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首页> 外文期刊>Construction and Building Materials >Effect of aliphatic-based superplasticizer on Theological performance of cement paste plasticized by polycarboxylate superplasticizer
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Effect of aliphatic-based superplasticizer on Theological performance of cement paste plasticized by polycarboxylate superplasticizer

机译：脂族基高效减水剂对聚羧酸酯高效减水剂增塑水泥浆流变性能的影响

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摘要

Polycarboxylate superplasticizer (PCE) and aliphatic superplasticizer (AS) are widely used water-reducing agent in concrete. In actual practice, the addition of AS has been developed as a common way to alleviate the bleeding and segregation of concrete plasticized by PCE, while the main reason for this phenomenon is not clear. In this research, the effect of AS on dispersion of PCE was investigated. Adsorption behavior of AS and PCE and conformation of these polymers in liquid phase were analyzed with total organic carbon (TOC), conductivity, and dynamic light scattering (DLS). Finally, the experimental results were verified by molecular dynamics simulation, and the dispersion model was proposed to better understand the mechanism behind. The results showed that the effects of AS on the rheological performance of cement paste containing PCE was closely related to the added dosage, and it was observed that three stages were divided according to the dosage of AS. The main reason was due to competitive adsorption between AS and PCE. In addition, PCE molecules, which existed in the liquid phase due to competitive adsorption, would be crosslinked through calcium ions in pore solution, leading to the increase in plastic viscosity of cement paste despite with the decreased yield stress. These results explained why the addition of AS in PCE system could enhance the resistance to bleeding and segregation. These results would offer usefully experience for the application of multiple superplasticizer systems in practical engineering. (C) 2019 Elsevier Ltd. All rights reserved.
机译：聚羧酸类减水剂（PCE）和脂族类减水剂（AS）是混凝土中广泛使用的减水剂。在实际实践中，已开发出添加AS的方法，以减轻PCE增塑的混凝土的渗出和偏析，而造成这种现象的主要原因尚不清楚。在这项研究中，研究了AS对PCE分散的影响。用总有机碳（TOC），电导率和动态光散射（DLS）分析了AS和PCE的吸附行为以及这些聚合物在液相中的构象。最后，通过分子动力学模拟验证了实验结果，并提出了分散模型以更好地理解其背后的机理。结果表明，AS对含有PCE的水泥浆流变性能的影响与添加量密切相关，并且观察到按AS的用量分为三个阶段。主要原因是AS和PCE之间的竞争性吸附。另外，由于竞争性吸附而存在于液相中的PCE分子将通过孔溶液中的钙离子交联，尽管降低了屈服应力，但仍导致水泥浆的塑性粘度增加。这些结果解释了为什么在PCE系统中添加AS可以增强抗出血和隔离的能力。这些结果将为多种高效减水剂系统在实际工程中的应用提供有益的经验。 （C）2019 Elsevier Ltd.保留所有权利。

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