A multiscale creep model as basis for simulation of early-age concrete behavior
A multiscale creep model as basis for simulation of early-age concrete behavior
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DOI：
10.12989/cac.2008.5.4.295
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发表时间：
2008-08
影响因子：
4.1
通讯作者：
C. Pichler;R. Lackner
中科院分区：
文献类型：
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作者：
C. Pichler;R. Lackner
先前发表的早期水泥基材料的多尺度模型[Pichler等人，2007年。“早期水泥基材料自收缩变形的多尺度微观力学模型。“Engineering Fracture Mechanics，74，34-58]扩展到粘弹性性质的升级。所获得的模型将宏观行为联系起来，即，混凝土样品的蠕变顺应性，在更精细的尺度上的混凝土的组成和在这些尺度上的不同相的（假定的）固有材料性质。虽然通过最近开发的普通波特兰水泥（OPC）中主要熟料相的水化模型可以获得更细尺度的组成（及其历史），但更细尺度下蠕变活性组分的粘性，即，硅酸钙水合物（CSH）的宏观蠕变试验，使用建议的多尺度模型。建议的多尺度模型进行评估不同的混凝土徐变试验报告在公开文献中。此外，该模型的预测相比，常用的宏观蠕变模型，所谓的B3模型。
A previously published multiscale model for early-age cement-based materials [Pichler, et al.2007. "A multiscale micromechanics model for the autogenous-shrinkage deformation of early-age cement-based materials." Engineering Fracture Mechanics, 74, 34-58] is extended towards upscaling of viscoelastic properties. The obtained model links macroscopic behavior, i.e., creep compliance of concrete samples, to the composition of concrete at finer scales and the (supposedly) intrinsic material properties of distinct phases at these scales. Whereas finer-scale composition (and its history) is accessible through recently developed hydration models for the main clinker phases in ordinary Portland cement (OPC), viscous properties of the creep active constituent at finer scales, i.e., calcium-silicate-hydrates (CSH) are identified from macroscopic creep tests using the proposed multiscale model. The proposed multiscale model is assessed by different concrete creep tests reported in the open literature. Moreover, the model prediction is compared to a commonly used macroscopic creep model, the so-called B3 model.