Abstract

Due to its low porosity and high particle packing density, ultra-high-performance fiber reinforced concrete (UHPFRC) is a material with superb mechanical and durability properties in comparison with conventional and fiber-reinforced concretes. The addition of fibers to the matrix allows the development of adequate behavior to direct tension and bending. However, their main back drawn is its high initial cost and its high carbon footprint. To address those issues this research aims to analyze the behavior of a previously optimized eco-friendly recycled glass ultra-high-performance concrete under flexural stress by using locally available low-cost synthetic fiber reinforcement. Besides, high-strength steel fibers were used to establish a comparison. The experimental program involved 34 dosages of UHPFRC. The results showed that, contrary to what happens with the high strength fiber, no one of the synthetic series with 1% of fiber volume fraction achieved the deflection hardening condition. However, several synthetic fibers series achieved that condition with a 2% of fiber volume fraction. Furthermore, the results also showed that the polypropylene fibers, the polypropylene/polyethylene fibers, and the hybrid combination of PVA and polypropylene/polyethylene fibers, outperformed the high strength steel fibers regarding the cost-benefit analysis for the toughness of a UHPFRC with 2% total volume fiber.

摘要

由于其低孔隙率和高颗粒填充密度，超高性能纤维增强混凝土 (UHPFRC) 与传统和纤维增强混凝土相比，是一种具有卓越机械性能和耐久性能的材料。将纤维添加到基体中可以产生足够的行为来引导张力和弯曲。然而，它们的主要缺点是其高昂的初始成本和高碳足迹。为了解决这些问题，本研究旨在通过使用当地可用的低成本合成纤维增强材料来分析先前优化的环保再生玻璃超高性能混凝土在弯曲应力下的行为。此外，还使用了高强度钢纤维进行比较。实验计划涉及 34 剂 UHPFRC。结果表明，与高强度纤维的情况相反，纤维体积分数为 1% 的合成系列中没有一种达到挠曲硬化条件。然而，几个合成纤维系列以 2% 的纤维体积分数实现了这一条件。此外，结果还表明，在对 2% 的 UHPFRC 的韧性进行成本效益分析时，聚丙烯纤维、聚丙烯/聚乙烯纤维以及 PVA 和聚丙烯/聚乙烯纤维的混合组合优于高强度钢纤维。总体积纤维。