variety of applications. Using SS as a partial replacement (0%–25%) for fly ash (FA) and ground granulated blast-furnace slag (GGBS), the influence on the alkaline activated system was carefully studied. Tensile and compressive properties of the composites were tested. Cracking characteristics under tensile tests were carefully analyzed. Meso-scale studies were performed, including three-point bending test and single crack tensile test, aiming to understand the mechanisms of the high ductility. Scanning electron microscopy (SEM) was adopted to study the microstructure. Based on the results of the mechanical properties, the optimum mix is with 15% SS replacement, where the tensile strength, tensile strain capacity and the compressive strength are 4.86 MPa, 3.94% and 93 MPa, respectively. SS replacement ratio higher than 15% leads to the deterioration of all the studied mechanical properties. The SS replacement has limited impact on the cracking characteristics of the concerned composite system. The results of the meso-scale studies help to explain the mechanism(s) accounting for the high ductility of the studied mixes. Especially, the influence of the SS replacement on the tensile strain capacity of the studied system is well reflected by the energy index. The SS replacement with a ratio of 15% showed no significant impact on the microstructure in comparison with that of the control mix, while it appears that the SS replacement modifies (weakens) the fiber-matrix interfacial bonding to some extent, leading to the improvement of the ductility.

这项工作的重点是研究以钢渣（SS）为前体材料的碱活化纤维增强复合材料（AAFRCs）。除了找到一种可持续的方式来重复利用大量的工业副产品SS之外，它的目标还在于开发具有出色延展性的材料系统，该系统可用于多种应用。使用SS作为粉煤灰（FA）和磨碎的高炉矿渣（GGBS）的部分替代品（0％–25％），仔细研究了对碱活化系统的影响。测试了复合材料的拉伸和压缩性能。仔细分析了拉伸试验下的开裂特性。进行了中尺度研究，包括三点弯曲试验和单裂纹拉伸试验，旨在了解高延展性的机理。采用扫描电子显微镜（SEM）研究其微观结构。根据机械性能的结果，最佳混合料是15％SS替代，其抗拉强度，拉伸应变能力和抗压强度分别为4.86 MPa，3.94％和93 MPa。SS替换率高于15％会导致所有研究的机械性能下降。SS的更换对相关复合系统的裂化特性影响有限。中尺度研究的结果有助于解释导致所研究混合物具有高延展性的机理。特别是，SS替代对所研究系统的拉伸应变能力的影响已通过能量指数很好地反映出来。