This study examines the potential of combining tailored binder formulations with engineered polypropylene (PP) fibers to develop a range of Fiber-Reinforced Cementitious (FRC) systems with enhanced ductility and strain-hardening properties, while encompassing sustainability and economic viability. The experimental investigation compares the surface microstructure of novel bicomponent PP fibers, produced using a pilot fiber spinning device, with that of standard PP fibers. Micro-scale single-fiber pull-out tests are conducted to ascertain the extent to which this surface modification contributes to enhanced energy absorption. The effectiveness of these novel fibers at the composite scale is assessed when embedded into two limestone calcined clay cement (LC3) binder systems, in terms of the fresh and hardened properties of the resulting FRLC3, with low cement content (35 % of the total binder). The effect of incorporating super absorbent polymer (SAP) on tailoring the internal porosity of the matrix, thereby promoting the potential for stress transfer via multiple crack pathways, is assessed. A Finite Element Method (FEM) analysis, calibrated with the materials and bond laws retrieved experimentally, is conducted to simulate the tensile and cracking behavior of the optimal material combination investigated in this study, demonstrating a high degree of correlation with the tensile tests.

中文翻译：

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定制石灰石煅烧粘土水泥基复合材料的粘合和开裂行为，包括具有增强机械联锁的双组分聚丙烯纤维


本研究探讨了将定制粘合剂配方与工程聚丙烯 （PP） 纤维相结合的潜力，以开发一系列具有增强延展性和应变硬化性能的纤维增强水泥基 （FRC） 系统，同时涵盖可持续性和经济可行性。实验研究比较了使用中试纤维纺丝装置生产的新型双组分 PP 纤维与标准 PP 纤维的表面微观结构。进行微尺度单纤维拉出测试，以确定这种表面改性在多大程度上有助于增强能量吸收。当嵌入到两个石灰石煅烧粘土水泥 （LC3） 粘合剂系统中时，根据所得 FRLC3 的新鲜和硬化性能，评估这些新型纤维在复合尺度上的有效性，水泥含量低（占总粘合剂的 35%）。评估了加入高吸水性聚合物 （SAP） 对定制基体内部孔隙率的影响，从而促进通过多个裂纹路径传递应力的可能性。使用实验检索到的材料和粘合定律进行校准的有限元方法 （FEM） 分析，以模拟本研究中研究的最佳材料组合的拉伸和开裂行为，证明与拉伸测试高度相关。