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.

中文翻译：

---

BSE-IA揭示了聚合物粉末对水泥水合作用的阻滞机理

结合背散射电子图像分析，扫描电镜，能谱仪研究了两种聚合物粉对苯乙烯水化的阻滞作用，以及水合度和微观结构特征的机理。和X射线衍射。结果表明，两种聚合物均可显着延迟水泥的水合作用，同时降低水泥的水合度和水合产物的厚度。聚合物通过将聚合物颗粒凝聚在水泥颗粒的表面上，形成厚度不同的膜并将钙离子键合在孔隙溶液中来阻止水泥的水化。因此，抑制了C–S–H和CH的形成，并提高了水合产物层中的Ca / Si比。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合作用的阻滞作用，从而可以合理开发聚合物改性的水泥基材料，以进一步应用。