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首页> 外文期刊>Materials and structures >Simulation of the microstructure formation in hardening self-compacting cement paste containing limestone powder as filler via computer-based model
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Simulation of the microstructure formation in hardening self-compacting cement paste containing limestone powder as filler via computer-based model

机译：通过计算机模型模拟硬化含石灰石粉作为填料的自密实水泥浆的微观结构

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摘要

With the development of concrete technology, fillers are widely used in high performance concrete to improve its properties. Among them, limestone powder is popularly added in self-compacting concrete to gain good flowability. However, by lack of experimental data, several materials properties after the addition of limestone powder are still not sure, which actually yield some uncertainty for the further use of limestone powder in cement-based materials. In this study, by employing computer-based model, the microstructure of self-compacting cement paste containing limestone as filler is simulated and further used to investigate the role of limestone in hardening materials. To gain this goal, thermometric isothermal conduction calorimetry, thermal analysis and backscattered electron image acquisition were applied to understand the hydration kinetics with the addition of limestone filler. After that, a computational materials model based on HYMOSTRUC was developed to simulate the formation of microstructure in materials containing limestone powder. The predictive ability of the model was validated with the experimental test results. Then the developed model was employed to investigate the influence of several variables, such as water to cement ratio, limestone filler content and fineness, on the microstructure formation in hardening materials. The numerical experiments show that the addition of limestone filler could result in a denser microstructure at the initial hydration stage. With the proceeding of hydration, the limestone powder has a decreasing influence on the microstructure, and could obstruct somewhat the formation of a denser microstructure at later hydration stage. And it is found that computer-based modelling is an effective method to provide insights into the material behaviour, by relieving researchers from numerous repeated experiments.
机译：随着混凝土技术的发展，填料被广泛用于高性能混凝土中以改善其性能。其中，通常在自密实混凝土中添加石灰石粉以获得良好的流动性。然而，由于缺乏实验数据，在加入石灰石粉后仍不确定几种材料的性能，这实际上为在水泥基材料中进一步使用石灰石粉带来了不确定性。在这项研究中，通过使用基于计算机的模型，模拟了以石灰石为填料的自密实水泥浆的微观结构，并进一步用于研究石灰石在硬化材料中的作用。为了达到这个目的，应用了等温热传导量热法，热分析和反向散射电子图像采集技术，以了解添加石灰石填料后的水合动力学。之后，建立了基于HYMOSTRUC的计算材料模型，以模拟含石灰石粉末的材料中微观结构的形成。实验测试结果验证了模型的预测能力。然后使用开发的模型研究水灰比，石灰石填料含量和细度等几个变量对硬化材料微观结构形成的影响。数值实验表明，石灰石填料的添加在初始水合阶段可导致致密的微观结构。随着水化的进行，石灰石粉对微观结构的影响逐渐减小，并在以后的水化阶段可能会稍稍阻碍致密的微观结构的形成。结果发现，通过从大量重复的实验中减轻研究人员的精力，基于计算机的建模是一种有效的方法，可提供对材料行为的见解。

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  • 来源
    《Materials and structures》 |2013年第11期|1861-1879|共19页
  • 作者

    Xian Liu; Guang Ye; Geert De Schutter; Yong Yuan;

  • 作者单位

    Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China,Department of Geotechnical Engineering, Tongji University, Shanghai, China;

    Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Ghent, Belgium,Microlab, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands;

    Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Ghent, Belgium;

    Department of Geotechnical Engineering, Tongji University, Shanghai, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Limestone powder; Self-compacting material; Microstructure; Computer-based model;

    机译：石灰石粉;自密实材料;微观结构基于计算机的模型;

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