长江科学院院报 ›› 2024, Vol. 41 ›› Issue (4): 187-193.DOI: 10.11988/ckyyb.20221566

• 水工结构与材料 • 上一篇    下一篇

玄武岩-聚乙烯醇纤维对再生混凝土抗冻性能的影响

司政1,2, 田爽1, 皇甫秉辉3, 黄灵芝1, 杜晓奇1, 张飞跃4   

  1. 1.西安理工大学 水利水电学院, 西安 710048;
    2.西安理工大学 西北旱区生态水利工程国家重点实验室,西安 710048;
    3.四川水发勘测设计研究院有限公司,成都 610072 ;
    4.西安理工大学 三期建设管理处,西安 710048
  • 收稿日期:2022-11-21 修回日期:2023-03-01 出版日期:2024-04-01 发布日期:2024-04-11
  • 作者简介:司 政(1981-),男,湖北黄冈人,教授,博士,研究方向为水工混凝土材料性能研究。E-mail: sizheng@xaut.edu.cn
  • 基金资助:
    国家自然科学基金项目(51879217, 51409207, 51609200)

Influence of Basalt-Polyvinyl Alcohol Fiber on Frost Resistance of Recycled Concrete

SI Zheng1,2, TIAN Shuang1, HUANGFU Bing-hui3, HUANG Ling-zhi1, DU Xiao-qi1, ZHANG Fei-yue4   

  1. 1. School of Water Resources and Hydropower, Xi'an University of Technology, Xi'an 710048, China;
    2. State Key Laboratory of Ecological Water Conservancy Engineering in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China;
    3. Sichuan Water Resources and Hydropower Survey, Design and Research Institute Co., Ltd., Chengdu 610072, China;
    4. Construction Management Office of the Third Phase of Xi'an University of Technology, Xi'an 710048, China
  • Received:2022-11-21 Revised:2023-03-01 Online:2024-04-01 Published:2024-04-11

摘要: 为了推广再生混凝土在高海拔和北方寒冷地区的应用,对单掺、混掺不同体积掺量玄武岩纤维和聚乙烯醇纤维的再生混凝土进行质量损失率、相对动弹性模量、抗压强度损失率3项抗冻性能指标的探究,并用SEM对200次冻融循环后混掺纤维再生混凝土进行细观作用机理分析,最后结合响应面法对混掺纤维掺量进行优选。结果显示:外掺纤维能够提高再生混凝土的抗冻性能,而混掺纤维效果优于单掺纤维;2种纤维在试件内部呈网状分布,协同受力,与基体互相约束,很大程度限制了裂缝的扩展和数量;纤维优化结果显示当聚乙烯醇纤维与玄武岩体积掺量分别为0.170%和0.246%时,再生混凝土的抗冻性能最优。研究成果对玄武岩-聚乙烯醇纤维再生混凝土纤维掺量设计具有一定的借鉴意义。

关键词: 再生混凝土, 混掺纤维, 纤维掺量优选, 冻融循环, 响应面法

Abstract: To enhance the utilization of recycled aggregate concrete (RAC) in high-altitude and cold regions of northern China, we investigated three anti-freezing performance indicators, namely, mass loss rate (MLR), relative dynamic elastic modulus (RDEM), and compressive strength loss rate (CSLR) of RAC reinforced with single and combined basalt fiber (BF) and polyvinyl alcohol fiber (PVAF). Scanning electron microscopy (SEM) was employed to analyze the meso-mechanical behavior of the mixed-fiber recycled concrete following 200 freeze-thaw cycles. Subsequently, the optimal mixed fiber content was determined using the response surface method. Findings indicate that fiber additives enhance the frost resistance of recycled concrete, with the combined fiber exhibiting superior performance compared to single fiber. Both BF and PVAF are intricately interwoven within the specimen's network, synergistically reinforcing the structure while mitigating crack formation. Optimization analysis reveals that the optimal volume content of PVAF and BF is 0.170% and 0.246%, respectively, yielding the highest frost resistance in recycled concrete. These results offer valuable insights for the design of basalt-polyvinyl alcohol fiber content in recycled concrete applications.

Key words: recycled concrete, mixed fiber, optimized fiber content, freeze-thaw cycle, response surface method

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