潘文佳,邓世杰,瞿福林,张曼,任娟娟

• 1:西南交通大学高速铁路线路工程教育部重点实验室
• 2:西南交通大学土木工程学院

摘要(Abstract)：

针对废旧橡胶颗粒表面强疏水性导致的无砟轨道自密实混凝土水泥基体黏结界面薄弱、混凝土强度显著下降等缺陷，旨在通过优化表面包覆改性工艺提升轨道结构的耐久性与承载能力。采用NaOH、硅烷偶联剂(KH550、KH570)和纳米SiO_2及其组合方式对橡胶颗粒进行表面改性，将改性后的橡胶颗粒按照砂体积10%的比例替代砂掺入无砟轨道自密实混凝土砂浆中。探究不同方式下改性橡胶的外貌和微观结构，并对砂浆的力学性能、毛细吸水性、黏结界面进行研究。结果表明：KH550硅烷与纳米SiO_2共同改性(R@S550)方式下，硅烷烷氧基水解生成的硅羟基与纳米SiO_2表面羟基缩合形成了最显著的Si—O—Si键，其表面的纳米SiO_2包覆量最多且物理脱落稳定性最好。在宏观力学性能方面，其对应的砂浆M-R@S550与未处理橡胶砂浆(M-R)相比抗压强度上升12.1%,其28 d抗压强度达到40 MPa以上；同时，由于橡胶骨料本身良好的疏水效应，该组砂浆与基准砂浆(M-JZ)相比吸水性下降30.0%。在微观结构下观察到M-R@S550薄弱界面过渡区(ITZ)最大宽度和平均宽度分别比M-R组下降53.88%和83.9%,薄弱界面的黏结密实度与弱界面力学行为得到增强。

关键词(KeyWords)： 无砟轨道;自密实混凝土砂浆;纳米SiO_2改性橡胶;抗压强度;毛细吸水性;微观界面

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52425213)

作者(Author): 潘文佳,邓世杰,瞿福林,张曼,任娟娟

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