표제지

목차

I. 서론 12

1.1. 연구배경 및 목적 12

1.2. 연구내용 및 범위 14

1.3. 연구동향 15

1.3.1. 시멘트 혼화용 폴리머 EVA의 연구동향 15

1.3.2. 섬유를 활용한 연구동향 16

II. 이론적 배경 18

2.1. 폴리머 시멘트 콘크리트 18

2.1.1. 시멘트 혼화용 폴리머 18

2.1.2. 폴리머 필름의 메카니즘 19

2.1.3. EVA 재유화형 분말수지 20

2.2. 섬유보강 콘크리트 21

2.2.1. 섬유의 종류 및 특성 21

2.2.2. 섬유보강 콘크리트의 특성 22

III. 섬유보강 EVA 콘크리트의 물리·역학적 특성 24

3.1. 개요 24

3.2. 재료 및 방법 25

3.2.1. 사용재료 25

3.2.2. 공시체 제작 및 양생 31

3.2.3. 시험방법 34

3.3. 결과 및 고찰 39

3.3.1. 슬럼프 39

3.3.2. 공기량 41

3.3.3. 압축강도 42

3.3.4. 휨강도 48

3.3.5. 정탄성계수 54

3.3.6. 응력-변형률 58

3.3.7. 건조수축 61

3.3.8. 흡수율 65

3.3.9. 염소이온 투과저항성 71

IV. 섬유보강 EVA 콘크리트의 내구 특성 76

4.1. 개요 76

4.2. 재료 및 방법 77

4.2.1. 사용재료 77

4.2.2. 공시체 제작 및 양생 77

4.2.3. 시험방법 77

4.3. 결과 및 고찰 81

4.3.1. 동결융해저항성 81

4.3.2. 내마모성 94

4.3.3. 내충격성 100

4.3.4. 내산성 107

V. 섬유보강 EVA 콘크리트의 휨인성 117

5.1. 개요 117

5.2. 재료 및 방법 118

5.2.1. 사용재료 및 공시체 제작 118

5.2.2. 시험방법 118

5.2.3. 휨인성 평가 방법 120

5.3. 결과 및 고찰 121

5.3.1. 하중-처짐곡선 121

5.3.2. 휨인성지수 126

VI. 결론 130

참고문헌 133

ABSTRACT 143

Table 1. Physical properties of fibers 21

Table 2. Physical properties of normal portland cement 25

Table 3. Chemical compositions of normal portland cement 25

Table 4. Physical properties of aggregate 25

Table 5. Physical properties of EVA redispersible polymer powder 26

Table 6. Physical properties of fly ash 27

Table 7. Chemical compositions of fly ash 27

Table 8. Physical properties of polypropylene fiber 28

Table 9. Physical properties of steel fiber 29

Table 10. Physical properties of superplasticizer 30

Table 11. Physical properties of deforming agent 30

Table 12. Mix designs of EVA concrete reinforced PP fiber 32

Table 13. Mix designs of EVA concrete reinforced steel fiber 33

Table 14. Chloride ion permeability based on charge passed 37

Table 15. Results of slump and air content test 39

Table 16. Compressive strength of EVA concrete reinforced fiber 42

Table 17. Flexural strength of EVA concrete reinforced fiber 48

Table 18. Static modulus of elasticity of EVA concrete reinforced fiber 54

Table 19. Dry shrinkage strain of EVA concrete reinforced fiber 61

Table 20. Water absorption ratio of EVA concrete reinforced fiber 65

Table 21. Chloride ion penetration of EVA concrete reinforced fiber 71

Table 22. Weight reduction ratio by freezing and thawing resistance test 82

Table 23. Relative dynamic modulus of elasticity and durability factor by freezing and thawing resistance test 86

Table 24. Abrasion ratio of EVA concrete reinforced fiber 94

Table 25. Impact resistance of EVA concrete reinforced fiber 100

Table 26. Weight reduction ratio with immersed period of EVA concrete reinforced PP fiber 107

Table 27. Weight reduction ratio with immersed period of EVA concrete reinforced steel fiber 108

Table 28. Central deflection in initial cracking load and maximum load of EVA concrete reinforced PP fiber 121

Table 29. Central deflection in initial cracking load and maximum load of EVA concrete reinforced steel fiber 122

