| In the recent twenty years, it is very common to add lime into natural granule soil or clay so as to obtain stable material as the modified material. As lime-soil has such functions as high strength, strong integrity and cheap cost, it is widely used to the bottom, sub-base as well as base in pavement. The high class highway develops quickly in the recent years. As a result, many road construction projects adopt lime-soil to fill and build subgrade, which takes the advantages of its strong integrity, high carrying capacity, huge rigidity and water stability so as to promote the quality of project construction.As the lime-soil is constantly applied in road construction, the construction technique of lime-soil is more and more mature. However, it is very common that lime content or compactness can not conform to the standard requirements in the real construction quality inspection, mainly because lime content changes as the time passes and physical and chemical reactions take place in effective calcium and magnesium hydronium in lime-soil as well as active silicon and active aluminium in soil. There is a great gap between the inspected amount of lime content and the real one. The means to use the greatest dry density corresponding with the real lime content to inspect the compaction does not conform to the reality, which brings some uncertain factors to the quality inspection of the construction. This has been studied, discussed and analyzed many times domestically.On the basis of analysis with regard to lime-soil reaction mechanism and all kinds of impact factors, this paper analyzes the law about the influence of compactness, lime content, conservation condition and water content on effective calcium and magnesium content decaying in lime-soil as well as the impact of real factors on lime content and compactness in the process of lime-soil construction by means of many indoor experiments, which provides useful suggestions for the real construction.
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