Herz Jonas, Muscat Dirk, Strübbe Nicole
Faculty of Engineering Sciences, Rosenheim Technical University of Applied Sciences, Hochschulstraße 1, 83024 Rosenheim, Germany.
Polymers (Basel). 2025 Jun 27;17(13):1781. doi: 10.3390/polym17131781.
Noncorrosive concrete reinforcement, such as polymer fibers, is needed to overcome the current issues caused by corroded steel reinforcements. Fibers made of polypropylene show a low bonding behavior in concrete. Fillers can help to overcome this issue but often lead to reduced mechanical properties. Core-shell fibers, which split the mechanical properties and the bonding behavior between the core and the shell component, could be a solution. This study investigates mono-material and core-shell fibers produced with calcium carbonate and bentonite fillers and compares their behavior in tensile tests, density measurements, contact angle measurements, topography measurements, single fiber pull-out tests, reflected light microscopy, and thermogravimetric analysis. The fillers caused an increased drawability, resulting in higher mechanical properties. Further, in the core-shell fibers, the calcium carbonate increased the surface roughness, which led to a better anchoring of the fiber in concrete, which was also visible in the deformation during pull-out observed in reflected light microscopy pictures. The thermogravimetric analysis showed a delay in onset of degradation for fibers containing bentonite.
需要使用非腐蚀性混凝土增强材料，如聚合物纤维，来克服当前由锈蚀钢筋引起的问题。聚丙烯制成的纤维在混凝土中表现出较低的粘结性能。填料有助于克服这一问题，但往往会导致机械性能下降。核壳纤维将机械性能和核与壳组分之间的粘结行为分开，可能是一种解决方案。本研究调查了用碳酸钙和膨润土填料生产的单材料纤维和核壳纤维，并在拉伸试验、密度测量、接触角测量、形貌测量、单纤维拔出试验、反射光显微镜和热重分析中比较了它们的性能。填料提高了纤维的拉伸性，从而产生了更高的机械性能。此外，在核壳纤维中，碳酸钙增加了表面粗糙度，这导致纤维在混凝土中的锚固更好，这在反射光显微镜照片中观察到的拔出过程中的变形中也很明显。热重分析表明，含膨润土纤维的降解起始有所延迟。
