聚合物稳定沙土的作用机制探讨

Study on Acting Mechanism of Polymers on Stabilizing Sandy Soil

对聚合物稳定沙土的作用机制从分子间作用、聚合物性质和界面作用等3个方面进行研究。结果表明:干燥状态下阴离子基团与沙土颗粒的结合作用为化学键形式,强于非离子基团的氢键结合;但阴离子基团含量过高会降低聚合物处理后沙土的水稳定性。合适的高分子沙土稳定材料应该具有良好的水分散性、较高的平均分子质量、合适的阴离子和非离子基团含量以及较伸展的分子构象。提出了干燥状态下聚合物与沙土颗粒之间存在粘接作用,聚合物性质与其沙土稳定效能之间的关系也可以用粘接原理进行解释。

The acting mechanism of polymers on stabilizing sandy soil was investigated respectively on three aspects namely intermolecular action, polymer properties and interface action. It was proposed that, in dry status sand grains were linked by anionic groups through chemical bond, which was stronger than hydrogen bond that linked non_ionic groups to sand grains. But too many ionic groups on polymer structure would reduce the water_stability of sandy soil treated by polymers. The proper polymer materials for stabilizing sandy soil should have good water dispersibility, high average molecular weight, proper content of both anionic and non_ionic groups, and extended molecular conformation. It was also proposed that, in dry status, there was adhesive action between polymers and sand grains, and relations between polymers’ properties and their performance on stabilizing sandy soil could also be explained with adhesion principles.