BSE‐IA reveals retardation mechanisms of polymer powders on cement hydration
BSE‐IA reveals retardation mechanisms of polymer powders on cement hydration
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BSE-IA 揭示了聚合物粉末对水泥水化的延迟机制
DOI：
10.1111/jace.16982
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发表时间：
2020-05
影响因子：
3.9
通讯作者：
Xianping Liu
中科院分区：
文献类型：
--
作者：
Yu Peng;Qiang Zeng;Shilang Xu;Guorong Zhao;Peiming Wang;Xianping Liu
采用背散射电子图像分析、扫描电子显微镜、能谱仪和X射线衍射等方法，研究了丁苯橡胶和乙烯-醋酸乙烯酯两种聚合物粉末对水泥水化的阻滞作用，并从水化程度和微观结构特征方面探讨了其作用机理。结果表明，两种聚合物均能显著延缓水泥水化，降低水泥水化程度和水化产物厚度。聚合物通过在水泥颗粒表面聚集聚合物颗粒，形成不同厚度的聚合物膜，并与孔隙溶液中的钙离子结合，延缓水泥水化。因此，C-S-H和CH的形成受到抑制，水化产物层中的Ca/Si比升高。延迟随着聚合物含量的增加而增强。这项工作有助于深入了解聚合物对水泥水化的阻滞作用，从而为进一步应用聚合物改性水泥基材料提供合理的开发。
The retardation effects of two polymer powders, styrene butadiene rubber and ethylene‐vinyl acetate, on cement hydration and the mechanisms in terms of hydration degree and microstructure characteristics were investigated by the combination of backscattered electron image analysis, scanning electron microscopy, energy dispersive spectrometer, and X‐ray diffraction. Results show that the cement hydration can be significantly retarded by both polymers with the reductions in cement hydration degrees and hydration products thickness. Polymers retard cement hydration by agglomerating the polymer particles on the surfaces of cement grains, forming films in different thickness and bonding the calcium ions in the pore solutions. Consequentially, the formation of C‐S‐H and CH is depressed and the Ca/Si ratios in the hydration product layer are raised. The retardation is enhanced with the increase in polymer content. This work helps understand the retardation effect of polymers on cement hydration in depth, which enables rational development of polymer‐modified cement‐based materials for further applications.
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