표제지
목차
Abstract 12
제1장 서론 14
제2장 이론적 배경 17
제1절 순환골재의 사용 현황 17
1. 건설 폐기물의 발생량 17
2. 건설폐기물의 처리현황 23
3. 순환골재의 발생량 28
4. 순환골재의 사용현황 32
제2절 순환 골재 활용의 문제점 35
제3절 순환 골재 사용의 국·내외 현황 37
1. 순환 골재의 국내 현황 37
2. 순환골재의 국외 현황 44
제3장 실험 장치 및 방법 55
제1절 실험장치 및 처리공정 55
1. 기본적 원리 57
2. 기술적 원리 60
3. 이중 스크린망 트롬멜 장치의 구성 63
4. 이중 스크린망 트롬멜 장치의 원리 65
제2절 실험재료 및 방법 72
1. 실험재료 72
2. 순환골재 생산 및 선별 효율 72
3. 순환골재의 pH 저감 74
제3절 순환골재의 pH 및 품질 평가 74
1. 순환골재의 pH 측정 74
2. 순환골재의 품질 평가 75
제4장 실험결과 및 고찰 77
제1절 시간당 처리능력 77
제2절 각 공정별 선별율 78
1. 피더부 인력선별에 의한 선별율 78
2. 부채살 진동스크린에 의한 선별율 82
3. 밀폐형 이중스크린망에 의한 선별율 85
4. 버킷선별기에 의한 가연성 폐기물 선별율 89
5. #7번 벨트콘베이어에 의한 선별율 92
6. 각 공정별 건설폐기물의 평균 선별율 99
제3절 순환골재의 품질 100
1. 이물질 함유량 100
2. 입도(체가름), 조립율 평가 101
3. 밀도(표건·절건) 및 흡수율 103
4. 함수율 및 실내(수정) CRB 시험 104
제4절 경제성 평가 106
1. 연료·전력·용수 사용량 106
2. 운반비 저감 효과 110
제5절 순환골재의 pH 저감 114
1. 순환골재의 pH 114
2. 순환골재의 pH 저감 조건 116
제5장 결론 123
참고문헌 125
국문초록 127
Table 2.1. Prediction of construction waste production 21
Table 2.2. Waste treatment amounts by waste disposal agents 25
Table 2.3. Number of waste disposal company 27
Table 2.4. Prediction of production of recycled aggregate 28
Table 2.5. Recycle aggregate production and its sale condition by reuse 30
Table 2.6. Variability of sale amounts of recycled aggregate by reuse 33
Table 2.7. Recycle status of construction waste by reuse 34
Table 2.8. Concerning criteria for soil pollution 38
Table 2.9. Standard of harmful substance contained in waste 39
Table 2.10. Results of long-term elution experiment for recycled aggregate 40
Table 2.11. Current status of techniques developed for recycled aggregate 42
Table 2.12. Techniques using carbonation reaction for neutralization of recycled aggregate 43
Table 2.13. Experimental result of environmental performance in Denmark 46
Table 2.14. Drainage layer of reinforced soil and anchor structure 48
Table 2.15. Results of elution experiment for recycled aggregate 51
Table 2.16. Results of elution experiment for recycled aggregate 52
Table 2.17. Techniques for recycled aggregate developed at foreign country 53
Table 4.1. Construction waste used in this study 72
Table 4.2. Photographs showing direct measuring methods for construction waste 73
Table 4.3. Average treatment capacity per hour of recycled aggregate system used in this study 77
Table 4.4. Average production and composition of woody and ferric substances sorted from construction waste by hand-picking 79
Table 4.5. Sorting rate of woody substance by hand-picking 80
Table 4.6. Sorting rate of ferric substance by hand-picking 81
Table 4.7. Average sorting rate of waste concrete by fan flesh vibration screen 83
Table 4.8. Sorting rates of waste concrete by fan flesh vibration screen 84
Table 4.9. Average sorting rate by duplex screen net and drum magnetic separator 86
Table 4.10. Sorting rate of sand by duplex screen net 87
Table 4.11. Sorting rate of ferric substance by drum magnetic separator 88
Table 4.12. Average sorting rate of combustible waste at bucket selector 90
Table 4.13. Sorting rates of combustible waste at bucket selector 91
Table 4.14. Average sorting rate at #7th belt conveyer and drum magnetic separator 94
Table 4.15. Sorting rate of woods at #7th belt conveyer 95
Table 4.16. Sorting rate of plastics at #7th belt conveyer 96
Table 4.17. Sorting rate of irons by drum magnetic separator at #7th belt conveyer 97
Table 4.18. Sorting rate of waste concrete(≤150㎜) at #7th belt conveyer 98
Table 4.19. Average sorting rates by each process used in this study 99
Table 4.20. Foreign matter contents in recycled aggregates prepared by new and conventional techniques 100
Table 4.21. Quality of recycled aggregate used as road subbase layer 101
Table 4.22. Grading and assembling rate of recycled aggregate 102
Table 4.23. Criteria for density and absorptance of recycled aggregate 103
Table 4.24. Density and absorptance of recycled aggregate depending on grading 103
Table 4.25. Water content of recycled aggregate sorted on grading 104
Table 4.26. Methods of modified CBR test for recycled aggregate 105
Table 4.27. Results of modified CBR test for recycled aggregate 105
Table 4.28. Quantity of fuel for supplying hot air to fan flesh vibration screen using auxiliary burner or generator 107
