石灰处理土的物理力学性质及其微观机理的研究

The Physio-mechanical Properties and Micro-mechanism in Lime-soil System

本文在回顾前人研究石灰与土相互作用的基础上,对石灰加固土的物理力学性质作了广泛的讨论,并结合宏观性质对加固的微观机理作了比较深入的研究。粉末 x 射线衍射法试验证实了在长期养护或高温养护下,石灰与土反应生成具有凝胶性质的产物——水化硅(铝)酸钙(CSH)微晶体。孔容试验表明,随着时间的增长,石灰与土的生成物在数量上不断增加,其孔径减小。扫描电镜的微观结构研究发现了生成物的强度随时间增长的原因——CSH 的产生和结晶使得土的微结构更加牢固。最后讨论了添加剂在提高强度方面的作用,并结合实际工程应用,讨论了影响石灰加固效果的因素。

Based on reviewing the published papers on the multi-reaction of lime-soil system, this paper makes a wide range of discussion on the physieo-mechanical properties of sta- bilized soil Besides the macro-properties,the micro-mechanism of strengthened soil is also studied With powder X-ray diffraction,it has been shown that the cementitions mater- inl——Calcium Silicate(Aluminate)Hydrate(CS(A)H)is produced by the slowly lime-soil reaction during long curing time or high temperature circumstance,using prosimetry ana- lysis,it is suggested that the cementitions material increases in quantity with the curing time and results in a gradual replacement of capillary pore space with fine gel pores. The micro-fabric of soil samples indifferent ages under the scanning electric microscope sheds some light on setting the relation between strength increase and curing time,that is the producing of CSH gel,then forms a poorly crystallizad material which can make a strong bonding of soll particles. Other chemical additives'role in increasing strength and facters that may possible- ly influence the effect of lime stabilization in practical application are also approached.