对废橡胶颗粒进行高温搅拌预处理可增强橡胶混凝土的界面粘结性和力学性能

Yuan Jing, Chunwei Zhang, Ali Arab, Guangyi Lin, Meng Zhao
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摘要

本文创新性地提出了一种180 ℃高温搅拌预处理废橡胶颗粒的方法,并将该方法与未处理、NaOH处理和硅烷偶联剂KH570处理的废橡胶颗粒进行了比较。采用傅立叶变换红外光谱、X 射线衍射分析、水接触角测量、扫描电子显微镜和能量色散 X 射线研究了不同预处理方法对废橡胶颗粒的影响和机理。结果表明,与经过 NaOH 处理和 KH570 处理的废橡胶颗粒相比,经过 180 °C 高温搅拌预处理的废橡胶颗粒的清洁度明显提高,并形成了坚硬的氧化膜。研究还探讨了不同预处理方法对利用预处理废橡胶颗粒制备的橡胶混凝土的力学性能和界面结合性能的影响。结果表明,使用 180 °C 高温搅拌的预处理废橡胶颗粒代替 20% 的细骨料制备的橡胶混凝土具有最佳的力学性能和界面粘结性能。7 天和 28 天后的抗压强度恢复率分别为 41.6% 和 37.3%;劈裂拉伸强度恢复率分别为 47.3% 和 60.6%;轴向抗压强度恢复率分别为 34.1% 和 18.8%;静态压缩弹性模量恢复率分别为 46.8% 和 26.3%。废橡胶颗粒的高温搅拌预处理操作简单,适合规模化生产。其预处理效果优于 KH570 法和 NaOH 法,为废橡胶颗粒替代橡胶混凝土细骨料的规模化应用提供了参考价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High-Temperature Stirring Pretreatment of Waste Rubber Particles Enhances the Interfacial Bonding and Mechanical Properties of Rubberized Concrete
This paper innovatively proposes a method of 180 °C high-temperature stirring pretreatment for waste rubber particles and compares this method with untreated, NaOH-treated, and silane coupling agent KH570-treated waste rubber particles. Fourier-transform infrared spectroscopy, X-ray diffraction analysis, water contact angle measurement, scanning electron microscopy, and energy-dispersive X-ray study are used to investigate the effects and mechanisms of different pretreatment methods on waste rubber particles. The results indicate that compared to NaOH-treated and KH570-treated waste rubber particles, the 180 °C high-temperature-stirred pretreated waste rubber particles show significantly improved cleanliness and form a hard oxide film. The study also investigates the effects of different pretreatment methods on the mechanical properties and interface binding performance of rubber concrete made from pretreated waste rubber particles. The results demonstrate that rubber concrete prepared using 180 °C high-temperature-stirred pretreated waste rubber particles substituting 20% fine aggregate exhibits the best mechanical properties and interface bonding performance. The compressive strength recovery rates after 7 and 28 days are 41.6% and 37.3%, respectively; the split tensile strength recovery rates are 47.3% and 60.6%; the axial compressive strength recovery rates are 34.1% and 18.8%; and the static compression moduli of elasticity recovery rates are 46.8% and 26.3%. High-temperature stirring pretreatment of waste rubber particles is simple to operate and suitable for scaled production. Its pretreatment effect is superior to those of the KH570 and NaOH methods, providing a reference value for the scalable application of waste rubber particles as a substitute for fine aggregate in rubber concrete.
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