土壤粘合剂粘结土壤结构性能表征

Characterization of structure and performance for bonded soil with soil binders

利用土壤粘合剂对土壤进行粘结 ,以改善土壤的粘结性能 ,达到提高土壤压缩强度的效果 ;应用X射线衍射 (XRD)及X射线光电子能谱 (XPS)对土壤施用土壤粘合剂前后的物相及表面化学结构进行分析 ;简述土壤粘合剂的粘结机理 ;结果表明 :土壤粘合剂粘结性能与SiO2 溶胶数量及结构性能有关。土壤经粘结处理后 ,活化的SiO2 凝胶中含有大量的活性基团 (─Si─OH) ,这些活性基团和土壤中的物质进一步反应 ,脱水生成硅氧化学键Si─O─M。土壤粘结强度由SiO2 凝胶固化强度及土壤与SiO2 凝胶形成的硅氧化学键结合强度构成。

The bonding performance can be modified by use of soil binder and enhanced soil compression strength was achieved.X-ray diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) were used to analyze the material phase and the chemical structure on the surface of unbonded and bonded soil samples.The bonding mechanism of soil binder was discussed.The experimental results showed that the bonding performance of the soil binder was related to its gel SiO_2 content and structure of the noncrystalline phase.When the soil was bonded,there were a great number of reactive groups(-Si-OH) in the activated gel SiO_2,which further interacted with soil and produced silicon-oxygen bond Si-O-M.Total bonding strength was consisted of crosslinking strength of gel SiO_2 and silicon-oxygen bond strength which were formed by gel SiO_2 with soil.