A multiphase micromechanical model for hybrid fiber reinforced concrete considering the aggregate and ITZ effects
A multiphase micromechanical model for hybrid fiber reinforced concrete considering the aggregate and ITZ effects
复制标题
考虑骨料和 ITZ 效应的混合纤维混凝土多相微力学模型
DOI：
10.1016/j.conbuildmat.2016.04.008
复制
发表时间：
2016-07
影响因子：
7.4
通讯作者：
Wang Yaqiong
中科院分区：
文献类型：
--
作者：
Chen Qing;Zhu Hehua;Yan Zhiguo;Ju J Woody;Jiang Zhengwu;Wang Yaqiong
尽管混杂纤维增强混凝土（HFRC）已广泛应用于许多结构中，但其细观力学模型却很少。为了定量预测考虑骨料和界面过渡区（ITZ）效应的HFRC的有效性能，提出了基于材料微观结构的多相细观力学框架。该模型综合考虑了纤维、骨料、水泥浆体和界面的多种类型。ITZ的体积分数是根据骨料级配分析计算的。提出了多层均匀化方法来预测HFRC的有效性能。利用广义自洽方法，通过一级和二级均匀化程序获得由骨料、水泥及其界面过渡区组成的等效矩阵。通过在等效基体中逐步加入不同类型的纤维，对Halpin-Tsai模型进行修正，得到HFRC的性能。为了证明所提出的微机械框架的可行性，本文的预测与实验数据，Voigt上限和Reuss下限进行了比较。最后，基于所提出的细观力学模型，讨论了骨料、界面结合区、纤维种类对HFRC性能的影响。
Very few micromechanical models are available for hybrid fiber reinforced concrete (HFRC), although it has been widely applied in many structures. To quantitatively predict the effective properties of HFRC with the aggregate and interfacial transition zone (ITZ) effects, a multi-phase micromechanical framework is proposed based on the material’s microstructures. In the proposed model, the multi-types of fibers, aggregate, cement paste and ITZ are comprehensively considered. The volume fraction of the ITZ is analytically calculated based on the aggregate grading. Multi-level homogenization schemes are presented to predict the effective properties of HFRC. By utilizing the generalized self-consistent approach, the equivalent matrix composed by the aggregate, cement and the ITZ between them are obtained with the first and second level homogenization procedures. Through adding different types of fibers step by step into the equivalent matrix, the properties of HFRC are reached with the modifications to the Halpin-Tsai model. To demonstrate the feasibility of the proposed micromechanical framework, the predictions herein are compared with the experimental data, the Voigt upper bound and the Reuss lower bound. Finally, the influences of aggregate, ITZ, multi-types of fibers on the properties of HFRC are discussed based on the proposed micromechanical model.
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DOI：
10.1016/j.ijimpeng.2005.05.003
发表时间：
2006-11-01
影响因子：
5.1
作者：
Badr, A;Ashour, AF;Platten, AK
通讯作者：
Platten, AK
影响因子：
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影响因子：
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作者：
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影响因子：
10.5
作者：
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影响因子：
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