Bond and cracking behavior of tailored limestone calcined clay cement-based composites including bicomponent polypropylene fibers with enhanced mechanical interlocking

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2024-10-23 DOI:10.1016/j.cemconcomp.2024.105812
Mihaela-Monica Popa , Cesare Signorini , Mirza A.B. Beigh , Ahmad Chihadeh , Markus Stommel , Michael Kaliske , Viktor Mechtcherine , Christina Scheffler
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Abstract

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.
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包括双组分聚丙烯纤维的定制石灰石煅烧粘土水泥基复合材料的粘结和开裂行为,具有更强的机械互锁性
本研究探讨了将定制粘结剂配方与工程聚丙烯(PP)纤维相结合,开发一系列具有更强延展性和应变硬化特性的纤维增强水泥基(FRC)系统的潜力,同时兼顾可持续性和经济可行性。实验研究比较了使用试验纤维纺丝装置生产的新型双组分聚丙烯纤维与标准聚丙烯纤维的表面微观结构。进行了微尺度单纤维拉出试验,以确定这种表面改性在多大程度上有助于增强能量吸收。在将这些新型纤维嵌入两种石灰石煅烧粘土水泥(LC3)粘结剂体系时,对其在复合材料中的有效性进行了评估,评估结果显示,在水泥含量较低(占粘结剂总量的 35%)的情况下,FRLC3 的新鲜和硬化性能都很好。评估了加入超强吸水聚合物(SAP)对调整基质内部孔隙率的影响,从而提高了通过多种裂缝途径进行应力传递的可能性。通过有限元法(FEM)分析,并根据实验中获得的材料和粘结规律进行校准,模拟了本研究中最佳材料组合的拉伸和开裂行为,结果表明与拉伸试验高度相关。
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来源期刊
Cement & concrete composites
Cement & concrete composites 工程技术-材料科学:复合
CiteScore
18.70
自引率
11.40%
发文量
459
审稿时长
65 days
期刊介绍: Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
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