표제지
목차
ABSTRACT 8
제1장 서론 10
1.1. 연구 배경 및 목적 10
1.2. 연구내용 13
제2장 이론적 배경 14
2.1. 부식의 정의 14
2.2. 콘크리트 재료의 특성 및 구성 17
2.2.1. 콘크리트의 특성 17
2.2.2. 콘크리트의 구성 18
2.3. 철근콘크리트의 열화 20
2.3.1. 환경에 의한 콘크리트 열화 20
2.3.2. 철근콘크리트의 부식 26
2.4. 철근콘크리트 구조물의 부식 모니터링 29
2.4.1. 부식 모니터링의 중요성 29
2.4.2. 부식 모니터링 방법 29
2.5. 철근콘크리트 구조물용 부식 모니터링 센서 32
2.6. 철근콘크리트 구조물의 부식 방지법 34
2.6.1. 외부전원법(ICCP) 34
2.6.2. 희생양극법(SACP) 36
제3장 실험 방법 38
3.1. 시험편 및 센서 38
3.2. 실험 조건 43
3.3. 실험 장치 44
3.3.1. 항온·항습조 44
3.3.2. 멀티미터(multimeter) 및 기준전극(reference electrode) 44
3.3.3. 비저항 측정기(resistivity meter) 44
3.3.4. 분극 실험 장치 44
3.3.5. 음극방식 실험 장치 44
3.4. 실험 분석 및 평가 방법 47
3.4.1. 부식전위 측정 47
3.4.2. 부식속도 측정 47
3.4.3. 갈바닉전류(Galvanic & Macro-cell Current) 측정 49
3.4.4. 콘크리트 비저항 측정 51
3.4.5. 방식전위 및 방식전류 측정 52
3.4.6. 4시간 복극전위 측정 52
제4장 실험 결과 53
4.1. 콘크리트의 부식전위 측정 결과 53
4.2. 콘크리트의 부식속도 측정 결과 57
4.3. 콘크리트의 갈바닉전류 측정 결과 61
4.4. 콘크리트의 비저항 측정 결과 63
4.5. 콘크리트 방식전위 및 방식전류 측정 결과 65
4.6. 콘크리트의 4시간 복극전위 측정 결과 67
제5장 결론 68
참고 문헌 69
Table 2.1. Typical oxide ingredients of portland cement 18
Table 2.2. Expansion rate after reacting calcium sulfate 23
Table 2.3. The probability of corrosion by amount of chloride 30
Table 2.4. Overview of recent corrosion monitoring sensors 33
Table 3.1. Environment of experiments 43
Table 3.2. The probability of corrosion by corrosion rate 48
Table 3.3. Galvanic series for seawater 50
Table 3.4. The probability of corrosion by concrete resistivity 51
Fig. 1.1. View of the damaged splash & tidal zones in the marine bridge column 12
Fig. 2.1. Cycles between refining and corrosion 14
Fig. 2.2. Electrochemical model of corrosion in metal 15
Fig. 2.3. Typical polarization curve in metal 16
Fig. 2.4. Freeze and thaw disintegration 22
Fig. 2.5. Disintegration caused by sulfate attack 24
Fig. 2.6. Disintegration caused by alkali-aggregate reaction 25
Fig. 2.7. The breakdown of the passive layer and recycling chlorides 27
Fig. 2.8. Dissolved oxygen effect for concrete rebar 28
Fig. 2.9. The anodic and cathodic reactions 28
Fig. 2.10. Schematic formation of impressed current cathodic protection with MMO/Ti-mesh 35
Fig. 2.11. Typical polarization curve applying ICCP 35
Fig. 2.12. Schematic formation of sacrificial anode cathodic protection with Zn-mesh 36
Fig. 2.13. Typical Polarization culve applying SACP 37
Fig. 3.1. Schematic drawing of DMS-100 sensor 39
Fig. 3.2. Schematic drawing of GCM sensor 40
Fig. 3.3. Entire view of specimen 40
Fig. 3.4. Arrangement of GCM & DMS-100 sensor 41
Fig. 3.5. Arrangement of GCM, CorroWatch, ERE-20, diode sensors 41
Fig. 3.6. Varnishing of specimens 42
Fig. 3.7. View of specimens inside of thermo-hygrostat 42
Fig. 3.8. View of experiments 45
Fig. 3.9. View of power supplier & measuring experiment for ICCP 46
Fig. 3.10. Corrosion potential measurement of concrete 47
Fig. 3.11. Typical curve and plot by linear polarization 49
Fig. 3.12. Concrete resistivity measurements(Wenner technique) 51
Fig. 3.13. Example graph measured instant-off potential 52
Fig. 4.1. Variations of rebar potential with time at different cover thickness 54
Fig. 4.2. Variation of rebar potential with temperature 56
Fig. 4.3. Variations of CorroWatch rebar potential with time at different cover thickness 56
Fig. 4.4. Variations of corrosion rate with time in different chloride concentration 58
Fig. 4.5. Variation of corrosion rate with time at different temperature conditions 59
Fig. 4.6. Variations of corrosion rate and potential with time 60
Fig. 4.7. Variation of galvanic current with time at different cover thickness 62
Fig. 4.8. Variations of concrete resistivity at different temperature 64
Fig. 4.9. Variation of cathodic protection potential with temperature in 3wt% salt water for SACP & ICCP systems 66
Fig. 4.10. Variations of cathodic protection current with cover thickness in 3wt% salt water for SACP & ICCP systems (Log Scale) 66
Fig. 4.11. Variations of 4 hour depolarization potential with cover thickness in 3wt% salt water for SACP & ICCP systems 67