Table 4.29. Temperatures of air and waste measured at each process 107
Table 4.30. Electric consumption for operating recycle system 108
Table 4.31. Water consumption in recycle system 109
Table 4.32. Transport and loading charges of waste by distance 110
Table 4.33. Comparison of transportation costs of waste between new and conventional techniques for recycled aggregate 111
Table 4.34. Costs for assembling/disassembling facilities by distance 112
Table 4.35. Cost reduction by application of new system 112
Table 4.36. Cost for treatment of construction waste using new and conventional system by capacity on facilities 113
Table 4.37. pH of recycled aggregate prepared in this study 114
Table 4.38. pH of recycled aggregate after washing with water for a week 115
Table 4.39. Experimental factors for reducing pH of recycled aggregate 117
Table 4.40. pH of recycled aggregates treated with carbonated water under various experimental conditions 117
Table 4.41. pH of recycled aggregate after treated with carbonated water in duplex screen net trommel 121
Fig. 2.1. Annual amount of construction waste and its share in total amount of waste. 17
Fig. 2.2. annual variation of waste production 18
Fig. 2.3. Component ratio of waste 19
Fig. 2.4. Population share of each local government. 20
Fig. 2.5. Production of construction waste in each local government. 20
Fig. 2.6. Regional distributions in production of construction waste 21
Fig. 2.7. Prediction of construction waste production 22
Fig. 2.8. Amounts of construction waste treated by applicable methods 24
Fig. 2.9. Ratios of construction waste treated by applicable methods 24
Fig. 2.10. Treatment amounts of construction waste by disposal agents 26
Fig. 2.11. Treatment ratio of construction waste by disposal agents 26
Fig. 2.12. Distribution of waste disposal company in each local government 27
Fig. 2.13. Prediction of production of recycled aggregate 29
Fig. 2.14. Reusing ratio of construction waste as recycled aggregate 31
Fig. 2.15. Reusing ratio of high quality recycled aggregate 32
Fig. 2.16. Recycle ratio of construction waste by reuse 34
Fig. 2.17. Photograph showing soil pollution by high-akali leachate from recycled aggregate in Shihwa Lake (2008.11.9) 36
Fig. 3.1. Photograph showing the system for production of recycled aggregate 58
Fig. 3.2. Process chart for production of recycled aggregate 59
Fig. 3.3. Photographs of hoper and feeder 60
Fig. 3.4. Photographs of fan flesh vibration screen 61
Fig. 3.5. Front view and profile of duplex screen net 62
Fig. 3.6. Front view and photograph of bucket selector 63
Fig. 3.7. Squint plan of duplex screen net trommel 64
Fig. 3.8. Side view of duplex screen net trommel 68
Fig. 3.9. Side view of inner structure of duplex screen net trommel 68
Fig. 3.10. Front view of duplex screen net trommel 69
Fig. 3.11. Side view of duplex screen net trommel with spray system 70
Fig. 3.12. Detail side view of duflux screen net trommel 71
Fig. 4.1. Physical composition of woody and ferric substances sorted from construction waste by hand-picking 78
Fig. 4.2. Physical composition of waste concrete sorted by fan flesh vibration screen 82
Fig. 4.3. Physical composition of sorted materials by duplex screen net and drum magnetic separator 86
Fig. 4.4. Physical composition of combustible waste sorted at bucket selector 89
Fig. 4.5. Physical compositions of sorted materials at #7th belt conveyer 93
Fig. 4.6. Transportation costs of waste bv distance 111
Fig. 4.7. Cost evaluation for treating construction waste before and after application of new technique by capacity on facilities 113
Fig. 4.8. pH of recycled aggregate prepared in this study 115
Fig. 4.9. pH of recycle aggregate after washing with water for a week 116
Fig. 4.10. pH reduction of recycle aggregate by reaction time 118
Fig. 4.11. pH of recycled aggregate versus RPM of duplex screen net trommel 119
Fig. 4.12. pH of recycled aggregate versus injection volume of carbonated water 120
Fig. 4.13. pH of recycled aggregate before and after treatment with carbonated water measured by waste standard method 122
Fig. 4.14. pH of recycled aggregate before and after treatment with carbonated water measured by standard method for soil pollution 122