Valdés-Vidal Gonzalo, Calabi-Floody Alejandra, Duarte-Nass Carla, Mignolet Cristian, Díaz Cristian
Department of Civil Engineering, Universidad de La Frontera, Temuco 4811230, Chile.
CDI-Centro de Desarrollo e Investigación, Maipú 9260061, Chile.
Polymers (Basel). 2022 Aug 10;14(16):3250. doi: 10.3390/polym14163250.
End-of-life tires (ELT) are a worldwide problem. Rubber, steel, and different textile fibers are the by-products of ELT. Unlike rubber and steel, waste tire textile fibers (WTTF) are disposed of in landfills or burned. This study developed an additive made with WTTF to be incorporated into conventional hot mix asphalt (HMA), and its performance properties were evaluated. First, a characterization of the WTTF used was made and a manufacture protocol was established. Then, a reference HMA was designed and mixtures with different addition percentages (2%, 5% and 8%) of the WTTF-based additive were evaluated. The mechanical properties studied were stiffness modulus, moisture susceptibility, rutting resistance, stripping, and cracking resistance. The results indicated that the addition of the 2% and 5% WTTF-based additive improved these performance properties. Moreover, all addition percentages of the WTTF-based additive evaluated demonstrated a decrease of over 29% in permanent deformation according to the Hamburg Wheel Tracking Test. Thus, the use of the WTTF would not only be valuing a waste, but an asphalt mixture with improved properties would be obtained, contributing to the circular economy by reusing a material and prolonging the useful life of the asphalt mixture.
废旧轮胎是一个全球性问题。橡胶、钢铁和不同的纺织纤维是废旧轮胎的副产品。与橡胶和钢铁不同，废旧轮胎纺织纤维被丢弃在垃圾填埋场或被焚烧。本研究开发了一种由废旧轮胎纺织纤维制成的添加剂，将其掺入传统热拌沥青（HMA）中，并对其性能进行了评估。首先，对所用的废旧轮胎纺织纤维进行了表征，并制定了制造方案。然后，设计了一种参考热拌沥青，并对含有不同添加比例（2%、5%和8%）的基于废旧轮胎纺织纤维的添加剂的混合料进行了评估。所研究的力学性能包括刚度模量、水敏感性、抗车辙性、剥落和抗裂性。结果表明，添加2%和5%的基于废旧轮胎纺织纤维的添加剂改善了这些性能。此外，根据汉堡轮辙试验，所评估的基于废旧轮胎纺织纤维的添加剂的所有添加比例均使永久变形降低了29%以上。因此，使用废旧轮胎纺织纤维不仅可以使一种废物得到利用，还可以获得性能得到改善的沥青混合料，通过材料再利用和延长沥青混合料的使用寿命为循环经济做出贡献。
