羟基铝及其聚合物对蒙脱土力学特性影响的试验研究  

Experimental Study of Influence of Hydroxy-aluminum/Polyaluminum on Mechanical Characteristics of Montmorillonite

作　　者：孙世永[1] 姚海林[1] 董启朋[1] 段建新[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《上海交通大学学报》2013年第9期1363-1366,共4页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金项目(51279198)资助

摘　　要：提出了一种原位处理膨胀土的新方法,利用羟基铝与蒙脱土发生反应而制成不同的改性试样,将改性后的蒙脱土在特定条件下养护一定的时间,通过X射线衍射分析、强度及膨胀性试验等手段探讨了羟基铝及其聚合物对蒙脱土力学性质的影响.结果表明:羟基铝与蒙脱土通过离子交换、包被、胶结成键等物理化学反应改变了土体的亲水性和强度特性;经羟基铝改性后,显著提高了蒙脱土的物理特性和强度指标,改善了其膨胀性,达到了非膨胀土的性能要求.The hydroxy-aluminum/polyaluminum modified clay and the clay only samples were examined by X-ray diffraction （XRD）, unconconsolidated undrained （UU） triaxial strength test, unconfined compres- sive strength testing techniques, swelling potential tests and so on. The results indicated that the hydro- philic nature and swelling-shrinkage property were changed drastically, that the free swelling ratio （F~） could be reduced sharply, and that the particle size gradation, strength characteristics of the modified montmorillonite clay were improved greatly. The clay content decreased dramatically, while the silt con- tent increased. This study suggests that the hydroxy-aluminum/polyaluminum can influence the mechani- cal and physical properties of montmorillonite clay by physicochemical interaction.

关 键 词：蒙脱土 羟基铝及其聚合物 改性 

分 类 号：TU443[建筑科学—岩土工程]