建設 産業用 高品質 循環잔骨材의 乾式 生産시스템에 關한 實驗的 硏究 = An Experimental Study on the Development of Dry Process Production System of High Quality Recycled Fine Aggregate

다국어 초록 (Multilingual Abstract)

Recently, the recycling and reusing of construction and demolition waste concrete is urgently required because production quantity of construction and demolition waste concrete is greatly increased according to the rapid increasing of urban redevelopment project. On the other hand, the problem solution for demand and supply unbalance of fine aggregate is urgently required because of the restriction of collecting sea fine aggregate by intensification of environment influence evaluation and the shortage of river fine aggregate. Therefore, the utilization of high quality recycled fine aggregate using construction and demolition waste concrete as new fine aggregate for construction industry is urgently required to accomplish the middle and long scaled construction project without failure.
In this background, manufacture technology which can produce recycled fine aggregate from construction and demolition waste concrete has been developed already. However, washing method has the problem which poor quality, the environment pollution by washing water, production of micro powder sludge and necessity of expensive additional process for disposing micro powder sludge. On the other hand, heating and trituration method has problem which cost increase according to the establishment of heating equipment and restriction of a large quantity production, etc. So the development of dry manufacture technology of high quality recycled fine aggregate which efficient elimination of micro powder, improvement of productivity and quality and decrease of production cost are possible is urgently required. objective
Hence, the ultimate goal of this study is to develop dry process production system of high quality recycled fine aggregate by TS type sorting separator and gravity cyclone for the purpose of solving problem of demand and supply unbalance of construction fine aggregate and environment load. For this, in the second year, it was developed the technologies of pre-treatment, specific gravity separation and a dust collection process, and equipment according to production process of high quality recycled fine aggregate was complemented and improved by deducing for problems and improvement directions of high quality recycled fine aggregate system which was developed in the first year. In addition, problems and improvements of dry process production was deduced through quality evaluation of recycled fine aggregate which was produced in the work of pre-treatment and specific gravity. Eventually, this study developed a production process technology of high quality recycled fine aggregate for increasing productivity.
The contents and scope of the study are as follows.
For ultimate goal of this study, development of dry process production system of high quality recycled fine aggregate by TS type sorting separator and gravity cyclone, it is to develop high quality recycled fine aggregate production process technology.
? Development of pre-treatment, specific gravity separation, and dust collection process technology
？ Development of pre-treatment process technology
？ Development of specific gravity separation and dust collection process
? Development and improvement of equipment of high quality recycled fine aggregate by production process for advancing quality
？ Deduction of problems and improvement directions of high quality recycled fine aggregate system which was developed in the first year
？ Complement and improvement of high quality recycled fine aggregate by production process
? Deduction of Improvement direction of production system by elevating recycled fine aggregate`s quality produced by process
？ Quality evaluation of recycled fine aggregate`s produced by pre-treatment and specific gravity separation process
？ Deduction of problem and improvement direction of dry manufacturing system
The conclusions derived from the present experimental investigation are presented below.
The goal of study development in this year, development of production process technology of high quality recycled fine aggregate for increasing productivity, is as follows.
1) Development of pre-treatment, specific gravity separation, and dust collection process technology
To produce high quality recycled fine aggregate satisfying with target demand level in this study, pre-treatment`s process technology was developed after analyzing type of crush and sorting equipment, functioning principal and production quantity which is used in the inside and outside of the country. By improving revolution wing of specific gravity separation equipment of High-speed rotation impact type which was developed in 1st year, specific gravity separation technology whose grade, absolute dry density, water absorption ratio are improved was developed.
Also by designing and making dust collection equipment and exhaustion filter equipment, the dust collection process technology which is able to collect minute powder produced by specific gravity separation equipment of High-speed rotation impact type and minimize the minute powder into the air was developed
2) Development and improvement of equipment by production process of high quality recycled fine aggregate for advancing quality
It is developed dry manufacturing system including pre-treatment process composed crush and sorting equipment, specific gravity separation composed specific gravity separation equipment of High-speed rotation impact type, dust collection process composed centrifugal force minute powder collector, precipitation particle powder collector of sedimentation type and exhaustion filter equipment.
Also fine particle separation equipment was established to improve grade of recycled fine aggregate. To prevent clog of exhaustion filter and minimize production of scattering dust, vibrator was established in the of exhaustion filter equipment and capacity of exhaust fan was improved. And minute powder ventilation equipment was established and diameter of minute powder transfer tube was enlarged to enlarge a output increase of minute powder and extend machine service life.
3) Deduction of Improvement direction of production system with evaluating recycled fine aggregate`s quality produced by process
With evaluating quality of recycled fine aggregate by process produced in dry manufacturing system which is composed specific gravity separation equipment of High-speed rotation impact type and centrifugal force minute powder collector for high quality of the recycled fine aggregate, it is deduced problem that grade, density and water absorbtion ratio of the recycled fine aggregate.
For solving this problem, it is to improve grade of recycled fine aggregate by improving the crush and sorting equipment, specific gravity separation equipment of High-speed rotation impact type and establishing fine particle separation equipment as to improve the crush and separation efficiency of aggregate.
And it is to improve absolute dry density and water absorbtion of recycled fine aggregate by improving main body and revolution wing of specific gravity separation equipment of High-speed rotation impact type as to increase exclusion efficiency of mortar adhered in recycled fine aggregate.
The application plan and expectative effect of study development results about development of dry process manufacture and production system of high quality recycled fine aggregate using waste concrete are the follow
(1) It is possible to decrease environmental pollution by construction waste with reusing waste concrete of substantial amount as fine aggregate for concrete. Specially, it is considered that supplying and demanding imbalance problem for the construction can be solved by using of high quality recycled fine aggregate as fine aggregate for structure concrete
(2) Dry process production method of high quality recycled fine aggregate, developing through this study, has more excellent productivity and economic efficiency than existing recycled aggregate production method such as heating trituration and water treatment. Moreover, wash water and sludge were not produced and powder of dry condition which is easy to practical use as secondary product was produced, so it is possible to prevent additional environmental pollution by production of recycled fine aggregate.
(3) Recycled fine aggregate production system can be applied to aggregate production field such as powder separation process in producing crushed and river fine aggregate. Also, it is considered that powder, separated in dry condition, can be used various secondary product such as repair material.

