固著於矽膠之枯草芽孢桿菌對 ECC 耐久性能的影響

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呂伊凡(Irfan Prasetyo Loekito) 查詢紙本館藏

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土木工程學系

論文名稱

固著於矽膠之枯草芽孢桿菌對 ECC 耐久性能的影響
(The influence of bacillus subtilis immobilized in silica gel on durability performance of ECC)

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摘要(中)

工程水泥基複合材料（ECC）作為高性能材料，通過改變粉煤灰含量、添加新型纖維、添加強添加劑化合物、摻入殺菌劑等多種方法來提高性能。開發ECC技術的目的不僅僅是提高機械性能，還包括確保耐久性能。用於評估耐久性能的特徵之一是使用壽命能力。為了延長ECC的使用壽命，必須提高一些性能，例如氯化物侵入和耐腐蝕性。為了實現高耐久性能，本研究正在研究將枯草芽孢桿菌摻入 ECC 中。為了使細菌在 ECC 混合物的惡劣環境中存活，在固定過程中使用了矽膠。在本研究中，細菌固定化矽膠的含量從 5%、10% 和 15% 不等。結果表明，利用固定在矽膠中的枯草芽孢桿菌提高了耐久性能，尤其是在乾燥收縮、氯化物擴散性和耐腐蝕性方面。

此外，ECC 的使用壽命可以通過使用本研究的表面氯化物濃度和表觀擴散係數來估算。使用有效時間方法確定時間相關的減少係數 m。由於計算的擴散係數隨時間的減少對使用壽命預測有很大影響，因此還必須知道擴散和時間相關的減少係數是如何獲得的。

摘要(英)

As the high-performance material, engineered cementitious composite (ECC) has developed with many methods to improve the properties, such as changing the fly ash content, adding new type of fiber, adding strong additive compound, and incorporating with bacteria agent. The objective of developing ECC technology was not just about improving mechanical qualities, but also about ensuring the durability performances. One of the characteristics used to assess durability performance is service life ability. To extend the service life of ECC, some properties have to be improved, such as chloride ingress and corrosion resistance. In order to achieve high durability performance, the incorporation of bacillus subtilis into the ECC is being examined in this study. To keep bacteria alive in the harsh environment of the ECC mixture, silica gel is employed in the immobilization procedure. In this study, the content of bacteria immobilized silica gel varies from 5%, 10%, and 15%. The results reveal that utilizing bacillus subtilis immobilized in silica gel increases the durability performances, especially on drying shrinkage, chloride diffusivity, and corrosion resistance.
Furthermore, the service life of ECC can be estimated by using surface chloride concentration and apparent diffusion coefficient from this research. The time-dependant reduction coefficient, m, was determined using effective time methods. Since the reduction of calculated diffusion coefficient with time has great impact on service life prediction, it is imperative to also know how the diffusion and time-dependant reduction coefficient were obtained.

關鍵字(中)

★ 枯草芽孢桿菌
★ 耐久性
★ 氯化物擴散
★ 腐蝕
★ ECC

關鍵字(英)

★ ECC
★ Durability
★ Bacillus Subtilis
★ Chloride Diffusion
★ Corrosion

論文目次

Abstract i
摘要 ii
Acknowledgement iii
Table of Contents iv
List of Figures v
List of Tables vii
Chapter 1 Introduction 1
1.1 Research Background 1
1.2 Research Objectives 2
1.3 Research Scopes 2
1.4 Research Flowchart 2
Chapter 2 Literature Review 5
2.1 Nature of Reinforced Concrete Deterioration 5
2.2 Reinforced Concrete Deterioration Phases 6
2.3 Mechanism of Reinforcement Corrosion 6
2.4 Chloride Penetration Mechanism 8
2.4.1 Sorptivity or Surface Absorption 8
2.4.2 Diffusion 8
2.4.3 Chloride Binding 9
2.4.4 Wicking Action 9
2.4.5 Dispersion 9
2.4.6 Permeation 9
2.5 Chloride Diffusion 10
2.5.1 Diffusion Reduction Coefficient 12
2.6 Chloride Penetration Test 14
2.7 Service Life Estimation 16
2.8 Durability of Engineered Cementitious Composite 16
2.8.1 Transport Properties of ECC under Chloride Exposure 17
2.8.2 Corrosion Resistence Performance of ECC 17
2.9 Effect of Bacteria on Reinforced Corrosion 19
Chapter 3 Research Methodology 21
3.1 Research Program 21
3.2 Materials 24
3.2.1 Portland Cement 24
3.2.2 Fly Ash 24
3.2.3 Silica Sand 25
3.2.4 Polyvinyl Alcohol Fiber 26
3.2.5 Bacteria Specification 26
3.3 Bacterial Stock Preparation 27
3.3.1 Viability of Bacteria 27
3.3.2 Culturing of Bacteria 28
3.3.3 Immobilization of Bacteria 30
3.4 Mix Design 31
3.5 Chloride Penetration Test 33
3.5.1 Specimens Grinding 34
3.5.2 Determination of Chloride Content 35
3.5.3 Determination of Chloride Depth 37
3.5.4 Chloride Penetration Profile 38
3.5.5 Surface Chloride (Cs) and Apparent Diffusion (Dapp) Determination 38
3.5.6 Calculation of Diffusion Reduction Coefficient 39
3.5.7 Service Life Prediction 39
3.6 Accelerated Corrosion 39
3.6.1 Specimen Preparation 39
3.6.4 Gravimetric Weight Loss 40
3.6.2 Design of Targeted Corrosion 41
3.6.3 Test Setup for Accelerated Corrosion 42
3.7 Drying Shrinkage 44
3.8 Survival of Bacteria 46
Chapter 4 Results and Discussion 49
4.1 Survival of Bacteria in ECC Mixture 49
4.2 Drying Shrinkage 50
4.3 Microstructural Observation 52
4.4 Experimental Data of Bulk Diffusion 55
4.4.1 Chloride Penetration Depth 55
4.4.2 Chloride Profile of Experimental Data 56
4.4.3 Dapp and Cs Determination 59
4.4.4 Determination of m and D28 Values 64
4.5 Corrosion Resistance 66
4.5.1 Distribution of Rust Production-Induced Crack 67
4.5.2 Mass Loss and Actual Corrosion 68
4.5.3 Relationship between Diffusion and Corrosion 72
4.5.4 Relationship between icorr and iapp 72
4.6 Service Life Prediction 73
4.6.1 Estimation the Instataneous Diffusion Coefficient 73
4.6.2 Surface Chloride Estimation 74
4.6.3 Service Life Estimation 76
Chapter 5 Conclusions and Suggestions 81
5.1 Conclusions 81
5.2 Suggestions for Future Study 82
References 83

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指導教授

黃偉慶(Huang, Wei-Hsing)

審核日期

2023-1-10

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