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Improvement of mechanical properties and chloride ion penetration resistance of cement pastes with the addition of pre-dispersed silica fume

机译：添加预分散的硅粉改善水泥浆的机械性能和抗氯离子渗透性

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The addition of pre-dispersed silica fume (DSF) into cement pastes can enormously improve the engineering property of cement pastes. Yet it is hard to evaluate the distribution of DSF and the absorption process between cement and DSF quantitatively. Therefore, an approach (the titration test) was used to investigate the distribution of DSF and the adsorption process quantitatively in cement pastes. After the examination of the physical and chemical properties of DSF modified cement-based materials, ideal results were obtained in this work. This paper highlights the primary findings in manufacturing and characterizing of DSF modified cement-based materials. For macroscopic performance, the pressure testing machine was used to test the mechanical properties of DSF modified cement-based materials. Meanwhile, Zeta potential analyzer was used to monitor the surface charges of particles in cementitious materials with different DSF contents. From a microcosmic perspective, scanning electron microscope (SEM) was used to capture the microstructure of the compound materials. In addition, to research the influential factors on DSF in the process of ball milling, ball milling time and the parameter of DSF of each ball milling process and other components added into the liquid were taken into account. Finally, the hydration process was simulated. The results show that the DSF can improve the mechanical properties and chloride ion penetration resistance of the sample. The simulated hydration process consists of five stages, which are agglomeration-trigger adsorption (Stage I), initial stable absorption (Stage II), free-dispersion (Stage III), reagglomeration-trigger absorption (Stage IV) and secondary absorption (Stage V). The five stages reflect the corresponding reaction characterization of DSF modified cement-based materials. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在水泥浆中添加预分散的硅粉（DSF）可以极大地改善水泥浆的工程性能。然而，很难定量评估DSF的分布以及水泥与DSF之间的吸收过程。因此，采用了一种方法（滴定试验）来定量研究水泥浆中DSF的分布和吸附过程。在检查了DSF改性水泥基材料的物理和化学性质之后，在这项工作中获得了理想的结果。本文重点介绍了DSF改性水泥基材料在制造和表征中的主要发现。对于宏观性能，压力测试机用于测试DSF改性水泥基材料的机械性能。同时，使用Zeta电势分析仪监测DSF含量不同的胶凝材料中颗粒的表面电荷。从微观角度来看，使用扫描电子显微镜（SEM）捕获化合物材料的微观结构。另外，为研究球磨过程中DSF的影响因素，还考虑了球磨时间，每个球磨过程的DSF参数以及添加到液体中的其他成分。最后，模拟了水合过程。结果表明，DSF可以改善样品的机械性能和耐氯离子渗透性。模拟的水化过程包括五个阶段，分别是结块触发吸附（阶段I），初始稳定吸收（阶段II），自由分散（阶段III），重结块触发吸收（阶段IV）和二次吸收（阶段V）。 ）。这五个阶段反映了DSF改性水泥基材料的相应反应特性。 （C）2018 Elsevier Ltd.保留所有权利。

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