| 摘要: |
| 为改善橡胶混凝土的力学性能，以纳米SiO2为改性剂，研究了纳米SiO2增强橡胶混凝土的断裂行为，采用数字图像相关方法，分析了纳米SiO2增强橡胶混凝土断裂性能，并结合微观结构分析探讨了其增强机理.结果表明：纳米SiO2的掺入对橡胶混凝土的断裂性能和强度提高效果显著；纳米SiO2与橡胶的协同作用提高了混凝土裂缝扩展稳定性，延长了断裂过程起裂到失稳的时间；纳米SiO2对橡胶混凝土断裂性能的提升归结于其对水泥基质的改善，从而提高了混凝土的承载能力. |
| 关键词: 橡胶混凝土 纳米SiO2 强度 断裂性能 数字图像相关方法 |
| DOI：10.3969/j.issn.1007-9629.2023.07.005 |
| 分类号:TU528.57 |
| 基金项目:长江科学院开放研究基金资助项目（CKWV2017517/KY）； 国家自然科学基金资助项目（52179145）； 河南省高校科技创新人才支持计划（21HASTIT013）； 河南省自然科学基金优秀青年基金资助项目（222300420081）； 水沙科学与水利水电工程国家重点实验室开放基金资助项目（sklhse-2022-C-01） |
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| Effect of Nano-SiO2 on Fracture Behavior of Rubber Concrete |
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WANG Juan1,2, WANG Wenchao1, XU Yaoqun1, CAO Hongliang3, WANG Dahui3
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1.Laboratory of Yellow River， Zhengzhou University， Zhengzhou 450001， China;2.State Key Laboratory of Hydroscience and Engineering， Tsinghua University， Beijing 100084， China;3.Institute of Structural Materials Research， Henan Provincial Water Conservancy Research Institute， Zhengzhou 450003， China
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| Abstract: |
| In order to improve the mechanical properties of rubber concrete， nano-SiO2 was used as a modifier to study the fracture behavior of nano-SiO2 reinforced rubber concrete. Digital image correlation technology was used to analyze the fracture performance of nano-SiO2 reinforced rubber concrete， and its strengthening mechanism was explored through microstructure analysis. The results show that with the incorporation of nano-SiO2， the fracture performance and strength of rubber concrete are improved significantly. The incorporation of nano-SiO2 and rubber can improve the stability of concrete crack expansion and prolong the time from cracking to instability during the fracture process. The improvement of the fracture performance of rubber concrete by nano-SiO2 is attributed to its improvement in the cement matrix， thereby enhancing the bearing capacity of concrete. |
| Key words: rubber concrete nano-SiO2 strength fracture performance digital image correlation |
