东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (2): 111-117.DOI: 10.12068/j.issn.1005-3026.2025.20230227

• 资源与土木工程 • 上一篇    

聚丙烯纤维混凝土高温传热性能多尺度计算模型

陈猛, 杨新明, 王瑜婷, 张通()   

  1. 东北大学 资源与土木工程学院,辽宁 沈阳 110819
  • 收稿日期:2023-07-31 出版日期:2025-02-15 发布日期:2025-05-20
  • 通讯作者: 张通
  • 作者简介:陈 猛(1981—),男,辽宁开原人,东北大学教授.
  • 基金资助:
    国家自然科学基金资助项目(52178382);中央高校基本科研业务费专项资金资助项目(N2201023);中国博士后科学基金资助项目(2023M730526);辽宁省博士科研启动基金资助项目(2023-BS-058)

Multiscale Calculation Model for High Temperature Heat Transfer Property of Polypropylene Fiber Reinforced Concrete

Meng CHEN, Xin-ming YANG, Yu-ting WANG, Tong ZHANG()   

  1. School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China.
  • Received:2023-07-31 Online:2025-02-15 Published:2025-05-20
  • Contact: Tong ZHANG

摘要:

聚丙烯纤维被广泛应用于高性能水泥基材料中以减轻结构的高温损伤,但是其高温传热参数的计算与预测仍缺乏有效的模型.基于复合材料均一化方法,提出了聚丙烯纤维混凝土高温传热性能的精细化多尺度计算模型,充分考虑了聚丙烯纤维高温下的体积变化以及纤维熔化后的松弛效应对混凝土导热系数的影响.基于试验结果的验证可知,提出的计算模型可以很好地预测聚丙烯纤维混凝土高温下的传热性能.此外,通过模型参数敏感性分析,发现聚丙烯纤维的传热性能和纤维形状对等效导热系数的影响不大,而纤维掺量是影响等效导热系数的主要因素.分析结果对于纤维混凝土的传热性能设计有一定的参考价值.

关键词: 纤维混凝土, 传热性能, 高温, 均一化方法, 松弛效应

Abstract:

Polypropylene fibers are widely used in high-performance cement-based materials to reduce the high-temperature damage of structures. However, the calculation and prediction of thermal transfer parameters for polypropylene fiber reinforced concrete at high temperature still lack an effective model. Based on the homogenization method of composite materials, a refined multiscale calculation model was proposed to estimate the equivalent thermal conductivity of polypropylene fiber reinforced concrete at high temperature, which fully considered the influence of the volume change of polypropylene fiber at high temperature and the relaxation effect after fiber melting. As verified by experimental results, the proposed calculation model can accurately predict the thermal conductivity of polypropylene fiber reinforced concrete as a function of temperature. In addition, the thermal transfer properties and shape of polypropylene fiber have little effect on the equivalent thermal conductivity, while the fiber content is the main influence factor through model parameter sensitivity analysis. The analysis results provide a reference for the thermal design of fiber reinforced concrete.

Key words: fiber reinforced concrete, heat transfer properties, high temperature, homogenization method, relaxation effect

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