Obukhova Svetlana, Budkina Angelina, Korolev Evgeny, Gladkikh Vitaly
Department of Urban Planning, Institute of Architecture and Urban Planning, National Research Moscow State University of Civil Engineering, Moscow 129337, Russia.
Scientific and Educational Center "Nanomaterials and Nanotechnologies", National Research Moscow State University of Civil Engineering, Moscow 129337, Russia.
Materials (Basel). 2024 Oct 18;17(20):5091. doi: 10.3390/ma17205091.
The issue of forming a reliable and stable structure of a crumb-rubber-modified binder is an important scientific and technical task. The authors supplemented existing concepts of the mechanism of effective interaction with rubber crumb by introducing a preliminary first stage: controlled partial physical destruction of rubber crumb-producing rubber reclaim. Proposed physical methods of rubber crumb destruction include high shear force (roll mills), high temperature, and a plasticizing medium. The controllability and degree of devulcanization of rubber were determined by acetone-chloroform extraction in different time intervals. The degree of devulcanization of rubber in the rubber reclaim was found to be 22 ± 0.24%, with stability over 14 days. It was found that the size of the particles of the rubber reclaim in the bitumen is less than 2 µm. The properties of the structure of the binder modified with rubber reclaim, characterizing the stability and sustainability, have been studied and established. The developed modified binders are stable in storage. Rheological parameters of the structure characterizing intermolecular interaction, such as shear stability for original and RTFOT-aged, modified bitumen, meet requirements of the state standard at test temperature 64 °C. The elastic structural component of the crumb-rubber-modified binder, as indicated by the relative irreversible deformation parameter , does not exceed 2.6 kPa (<4.5 kPa) at 64 °C. Additionally, it was determined that the rheological structural parameter for fatigue resistance, which characterizes the durability of road pavement under intensive operational conditions, does not exceed 4699 kPa (<5000 kPa) at 16 °C. The use of 10% rubber reclaim combined with waste frying oil provided the opportunity to obtain a modified binder with a stable and sustainable structure without the introduction of additional stabilizers and agents. Test results showed that the overall performance characteristics of the modified binder meet the 64(S)-40 grade standards.
形成橡胶颗粒改性粘结剂可靠且稳定结构的问题是一项重要的科学技术任务。作者通过引入初步的第一阶段：对橡胶颗粒进行可控的部分物理破坏以产生再生橡胶，补充了与橡胶颗粒有效相互作用机理的现有概念。提出的橡胶颗粒破坏物理方法包括高剪切力（辊磨机）、高温和增塑介质。通过在不同时间间隔进行丙酮 - 氯仿萃取来确定橡胶的可控性和脱硫程度。发现再生橡胶中橡胶的脱硫程度为22±0.24%，且在14天内保持稳定。发现沥青中再生橡胶颗粒的尺寸小于2μm。对用再生橡胶改性的粘结剂结构的性能进行了研究和确定，这些性能表征了稳定性和可持续性。所开发的改性粘结剂在储存中稳定。表征分子间相互作用的结构流变参数，如原始和经RTFOT老化的改性沥青的剪切稳定性，在测试温度64°C时符合国家标准要求。由相对不可逆变形参数表明的橡胶颗粒改性粘结剂的弹性结构成分，在64°C时不超过2.6kPa（<4.5kPa）。此外，确定了表征在密集运行条件下道路路面耐久性的抗疲劳流变性结构参数，在16°C时不超过4699kPa（<5000kPa）。使用10%的再生橡胶与废煎炸油相结合，无需引入额外的稳定剂和添加剂，就有机会获得具有稳定且可持续结构的改性粘结剂。测试结果表明，改性粘结剂的整体性能特征符合64(S)-40级标准。