Table 30. Test results of flexural toughness index 126

Fig. 1. Distribution curve of aggregate size 26

Fig. 2. Scheme of chloride ion permeability test 38

Fig. 3. Compressive strength with EVA contents 44

Fig. 4. Compressive strength with PP fiber contents of EVA concrete 45

Fig. 5. Compressive strength with steel fiber contents of EVA concrete 47

Fig. 6. Flexural strength with EVA contents 50

Fig. 7. Flexural strength with PP fiber contents of EVA concrete 51

Fig. 8. Flexural strength with steel fiber contents of EVA concrete 53

Fig. 9. Static modulus of elasticity with EVA contents 55

Fig. 10. Static modulus of elasticity with fiber contents of EVA concrete 57

Fig. 11. Stress-strain curve with EVA contents 58

Fig. 12. Stress-strain curve with PP fiber contents of EVA contents 5.0% 59

Fig. 13. Stress-strain curve with steel fiber contents of EVA contents 5.0% 60

Fig. 14. Dry shrinkage strain with curing period of EVA contents 62

Fig. 15. Dry shrinkage strain with curing period of PP fiber contents on EVA contents 10% 64

Fig. 16. Dry shrinkage strain with curing period of steel fiber contents on EVA contents 10% 64

Fig. 17. Water absorption ratio with EVA contents 67

Fig. 18. Water absorption ratio with PP fiber contents of EVA concrete 69

Fig. 19. Water absorption ratio with steel fiber contents of EVA concrete 70

Fig. 20. Chloride ion penetration resistance with EVA contents 72

Fig. 21. Chloride ion penetration resistance with PP fiber contents of EVA concrete 74

Fig. 22. Chloride ion penetration resistance with steel fiber contents of EVA concrete 74

Fig. 23. Impact resistance test apparatus 79

Fig. 24. Weight reduction ratio with EVA contents in freezing and thawing 300 cycles 83

Fig. 25. Weight reduction ratio with PP fiber contents of EVA concrete in freezing and thawing 300 cycles 84

Fig. 26. Weight reduction ratio with steel fiber contents of EVA concrete in freezing and thawing 300 cycles 85

Fig. 27. Relative dynamic modulus of elasticity with freezing and thawing cycles of EVA contents 87

Fig. 28. Relative dynamic modulus of elasticity with freezing and thawing cycles of PP fiber contents on EVA contents 5.0% 88

Fig. 29. Relative dynamic modulus of elasticity with freezing and thawing cycles of steel fiber contents on EVA contents 5.0% 89

Fig. 30. Durability factor with PP fiber contents of EVA concrete 92

Fig. 31. Durability factor with steel fiber contents of EVA concrete 93

Fig. 32. Abrasion ratio with EVA contents 95

Fig. 33. Abrasion ratio with fiber contents of EVA contents 5.0% 98

Fig. 34. Drop number with EVA contents of final fracture 101

Fig. 35. Relationship between PP fiber contents and drop number 104

Fig. 36. Relationship between steel fiber contents and drop number 105

Fig. 37. Weight reduction ratio with immersed period of EVA contents 110

Fig. 38. X-ray diffraction analysis with EVA contents after curing age 42days 111

Fig. 39. Weight reduction ratio with immersed period of PP fiber contents on EVA contents 10% 112

Fig. 40. Weight reduction ratio with immersed period of steel fiber contents on EVA contents 10% 113

Fig. 41. X-ray diffraction analysis of EVA concrete reinforced fiber after curing age 42days 116

Fig. 42. Scheme of flexural toughness test 119

Fig. 43. Definition of toughness indexes according to ASTM C 1018 120

Fig. 44. Load-deflection curves with PP fiber contents of EVA contents 7.5% 124

Fig. 45. Load-deflection curves with steel fiber contents of EVA contents 2.5% 125

Fig. 46. Flexural toughness index with PP fiber contents of EVA contents 7.5% 128

Fig. 47. Flexural toughness index with steel fiber contents of EVA contents 7.5% 129

Photo 1. Shape of EVA redispersible polymer powder 27

Photo 2. Shape of fly ash 28

Photo 3. Shape of PP and steel fiber 29

Photo 4. Stress-strain test apparatus 35

Photo 5. Test apparatus of dry shrinkage 35

Photo 6. Micro-structure of polymer film in EVA content 10% by SEM 67

Photo 7. Comparison of micro-structure between E0-0 and PE4-1 by SEM 75

Photo 8. Micro-structure with EVA concrete by SEM 91

Photo 9. Specimen appearance with fiber contents of EVA concrete after abrasion test 99

Photo 10. Specimen appearance of EVA concrete reinforced fiber after impact resistance test 106

Photo 11. Surface of EVA concrete reinforced PP fiber immersed in 5% H₂SO₄ solution after curing age 42days 114

Photo 12. Surface of EVA concrete reinforced steel fiber immersed in 5% H₂SO₄ solution after curing age 42days 115

Photo 13. Photo of flexural toughness test 119