纳米SiO_(2)对橡胶混凝土断裂行为的影响  

Effect of Nano-SiO_(2)on Fracture Behavior of Rubber Concrete

作　　者：王娟[1,2] 王文超[1] 许耀群 曹宏亮 王大辉 WANG Juan;WANG Wenchao;XU Yaoqun;CAO Hongliang;WANG Dahui(Laboratory of Yellow River,Zhengzhou University,Zhengzhou 450001,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;Institute of Structural Materials Research,Henan Provincial Water Conservancy Research Institute,Zhengzhou 450003,China)

机构地区：[1]郑州大学黄河实验室,河南郑州450001 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [3]河南省水利科学研究院结构材料研究所,河南郑州450003

出　　处：《建筑材料学报》2023年第7期731-738,共8页Journal of Building Materials

基　　金：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)。

摘　　要：为改善橡胶混凝土的力学性能,以纳米SiO_(2)为改性剂,研究了纳米SiO_(2)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SiO_(2)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SiO_(2)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SiO_(2)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SiO_(2)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.In order to improve the mechanical properties of rubber concrete,nano-SiO_(2)was used as a modifier to study the fracture behavior of nano-SiO_(2)reinforced rubber concrete.Digital image correlation technology was used to analyze the fracture performance of nano-SiO_(2)reinforced rubber concrete,and its strengthening mechanism was explored through microstructure analysis.The results show that with the incorporation of nano-SiO_(2),the fracture performance and strength of rubber concrete are improved significantly.The incorporation of nano-SiO_(2)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-SiO_(2)is attributed to its improvement in the cement matrix,thereby enhancing the bearing capacity of concrete.

关 键 词：橡胶混凝土 纳米SiO_(2) 强度 断裂性能 数字图像相关方法 

分 类 号：TU528.57[建筑科学—建筑技术科学]