綠色高韌性纖維混凝土(Green-ECC)本土化發展與自癒合能力之研究

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姓名

蘇彥方(Yen-fang Su) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

綠色高韌性纖維混凝土(Green-ECC)本土化發展與自癒合能力之研究

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摘要(中)

本研究以發展高韌性混凝土(Engineered Cementitious Composites，之後簡稱ECC)之本土化材料設計為出發點，討論水膠比之變化與製造流程的創新，探究其對ECC重要力學性質之影響，包含：拉力、壓力、撓曲性質、以及流變性質。成功利用本土化材料如水泥、飛灰、矽砂、以及強塑劑等，研發出兼具高流動性、高韌性、以及高強度之ECC材料，其抗壓應力超過50 MPa、抗拉應變量可達1-3%、且坍流度可達65公分。進一步，研發出五種高礦物摻料(Mineral Admixtures)的Green ECC配比，並探討其力學及流變性質之變化。結果顯示，提高飛灰量能增加Green ECC的韌性，但是會降低力學強度及工作性；相較於僅使用高量飛灰的配比，複合爐石粉於配比中，能改善流變性質，增進工作效能，提高早期強度，並保有優良的拉力應變及撓曲變形韌性。
最後，探討ECC自癒合能力，以共振頻率(Resonant Frequency Test)、拉力試驗(Uniaxial Tensile Test)、以及SEM(Scanning Electron Microscope)來評估並觀察Green-ECC受到兩種不同程度破壞(Pre-Crack 0.5% and 1%)後，放置於三種不同環境下(包括水中、自然環境、以及乾燥環境)的自癒合程度。研究發現，所有配比在水中以及自然環境中皆有自癒合的行為發生。其中，共振頻率恢復程度方面，以高飛灰量的配比表現較好。而複合爐石粉的配比，其拉應力及勁度恢復程度較佳。

摘要(英)

The objectives of this research are to develop Engineered Cementitious Composites (ECC) using locally available materials, and to evaluate the self-healing behavior of ECC. The study starts by designing the mixture proportions using locally available materials in Taiwan. The effects of water binder ratio and mixing method on the mechanical and rheological properties (including tensile properties, compressive properties, and flexural properties) of the developed ECC are studied. The study successfully used the locally available materials such as cement, fly ash, silica sand, and superplasticizer etc., to develop the ECC with high flowability, ductility and strength. In particular, the compressive stress is over 50 MPa, tensile strain is up to 1-3%, and the slump flow can reach to 65 cm. Furthermore, five different mixture designs of Green-ECC with high volumes of mineral admixtures are developed. Experiments are carried out to evaluate their mechanical and rheological properties. The experimental results show that while Green-ECC with high volume of fly ash can enhance the tensile strain capacity, the compressive stress and workability are decreased. Compared to using only high volume of fly ash, the mixtures containing fly ash and slag can enhance the workability, early strength while maintaining excellent tensile strain capacity and flexural deflection capacity.
Investigations are carried out on self-healing capacities of ECC specimens with two different degrees of pre-crack (0.5% and 1%) and three different storage environments (including water, natural environment, as well as dry conditions). To quantify self-healing behavior of Green-ECC, the resonant frequency test and uniaxial tensile test (UTT) are conducted. In addition, Scanning Electron Microscope (SEM) with Energy Dispersive Spectroscopy (EDS) are used to observe and analyze the self-healing products. The test results reveal that all specimens of Green-ECC show self-healing behavior under water and natural environment. The specimens of high volume of fly ash exhibit the best self-healing performance in terms of the recovery ratio of the resonance frequency. The mixtures incorporating fly ash and slag show the best recovery with respects to tensile stress and stiffness.

關鍵字(中)

★ 韌性
★ 混凝土
★ 纖維
★ 自癒合
★ 應變硬化

關鍵字(英)

★ ECC
★ Fiber
★ strain hardening
★ self healing

論文目次

摘要 v
Abstract vii
誌謝 viii
目錄 x
圖目錄 xiii
表目錄 xviii
第一章緒論 1
1-1研究動機 1
1-2研究目的 2
1-3研究方法 3
1-4論文架構 3
第二章文獻回顧 5
2-1 ECC簡介 5
2-2 礦物摻料的應用 7
2-2.1礦物摻料 7
2-2.2礦物摻料於ECC的應用 11
2-3 混凝土自癒合現象 12
2-3.1自癒合簡介 12
2-3.2 ECC之自癒合研究 18
第三章實驗計畫 23
3-1材料 23
3-2配比設計 26
3-2.1 ECC配比本土化流程 26
3-2.2本土化ECC配比設計 29
3-2.3綠色ECC配比設計 30
3-3拌合方式 32
3-4實驗試體與設置 34
3-4.1力學試驗 34
3-4.2流變性質試驗 36
3-4.3自癒合實驗 39
3-4.3.1自癒合實驗流程 39
3-4.3.2預拉與拉力試驗 40
3-4.3.3共振頻率試驗 41
3-4.3.4材料分析儀器 43
3-4.3.5環境設置 44
第四章結果與討論 46
4-1纖維添加方式對ECC力學性質之影響 46
4-2水膠比對ECC力學性質之影響 51
4-3五種高礦物摻料ECC試驗之結果與討論 55
4-3.1不同配比的力學性質比較 61
4-3.1.1壓力實驗 61
4-3.1.2拉力實驗 62
4-3.1.3四點彎矩實驗 64
4-3.1.4綜合比較 66
4-3.2不同配比於各齡期之力學性質變化 68
4-3.2.1壓力實驗 68
4-3.2.2拉力實驗 71
4-3.2.3四點彎矩實驗 75
4-3.3流變性質結果與討論 78
4-4自癒合試驗結果與討論 82
4-4.1不同配比之自癒合結果 82
4-4.2不同養護環境之自癒合結果 87
4-4.3不同齡期之自癒合結果 91
4-4.4 SEM表面分析 92
第五章結論 99
References 103
附錄 109

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指導教授

洪崇展(Chung-chan Hung)

審核日期

2014-7-9

推文