| Summary: | 碩士 === 中原大學 === 土木工程研究所 === 93 === Abstract
Although the research on soil-cement properties is very abundant in Taiwan, materials used to improve soil-cement properties are still those traditional materials such as fly ash, blast furnace slag, superplasticizer or water-reducing admixture. For the trend of nano-materials are widely used in many applications, if a small amount of nano-materials propertional added into cement and mix with soil, the soil-cement properties could be enhanced and perhaps save the cement usage in some real construction cases.
The main discussion of the research is to understand the influence of soil-cement properties when added nano-materials. The soil used for the experiment is extracted from the Hu-Suan reservoir. I used different proportions(5%,9%,13%) of cement to conduct compaction test, then according to the test results to make samples and put different proportions(1%,2%,3%) of nano powder and nano clay in them. Furthermore, I conducted unconfined compressive test, triaxial permeability test and wave velocity test after different curing periods(7,28,56 days) and observe the transformation of soil-cement properties when added nano materials.
According to the test result, I found that the permeability of soil-cement has evidently decreased after nano-materials were added. For the test samples that have 9% cement and of 7 days curing period, the permeability coefficient was reduced by 60~74% when 3% nano powder was added and reduce 52~74% when 1% nano clay was added. Besides, I also found that adding either 3% nano powder or 1% nano clay to 5% cement content sample could make the permeability coefficient lower than that in the sample which has 13% cement content and no nano-matrrials. It could be concluded that a small amount of nano materials can replace high cement content when improve the permeability of soil-cement. On the other hand, nano-materials may also enhance the compressive stress and wave transforming ability. For the test sample that has 5% cement and after 28days curing period, the compressive stress was increased by 23~28% when 3% nano powder was added and 12~36% when 2% nano clay was added in the sample. Moreover, samples have same cement content and curing period of 56 days, the wave velocity was increased by 18~20% after 1% nano powder was added and 12~15% when nano clay was added in the sample.
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