奈米材料影響土壤水泥滲透性質及強度性質之試驗研究

A Study of Effects of Nano-Materials in Permeability and Strength Properties of Soil-Cement

羅鴻傑(Hung-Chieh Lo)

指導教授 ： 馮道偉

中原大學/工學院/土木工程研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500376

摘要

摘要
國內對於土壤水泥特性的研究已具有相當豐富之經驗，然而在水泥中添加其他材料來改善其性質的研究卻仍停留在傳統的礦物材料如飛灰、爐石粉，或是強塑劑、減水劑等化學摻料上；鑒於今日奈米材料在各領域的廣泛研究與應用，若以少量奈米材料添加比例加入波特蘭水泥，再摻入土壤中進行改良能夠產生更為顯著的力學特性，或許在實際工程案例中能達到節省水泥用量之效益。
本研究先行探討土壤水泥的工程特性，並更進一步探討添加奈米材料後對土壤水泥性質的影響，研究所使用的土壤取自雲林湖山水庫庫區，以波特蘭一型水泥為改良材料在不同配比下(5%、9%、13%)施作夯實試驗，再根據夯實結果製作試體，依照比例(1%、2%、3%)添加奈米矽粉及奈米黏土在不同的養護齡期(7天、28天、56天)進行單壓、滲透及波速量測試驗，探討土壤水泥添加奈米材料後性質的改變。
研究結果顯示，土壤水泥的滲透性會因為奈米材料的添加而降低，例如試體添加9 %水泥在養護7天的條件下，添加3 %奈米矽粉後試體的滲透係數可較未添加奈米材料降低60~74 %，添加1 %奈米黏土試體也可減少52~74 %；此外，由試驗結果亦可看出，在5 %水泥含量的土壤試體中不論是添加3 %的奈米矽粉或是1 %的奈米黏土，其滲透係數均較添加13 %水泥且未添加奈米材料的滲透係數低，表示土壤水泥的滲透性，可藉由少量奈米矽粉的添加來取代高用量的水泥。而在土壤水泥強度及波速特性方面，也會因奈米材料的添加而增加，以添加5 %水泥養護28天的條件為例，試體添加3 %奈米矽粉抗壓強度可提升23~28 %，添加2 %奈米黏土亦可增加12~36 %；而在相同水泥添加量養護56天的條件下，試體添加1 %奈米矽粉後波速可提昇18~20 %，添加1 %奈米黏土則可提昇12~15 %。

關鍵字

土壤水泥 ； 奈米矽粉 ； 奈米粘土

並列摘要

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.

並列關鍵字

soil cement ； nano clay ； nano powder

參考文獻

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