목차 (Table of Contents)

• 제1장 서론 1
• 1.1 연구의 배경 및 필요성 1
• 1.2 연구의 목적 4
• 제2장 현장사용 골재의 수급 및 순환골재의 현장적용에 관한 동향 7
• 2.1 천연골재의 수급 실태 및 전망 7
• 2.1.1 골재의 종류 및 용도 7
• 2.1.2 골재 자원의 수급 추이 8
• 2.1.3 골재 품종별 소비 구조 10
• 2.1.4 골재의 부존량 실태 11
• 2.1.5 골재 수급 전망 (한국 건설산업 연구원 설문 조사 결과, 2003) 12
• 2.2 건설폐기물의 처리 및 재활용 실태 15
• 2.2.1 건설폐기물의 처리 체계 15
• 2.2.2 건설폐기물의 처리 방법별 처리 현황 15
• 2.2.3 건설폐기물 처리 업체 16
• 2.3 건설폐기물 재활용상의 문제점 20
• 2.3.1 건설폐기물 재활용 현황 20
• 2.4 건설폐기물 재활용 실태 조사 결과 21
• 2.4.1 순환골재 생산 실태 23
• 제3장 순환골재 품질 및 제조기술 40
• 3.1 순환골재 품질에 관한 연구동향 40
• 3.1.1 순환골재의 품질관리 필요성 40
• 3.2 순환골재의 제조기술 46
• 3.2.1 파·분쇄 기술 46
• 3.2.2 분급기술 52
• 3.2.3 선별기술 56
• 3.3 순환골재 생산 방식의 장단·점 62
• 3.3.1 가열마쇄방식 62
• 3.3.2 물세척 방식 65
• 3.3.3 풍력선별 방식 66
• 제4장 순환골재 생산공정 및 장치개발 68
• 4.1 전처리, 비중분리 및 집진공정 기술개발 68
• 4.1.1 전처리, 비중분리 및 집진공정기술의 개요 68
• 4.1.2 전처리 공정 기술개발 69
• 4.1.3 비중분리공정 기술개발 81
• 4.1.4 집진공정 기술개발 82
• 4.2 품질향상을 위한 고품질 순환모래 생산공정별 장치의 개발 84
• 4.2.1 고품질 순환모래 건식생산시스템 개발 84
• 4.3 건식생산시스템 주요 공정별 생산되는 순환모래의 품질평가 92
• 4.3.1 공정별 순환모래의 품질평가 결과 92
• 제5장 순환골재 생산시스템의 개선 및 고품질화 방안 102
• 5.1 고품질 순환모래 건식생산시스템의 개선 102
• 5.1.1 순환모래의 고품질화를 위한 개선장치 102
• 5.2 순환골재 생산시스템의 개선을 통한 순환골재 품질평가 110
• 5.2.1 순환골재 생산 시스템Ⅰ의골재 품질평가 결과 110
• 5.2.2 순환골재 생산 시스템Ⅱ골재 품질평가 결과 114
• 5.3 고품질 순환모래건식생산시스템의 문제점 도출 및 개선안 제시 118
• 5.3.1 건식생산시스템 장치의 보완 및 개선 119
• 제6장 종합결론 131
• 참고문헌 133