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首页> 外文期刊>Cement & concrete composites >Influence of silica fume content on microstructure development and bond to steel fiber in ultra-high strength cement-based materials (UHSC)
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Influence of silica fume content on microstructure development and bond to steel fiber in ultra-high strength cement-based materials (UHSC)

机译：硅粉含量对超高强度水泥基材料（UHSC）中微观结构发展和与钢纤维结合的影响

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摘要

The use of silica fume can significantly enhance mechanical properties of concrete given its beneficial filling and pozzolanic effects. In this study, a simple and effective double-side pullout testing method was adopted to characterize the interfacial bond properties, which include pullout load-slip relationship, bond strength, and pullout energy, of steel fiber-matrix in ultra-high strength cement-based material (UHSC) with 0-25% silica fume by the mass of binder. The effects of silica fume content on flowability, heat of hydration, compressive and flexural strengths, hydration products, and pore structure of matrix at different curing time were evaluated as well. Backscatter scanning electron microscopy (BSEM) and micro-hardness measurement were used to examine the quality of interfacial transition zone (ITZ) around the fiber. In terms of the results, the optimal silica fume content could "be in the range of 15% -25%. UHSC mixtures with these dosages of silica fume showed significant improvement in pullout behavior. Its bond strength and pullout energy at 28 d could increase by 170% and 250% compared to the reference samples without any silica fume. The microstructural observation verified the findings on the macro-properties development. Formation of more and higher strength of hydration products and refinement of ITZ around the fiber ensured higher micro-hardness, and thus improved the bond to fiber. (C) 2016 Elsevier Ltd. All rights reserved.
机译：鉴于其有益的填充和火山灰作用，使用硅粉可显着提高混凝土的机械性能。在这项研究中，采用了一种简单有效的双面拉拔测试方法来表征超高强度水泥混凝土中钢纤维基体的界面粘结特性，包括拉拔载荷-滑动关系，粘结强度和拉拔能量。粘合剂质量为0-25％的硅粉的基料（UHSC）。还评估了硅粉含量对不同固化时间的流动性，水合热，抗压强度和挠曲强度，水合产物以及基质孔结构的影响。使用背散射扫描电子显微镜（BSEM）和显微硬度测量来检查纤维周围的界面过渡区（ITZ）的质量。根据结果​​，最佳硅粉含量可以在“ 15％-25％的范围内。使用这些剂量的硅粉的UHSC混合物表现出明显的拔出性能改善。其粘结强度和28 d的拔出能可以增加与不含任何硅粉的参比样品相比，分别提高了170％和250％。微观结构观察证实了宏观性能发展的发现。水合产物强度越来越高的形成以及纤维周围ITZ的细化确保了更高的显微硬度（C）2016 Elsevier Ltd.保留所有权利。

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