[1]张立明 江羽习 李育林 张媛媛.混凝土界面过渡区力学性质的非均质性对混凝土强度和损伤演化的影响[J].大众科技,2021,23(2):24-27.
　Effect of Heterogeneity of Mechanical Properties of Concrete Interfacial Transition Zone on Concrete Strength and Damage Evolution[J].Popular Science & Technology,2021,23(2):24-27.
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混凝土界面过渡区力学性质的非均质性对 混凝土强度和损伤演化的影响()
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《大众科技》[ISSN:1008-1151/CN:45-1235/N]

卷:
23
期数:
2021年2
页码:
24-27
栏目:
建设与工程
出版日期:
2021-02-20

文章信息/Info

Title:
Effect of Heterogeneity of Mechanical Properties of Concrete Interfacial Transition Zone on Concrete Strength and Damage Evolution
作者:
张立明 1; 2 江羽习 1 李育林 1 张媛媛 1
（1.广西路建工程集团有限公司，广西 南宁 530001； 2.南宁市筑路技术与筑路材料工程技术研究中心，广西 南宁 530001）
关键词:
混凝土; 界面过渡区; 非均质性; 强度; 损伤演化
Keywords:
concrete interface transition zone heterogeneity strength damage evolution
文献标志码:
A
摘要:
混凝土是一种典型的由骨料、水泥砂浆和两者之间的界面过渡区组成的三相复合介质。文章采用 PFC3D 软件， 生成了结构上含三维随机骨料、界面过渡区在力学性质上服从 Weibull 分布的颗粒集合体模型。研究了混凝土中界面过渡区的 力学参数的非均质性对混凝土宏观力学性质和损伤演化的影响。研究结果表明：（1）界面过渡区的非均质性对混凝土的宏观力 学性质产生了很大的影响。随着界面过渡区的均匀性指数的增加，混凝土模型的单轴压缩强度和弹性模量均增加。且均匀性指 数和单轴压缩强度、弹性模量拟合呈指数函数关系。（2）界面过渡区的非均质性对微裂纹萌生和损伤演化产生很大影响。损伤 演化大致分为三个阶段：Ⅰ为初始损伤阶段；Ⅱ为损伤稳定发展阶段；Ⅲ为损伤破坏阶段。（3）随着均匀性指数的增加，损伤 变量门槛值逐渐下降，两者呈指数函数关系。
Abstract:
he two. In this paper, PFC3D software is used to generate a particle assembly model with three-dimensional random aggregates and a transitional zone in the mechanical properties obeying the Weibull distribution. The effects of the heterogeneity of the mechanical parameters of the interfacial transition zone on the macroscopic mechanical properties and damage evolution of concrete were studied. The results show that: (1) The heterogeneity of the interface transition zone has a great impact on the macroscopic mechanical properties of concrete. As the uniformity index of the interface transition zone increases, the uniaxial compressive strength and elastic modulus of the concrete model increase. And the uniformity index and the uniaxial compressive strength and elastic modulus fit are exponentially related. (2) The heterogeneity of the interface transition zone has a great influence on the microcrack initiation and damage evolution. The damage evolution is roughly divided into three stages: I is initial damage stage II is stage of damage stability development III is stage of damage damage. (3) With the increase of the uniformity index, the threshold value of the damage variable gradually decreases, and the two are exponentially related.

参考文献/References:

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备注/Memo

备注/Memo:
【收稿日期】2020-12-08 【基金项目】广西住建厅研究开发项目“高强沥青及沥青混合料路用关键核心技术研究及在市政道路工程中示范应用” （桂建科〔2019〕9 号）；南宁市兴宁区科技项目“高粘沥青及沥青混合料路用性能研究”（南兴发科〔2019〕23 号）；南宁市 科技项目“氧化石墨烯改性沥青及其混合料关键技术研究”（20201062）。 【作者简介】张立明（1978－），男，吉林九台人，广西路建工程集团有限公司高级工程师，技术中心科研负责人，博士， 研究方向为混凝土材料及结构耐久性。
更新日期/Last Update: 2021-05-19