초록 ▼

○ 본 연구는 일반적인 레미콘사에서 사용 중인 보통포틀랜드시멘트(OPC)의 대체 혼화재인 고로슬래그미분말(GBFS)을 혼입한 경우 발생하는 콘크리트의 초기재령(1일, 3일) 저하 및 저온환경(5∼20℃)에서 압축 강도 저하를 OPC 100% 사용과 동등이상의 압축강도 재령확보을 위하여 혼화재의 원천소재 개발을 목표로 경제성을 고려한 산업부산물 및 산업폐기물의 혼합 조성을 통한 소성과정(500∼1,150℃까지)을 걸쳐 물리적 화학적 검증실험을 하였으며 조기 압축강도 발현성능과 저온 환경 하에서도 초기재령 압축강도향상의 성능을 가지는

○ 본 연구는 일반적인 레미콘사에서 사용 중인 보통포틀랜드시멘트(OPC)의 대체 혼화재인 고로슬래그미분말(GBFS)을 혼입한 경우 발생하는 콘크리트의 초기재령(1일, 3일) 저하 및 저온환경(5∼20℃)에서 압축 강도 저하를 OPC 100% 사용과 동등이상의 압축강도 재령확보을 위하여 혼화재의 원천소재 개발을 목표로 경제성을 고려한 산업부산물 및 산업폐기물의 혼합 조성을 통한 소성과정(500∼1,150℃까지)을 걸쳐 물리적 화학적 검증실험을 하였으며 조기 압축강도 발현성능과 저온 환경 하에서도 초기재령 압축강도향상의 성능을 가지는 시멘트자극제, 고로슬래그미분말 자극제, 저온환경 증진재의 Smart 고로슬래그미분말(SBFS)을 개발하였다. 이에 소성에 필요한 시작품인 실험용 KILN(1,350℃까지 소성)을 자체 설계 및 제작을 완료하였으며, 원천소재 소성 온도별 SBFS 시제품에 대한 화학분석 및 미세 성분분석을 통하여 실험검증을 하였다. 또한 레미콘 실용화 단계를 위하여 기존 레미콘 단가 동등 이하의 경제성을 고려한 Smart 고로슬래그미분말의 치환율을 10∼30% 범위, 콘크리트 28일 압축강도 21∼30MPa 범위, 콘크리트 기중 양생온도 5∼20℃ 환경조건으로 설정하여 저탄소 콘크리트 배합설계를 통한 SBFS 혼입 저탄소 콘크리트로 제작된 구조체 콘크리트 코어 초기재령 압축강도 실험평가를 실시한 결과 OPC 100% 사용 콘크리트 대비 1일, 3일의 압축강도 동등이상의 결과로 저탄소 콘크리트를 개발하였으며, 이에 Smart 고로슬래그미분말을 적용한 저탄소 레디믹스트 콘크리트 경제성 및 CO₂ 원단위 산정을 실시한 결과 기존 레미콘 단가 이하의 경제성을 확보하였고 OPC 100% 사용 콘크리트 대비 레미콘 CO₂22

Abstract ▼

Ⅳ. Result of Research & Development
Development of Solid solution clinker which can decrease environment load at a high level by using Titan-gypsum and DWTS was carried out to develop raw materials which is different from previously studied industrial by-product mix binder. as a result of researc

Ⅳ. Result of Research & Development
Development of Solid solution clinker which can decrease environment load at a high level by using Titan-gypsum and DWTS was carried out to develop raw materials which is different from previously studied industrial by-product mix binder. as a result of research on the physical, chemical property such as hydration reaction mechanism, strength of mortar and durability of concrete, it came to a conclusion as follows.
1. Physical, chemical property analysis of all sorts of inorganic stimulus agent was conducted. through this result, in case of GBFS, 5% mixing ratio of NaOH which is alkali stimulant showed the best result. in case of OPC, 2% mix of NaSCN which is ionic and 0.02% mix of TEA showed the best result. NaOH and NaSCN was selected as a role of simultaneous stimulant. Thus, common ground of element which can stimulates GBFS and OPC at the same time was found to be a particulate material which is above pH 10 and contains certain amount of SO₃, Al₂O₃, CaO.
2. As a simultaneous stimulative materials, Titan-gypsum, limestone as industrial by-products and DWTS as industrial waste was selected as a result of all sorts of inorganic stimulus agent. The three raw materials selected for the source material to be developed (Titan-gypsum, DWTS and limestone) were repeatedly mixed according to their respective levels of experimental factor and fired in a simplified electric furnace (600℃∼1,050℃), as per the mixing ratio of each admixture. As a result of the experimental testing depending on the factor level, a source material was developed that can be mixed with GBFS to achieve the early-age (1-day and 3-day) of mortar and a compressive strength of 100% when used as cement stimulant, GBFS stimulant, and strength improvement agent in a low-temperature environment compared to mortar using 100% OPC. This newly developed material was then named as smart GBFS (SBFS). Is is a differentiated product development to a domestically developed stimulus agent.
3. Appropriate mixing ratio of raw material which stimulates GBFS and OPC at the same time was found, qualitative and quantitative analysis of hydration products was conducted. As a result, It was established that in case of OPC stimulation, a quantity of SO4^2- precipitation accelerated early hydration by adsorbing to Al₂O₃ active component out of GBFS. It was also established that in case of GBFS, CA,C₁₂A₇ catalyze early hydration by follows; CA,C₁₂A₇ is a main component of quick-setting cement and it catalyze early hydration of GBFS and commonly when the hydration of CaO it precipitate Si, Al ion by destroying oxide film on the surface of GBFS particle from early hydration step by a strong alkali of Ca(OH)₂.
4. In the physical performance evaluation of developed source material, existing alkali stimulant and concrete, it showed excellent compressive strength during 1 day to 28 days in comparision with OPC. Especially, In the experiment of pure GBFS which OPC is not included, alkali stimulant was excellent during 1 day to 7 day but source material mixed GBFS showed better compressive strength after 14 days. It was found to be possible to commercialize as single product.
5. For the performance evaluation of SBFS mixed concrete in accordance with curing temperature, comparative target was set as Plain specimen which 100% OPC was used and OPC 70% + GBFS 30% specimen. SBFS replacement ratio was 7% as an optimal and curing temperature was set up as (20, 10, 5)℃. As a result of Compressive strength measurement, in case of age 1 and 3, it showed 102.3%∼105.6% according to curing temprature. Especially, as aging period passes, strength was continuously increased so it was found to demonstrate very excellent mechanical property.
6. By manufacture of Pilot Plant which mass production of raw material is possible, it will carry out a role as catalyst to all sorts of source material development, which is out of existing mixing method in accordance with securement of equipment for experiment for the solid solution development.
7. Durability evaluation of smart GBFS (SBFS) concrete through real production at remicon plant for commercialization was conducted. As a result, in case of adiabatic temperature rise test, it was found that there was no temperature rise according to early hydration in comparison with OPC. In case of drying shrinkage variation test, it showed decrease according to long age progress. In case of carbonation resistance, it showed excellent result so it was confirmed to be applicable to reinforced concrete structure.
8. As a result of proceeding safety examination (Free-lime) according to firing temperature of source material, it showed 50%∼85.5% reduction effect of Free-lime in comparison with OPC. By this result, safety on the expansion property and cracking was confirmed and there was no problem on drawing process at SILO long-term storage.
9. Based on the development process of source material of Smart GBFS (SBFS), unit blast furnace slag plant CO₂ evaluation was completed firstly in Korea. CO₂ emission evaluation/test of SBFS at whole process, economic evaluation/test of RC structure apartment construction period and SBFS mixed concrete structure was completed. Through this result, It can be regarded to have applicable high academic value.
10. Smart GBFS (SBFS) application green technology is judged to be on a mature stage by following quantitative evaluation; construction expense reduction, shortening of construction time, CO₂ reduction effect. This evaluation was conducted in case of applying low-carbon concrete, which is matchable for application technology that is necessary for green technology certification about low-carbon concrete manufacture technology, to a construction of reinforced concrete structure.

