Valdes-Vidal Gonzalo, Calabi-Floody Alejandra, Mignolet-Garrido Cristian, Bravo-Espinoza Cristobal
Department of Civil Engineering, Universidad de La Frontera, Temuco 4811230, Chile.
GiPAV-Grupo de Investigación en Pavimentación Vial, Temuco 4811230, Chile.
Polymers (Basel). 2024 Jan 30;16(3):385. doi: 10.3390/polym16030385.
Waste-tire textile fibers (WTTF) represent a challenge for the recycling industry since there are currently very few alternatives for their use. In this study, an evaluation of the effect of a new additive developed in two granular formats from WTTF on the fatigue behavior of asphalt mixtures was performed. For the first format of the WTTF-based additive, its effect was evaluated on hot-mix asphalt (HMA), while for the second format of the additive, the effects were evaluated on stone mastic asphalt (SMA). This second format represents an alternative that allows for the total replacement of the cellulose stabilizing additive used in the reference mix. The evaluation of fatigue damage in the mixes was performed using the four-point bending beam (4PB) test specified in European standard EN 12697-24. The test results show that the asphalt mixtures manufactured with WTTF-based additives exhibited a higher capacity to resist load cycles before failure compared to the reference mixtures. Likewise, once the asphalt mixtures were evaluated in a pavement structure by means of an empirical mechanistic analysis, the pavement structures composed of asphalt mixtures with WTTF-based additives showed significant improvements in their durability for the different load axes evaluated. For an average thickness of 15 cm of asphalt mix of a pavement-type structure, the use of the WTTF additive increases the durability of the structures by up to 129% and 112% compared to the HMA and SMA reference mixtures, respectively. These results show that both formats of the WTTF-based admixture improve the fatigue damage resistance of the HMA and SMA asphalt mixtures.
废轮胎纺织纤维（WTTF）对回收行业来说是一项挑战，因为目前其用途的替代方案非常少。在本研究中，对以两种颗粒形式由WTTF开发的新型添加剂对沥青混合料疲劳性能的影响进行了评估。对于第一种基于WTTF的添加剂形式，评估了其对热拌沥青（HMA）的影响，而对于第二种添加剂形式，评估了其对沥青玛蹄脂碎石混合料（SMA）的影响。第二种形式是一种替代方案，可完全替代参考混合料中使用的纤维素稳定添加剂。使用欧洲标准EN 12697 - 24规定的四点弯曲梁（4PB）试验对混合料中的疲劳损伤进行了评估。试验结果表明，与参考混合料相比，用基于WTTF的添加剂制造的沥青混合料在破坏前表现出更高的抵抗荷载循环的能力。同样，一旦通过经验力学分析在路面结构中对沥青混合料进行评估，由含基于WTTF添加剂的沥青混合料组成的路面结构在评估的不同荷载轴上其耐久性有显著提高。对于路面型结构平均厚度为15厘米的沥青混合料，与HMA和SMA参考混合料相比，使用WTTF添加剂分别使结构的耐久性提高了129%和112%。这些结果表明，两种形式的基于WTTF的外加剂均提高了HMA和SMA沥青混合料的抗疲劳损伤能力。
