Michalik Agnieszka, Chyliński Filip, Zychowicz Jacek, Pichór Waldemar
Building Structures, Geotechnics and Concrete Department, Building Research Institute, ul. Filtrowa 1, 00-611 Warsaw, Poland.
Faculty of Civil Engineering and Geodesy, Military University of Technology, ul. gen. Sylwestra Kaliskiego 2, 00-908 Warsaw, Poland.
Materials (Basel). 2024 Sep 17;17(18):4554. doi: 10.3390/ma17184554.
This research was conducted to analyse the possibility of using raw, untreated recycled tyre fibres as an effective concrete reinforcement according to circular economy principles. The aim of the article was also to develop a method for dispensing tire fibres on a real scale. Additional treatment and homogenisation of recycled steel fibres entail higher energy consumption, emissions of greenhouse gases, and increased costs. However, obtaining durable and safe concrete effectively reinforced with steel fibres is critical. Finding a balance between environmental friendliness and product durability is a circular economic challenge. Reference concrete with commercial steel fibres (15 kg/m) and two concretes containing various quantities of non-treated, raw tyre recycled fibres (25 kg/m and 45 kg/m) were industrially produced. Tests were carried out on the properties of the concrete mixture and hardened concrete, such as compressive strength, flexural strength, splitting strength, modulus of elasticity, residual flexural tensile strength, and fibre distribution in concrete. Tests revealed that increasing the amount of raw tyre fibres disturbs the structure and causes air entrainment and the formation of fibre clusters. Smaller quantities of raw tyre fibres turn out an effective concrete reinforcement. The use of non-treated tyre fibres as concrete reinforcement is possible but requires more stringent control of the concrete parameters. Implementation tests on an industrial scale are a novelty in this study, presenting an analysis of the possible dispensing of tyre fibres in a ready-mixed concrete production plant and testing the characteristics of manufactured concrete.
本研究旨在根据循环经济原则，分析使用未经处理的废旧轮胎纤维作为混凝土有效增强材料的可能性。本文的目的还在于开发一种在实际规模上投放轮胎纤维的方法。对再生钢纤维进行额外处理和均匀化会带来更高的能源消耗、温室气体排放以及成本增加。然而，获得用钢纤维有效增强的耐用且安全的混凝土至关重要。在环境友好性与产品耐久性之间找到平衡是循环经济面临的一项挑战。工业生产了含商业钢纤维（15千克/立方米）的参考混凝土以及两种含有不同数量未经处理的废旧轮胎再生纤维（25千克/立方米和45千克/立方米）的混凝土。对混凝土混合物和硬化混凝土的性能进行了测试，如抗压强度、抗弯强度、劈裂强度、弹性模量、残余抗弯抗拉强度以及纤维在混凝土中的分布。测试表明，增加废旧轮胎纤维的用量会扰乱结构并导致引气以及纤维簇的形成。较少量的废旧轮胎纤维证明是混凝土的有效增强材料。使用未经处理的轮胎纤维作为混凝土增强材料是可行的，但需要对混凝土参数进行更严格的控制。在工业规模上进行实施测试是本研究的一个创新点，它对在预拌混凝土生产厂中投放轮胎纤维的可能性进行了分析，并测试了制成混凝土的特性。
