Polymer-modified mortar with a gradient polymer distribution: Preparation, permeability, and mechanical behaviour
Polymer-modified mortar with a gradient polymer distribution: Preparation, permeability, and mechanical behaviour
复制标题
具有梯度聚合物分布的聚合物改性砂浆：制备、渗透性和力学性能
DOI：
10.1016/j.conbuildmat.2012.07.080
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发表时间：
2013-01-01
影响因子：
7.4
通讯作者：
Li, Jiao-Li
中科院分区：
文献类型：
--
作者：
Kong, Xiang-Ming;Wu, Chun-Chao;Li, Jiao-Li
开发了一种在聚合物改性砂浆 (PMM) 中产生聚合物梯度分布的技术，以最大限度地减少 PMM 中的聚合物添加量，同时又不损失改进的性能。使用磁响应聚合物乳胶对砂浆进行改性，并在成型过程中受到磁场的影响。在磁力驱动下，添加的聚合物颗粒富集在PMM的表面区域，在硬化砂浆中生成聚合物含量更高的致密保护层，增加了材料的抗渗性。通过热重分析和X射线衍射分析证实了梯度聚合物分布。根据ASTM-C1202进行氯离子渗透性测试和交流阻抗谱测量，以比较具有相同聚合物添加量的梯度和均质聚合物分布的PMM的渗透性。弯曲测试的结果表明，当在测试过程中将富含聚合物的一侧向下放置时，梯度聚合物分布导致更高的弯曲强度。 (C) 2012 Elsevier Ltd. 保留所有权利。
A technology that produces a gradient polymer distribution in polymer-modified mortar (PMM) was developed to minimize the polymer addition in PMM without losing the improved properties. The mortar was modified using a magnetic responsive polymer latex and was subjected to a magnetic field during moulding. Driven by magnetic force, the added polymer particles were enriched in the superficial region of the PMM, and a dense protective layer with much higher polymer content was generated in the hardened mortar, which increased the impermeability of the material. The gradient polymer distribution was confirmed by thermogravimetric analysis and X-ray diffraction analysis. The chloride permeability test according to ASTM-C1202 and alternative current impedance spectroscopy measurement were carried out to compare the permeability of PMM with the gradient and homogenous polymer distributions with the same polymer addition. The results from the bending test revealed that the gradient polymer distribution led to a higher flexural strength when the polymer-rich side was placed downwards during the test. (C) 2012 Elsevier Ltd. All rights reserved.