목차 Contents

• 표 지 ... 1
• 제 출 문 ... 2
• 보고서 요약서 ... 3
• 요 약 문 ... 4
• S u m m a r y ... 9
• Table of Contents ... 16
• 목 차 ... 18
• LIST OF TABLE ... 20
• LIST OF FIGURE ... 25
• 제 1장 연구개발 개요 ... 28
• 제 1절 연구개발의 필요성 ... 30
• 제 2절 연구목표 및 범위 ... 33
• 1. 연구 목표 ... 33
• 2. 연구 범위 ... 34
• 제 2장 국내외 기술개발 현황 ... 35
• 제 1절 국내외 관련기술 및 산업동향 ... 35
• 1. 국내 고로슬래그 산업동향 ... 35
• 2. 국외 기술개발 현황 ... 37
• 3. 국내 기술개발동향 ... 39
• 제 2절 국내외 기존 기술과의 차별성 ... 41
• 1. 고로슬래그미분말 혼입 콘크리트의 조기강도 발현 기술 ... 41
• 2. 국내외 기술과의 차별성 ... 42
• 제 3장 연구개발 수행 내용 및 결과 ... 43
• 제 1절 연구개발 추진 전략 및 방법 ... 43
• 1. 연구개발 추진전략 ... 43
• 2. 연구 개발 추진방법 ... 44
• 제 2절 종류별 무기계 자극제 첨가에 따른 모르타르의 특성 분석 ... 45
• 1. 개요 ... 45
• 2. 실험계획 ... 45
• 3. 종류별 무기계 자극제의 물리적 특성 분석 ... 48
• 4. 결 론 ... 67
• 제 3절 알칼리성 무기계 자극제의 개발 및 수화 특성 ... 68
• 1. 개요 ... 68
• 2. 실험 계획 ... 68
• 3. 원천소재 재료의 특성 ... 71
• 4. 원천소재의 물리적 성능 및 화학적 특성 분석 ... 76
• 5. 주거환경에서의 인체 유해성 검토 ... 104
• 6. 알칼리성 무기계 자극제를 이용한 SBFS 모르타르 성능평가 ... 107
• 7. 알칼리성 무기계 자극제를 이용한 SBFS 콘크리트 성능평가 ... 133
• 8. SBFS 저탄소 콘크리트의 실용화 검증 Mock-up Test ... 156
• 9. 알칼리성 무기계 자극제를 이용한 SBFS 저탄소 콘크리트의 CO2 배출량 및 경제성 평가 ... 182
• 제 4절 원천소재 제조용 Pilot Plant 제작 ... 212
• 1. 개요 ... 212
• 2. 원천소재 제조용 Pilot Plant 제원 및 성능 ... 213
• 3. Pilot Plant 소성에 의한 화학분석 및 미세분석 ... 220
• 제 5절 종합 결론 ... 226
• 제 4장 연구성과 요약 및 기대효과 ... 231
• 제 1절 개별 연구성과 ... 231
• 제 2절 주요 연구성과 및 대외기여도 ... 242
• 제 3절 기술개발성과의 기대 효과 ... 246
• 제 5장 연구개발 결과의 활용 계획 ... 253
• 제 1절 연구성과의 활용 계획 ... 253
• 참고문헌 ... 256
• [부록] 정량적 성과목표 ... 264
• 끝페이지 ... 272