| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 91 === This research used Danang sand as the representing material of in-situ reclaimed soil to investigate the properties of liquefaction and to evaluate the improvement effects attributed to using cement. A series of experiments have been done on a set of samples made by using wet tamping method. The set consists of samples having different fine contents (5%, 10%, and 15%) mixed with different cement contents (0.5%, 1.0%, and 2.0%). After curing for 7 or 28 days, the unconfined compression tests and dynamic triaxial tests were conducted.
According to the experimental results, adding cement into the sands containing fine contents will significantly be enhanced the unconfined compression strength. On the other hand, the shear strength tends to be improved while the fine content is increased. However, when the fine content goes up to more than 10%, the unconfined compression strengths tend to decrease due to the change of soil structure.
Under the experiment conditions, when the curing period is 7 days, adding cement of 2% mixing rates to the sand containing fine content will increase the liquefaction resistance. For the case of 28-day curing, adding cement of 1% mixing rates to the sand containing fine content will also have the same effect. As a brief summary, by controlling the fine content at about 10% along with adding cement, it will result in a better liquefaction resistance than the other ratio.
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