An experimental investigation was performed to study the benefits of partially replacing ordinary Portland cement with pozzolanic material on the fresh and hardened characteristics of high-strength self-compacting (HSSC) cementitious composite reinforced by randomly distributed wavy steel fiber. The four wavy fiber volume fractions (0.25%, 0.50%, 0.75%, and 1%) and silica fume contents of 5 and 15 wt% (wt%) of cement were investigated. A total of fifteen mixtures, including different combinations of the fiber and silica fume, were designed and assessed in terms of the passing ability, water absorption, tensile, compressive, flexural, and impact tests. The energy-dispersive X-ray microanalysis (EDX) was applied to specify the cementitious matrix's chemical compositions quantitatively. Moreover, the wavy fiber’s surface topography in the nano-metric scale was specified using an atomic force microscope. The results reveal that the patterns of cracks, impact energy at first crack and failure mechanism, increment in the number of blows after first-cracks, flexural strength, and splitting tensile behavior of mixtures were greatly influenced by adding wavy steel fibers. It was also found that the improvement in toughness and post-peak behavior of HSSC cementitious composites was appreciably governed by the bridging effect of fibers and an increase in bonding strength of interfacial transition zone between fine aggregate and cement paste due to an increase in the content of silica fume. The benefit of the present investigation is to better understand the failure performance of fibrous self-compacting composites.

进行了实验研究，以研究用火山灰材料部分替代普通波特兰水泥对随机分布的波浪形钢纤维增强的高强度自密实（HSSC）胶凝复合材料的新鲜和硬化特性的好处。研究了四个波浪状纤维的体积分数（0.25％，0.50％，0.75％和1％）和硅灰含量分别为5和15 wt％（wt％）的水泥。设计了总共15种混合物，包括纤维和硅粉的不同组合，并通过了通过能力，吸水率，拉伸，压缩，弯曲和冲击测试。应用能量色散X射线微分析（EDX）定量确定胶结基质的化学组成。而且，使用原子力显微镜确定了纳米尺度的波浪状纤维的表面形貌。结果表明，添加波浪形钢纤维对裂纹的形态，第一次裂纹的冲击能和破坏机理，第一次裂纹后的吹动次数的增加，弯曲强度和劈裂拉伸性能的影响很大。还发现，HSSC胶凝复合材料的韧性和峰后性能的改善明显地受到纤维的桥连作用和细骨料与水泥浆之间界面过渡区结合强度的增加（由于含量的增加）的控制。硅粉。本研究的好处是可以更好地了解纤维自密实复合材料的破坏性能。