고로슬래그 미분말과 순환 잔골재 및 기능성 미분말을 사용한 무 시멘트 벽돌개발 = Development of Zero-Cement Brick Using Blast Furnace Slag Powder, Recycled Fine Aggregates and Functional Fine Particle

다국어 초록 (Multilingual Abstract)

ABSTRACT

Development of Zero-Cement Brick Using Blast Furnace Slag Powder, Recycled Fine Aggregates and Functional Fine Particle

Today, the enormous amount of construction waste generated at the last stage of the life cycle of concrete structures affects the global environment so much. Hence, it is required domestically and internationally to transform the construction industry to an environment-friendly structure to build a Green Growth system that will realize the sustainable development with a less environmental load. Therefore, this research considers the Zero Cement Brick that uses no cement at all but only Blast Furnace Slag Powder (hereafter referred to as BS) and Recycled Aggregates (hereafter referred to as RA). As a quality improvement plan of mortar that will be used to produce the Zero Cement Brick, this research examines the quality improvement effect in accordance with varying functional fine particle species and the substitution. And, by proposing the optimal application plan through this, this research intends ultimately to contribute to reducing the CO2 emission by significantly reducing the cement usage, and also to contribute to developing the environment-friendly resource recycle application technology that recycles waste and the economical technology that will solve the resource shortage issue and the energy issue. Hence, as functional fine particles for mortar, to develop the Zero Cement Brick, we use many materials such as Fine Particle Cement (hereafter referred to as FC) that was separated with high fineness from the cement manufacture process, Waste Gypsum (hereafter referred to as WG) that is created as a by-product in the fertilizer manufacture process, Recycled Aggregates Powder (hereafter referred to as RP) that is the collected dust in the RA manufacture process, Firing Recycled Aggregates Powder (hereafter referred to as FRP) that is the plasticized dust of the RA manufacture process, and Emulsion Waste Oil (hereafter referred to as EWO). These are mixed in a certain substitution with respect to BS, for the purpose of activating hydration reaction and alkali stimulation. Then, we tried to analyse the characteristics at the aspect of compressive strength and absorption ratio, which are quality specifications of mortar products like Brick. We also tried to draw the optimal mixing ratio for the resource recycling Zero Cement Brick production, through a brick mock-up test with W/B variation, EWO substitution, and the complex-substitution of Crush Fine Aggregates (hereafter referred to as CA) and RA. The result of experiment can be summarized as follows:

1) Because of the non-hardening characteristic of the mortar, to be used for producing the RA-using BS Brick, the flow value decreased as the mixing ratio increased, but increased as the FC & WO substitution increased while showed a decreasing trend for cases of WG, RP, FRP. The air amount grew as the mixing ratio increased, and, decreased as the functional fine particle substitution increased except WG.

2) The mortar compressive strength showed, for the standard curing, a slightly overall decreasing trend as the mixing ratio increased. And, the strength increased as the FC and WG substitution increased while showing a decreasing trend for cases of RP and FRP. As the WO substitution increased, the strength increased at the mixing ratio of 1 : 7, but showed a decreasing trend again for other mixing ratios. In the case of vapor curing, higher strength was exhibited than in the standard curing, but a similar trend of strength was confirmed.

3) The mortar absorption ratio showed an increasing trend overall as the mixing ratio increased. As the FC, RP, FRP substitution increased, it showed a decreasing trend because the fine particles fill the internal gaps, but it was a little higher for the WG case. In the case of WO, as the substitution increased, the absorption ratio showed a substantially dropping trend, because of the gap filling effect caused by saponification.

4) As for the W/B variation, the compressive strength of the RA-using BS Brick showed an increasing trend as the W/B increased to 35%, but above 35 % it showed a decreasing trend, while the absorption ratio showed the opposite trend to the compressive strength, exhibiting the lowest absorption ratio at W/B 35 %. The absorption ratio failed to satisfy the requirement at all levels because of the high absorption ratio of RA. The compressive strength showed a decreasing trend as the EWO substitution increased, irrespective of the material age, and satisfied the KS compressive strength requirement at all levels. The absorption ratio showed a gradually decreasing trend, as the EWO substitution increased, because of the gap filling effect caused by saponification, and satisfied the absorption ratio requirement at EWO above 1 %.

5) The compressive strength, in accordance with the complex-substitution of CA and EWO, satisfied at all levels the KS C-type class 2 Brick requirement. As the CA substitution varied, in the case of 3 day material age, the compressive strength was a little high at CA 20 %, but on the contrary, was high at CA 0 % in the case of 7 day material age. As the EWO substitution increased, the compressive strength showed a slightly but gradually decreasing trend, irrespective of material age. The absorption ratio decreased as the CA and EWO substitution increased, because of the decrease of RA amount and the internal gap filling effect of the Brick, and it was shown to satisfy the absorption ratio requirement at CA above 20 % and EWO above 1 %.

6) The analysis of the standard expense of a usual cement brick and the Zero Cement Brick shows that the Zero Cement Brick is able to secure both quality and economy because it gives the cost reduction of 3 573 Won per 1 000 bricks, considering the CO2 emission ratio.

In summary, as a plan of safety rate secure and quality improvement to apply to the Zero Cement Brick usin

목차 (Table of Contents)

• 목 차
• 1. 서 론
• 1.1 연구배경 및 목적
• 1.2 연구범위 및 방법
• 1.3 연구동향
• 2. 이론적 고찰
• 2.1 고로슬래그 미분말
• 2.1.1 고로슬래그 미분말의 개요
• 2.1.2 고로슬래그 미분말의 품질규정
• 2.1.3 고로슬래그 미분말의 물리·화학적 특성
• 2.1.4 고로슬래그 미분말의 잠재수경성 반응
• 2.2 순환골재
• 2.2.1 순환골재의 생산
• 2.2.2 순환골재의 품질규정
• 2.2.3 순환골재의 특성
• 2.2.4 순환골재의 수화반응성과 알칼리 용출
• 2.2.5 순환골재 미분말
• 2.3 무 시멘트 모르타르 및 콘크리트
• 2.3.1 무 시멘트 콘크리트의 연구동향
• 2.3.2 무 시멘트 콘크리트 수화반응
• 2.3.3 무 시멘트 콘크리트 특성
• 2.3.4 무 시멘트 콘크리트 문제점
• 2.3.5 무 시멘트 콘크리트 적용사례
• 3. 실험계획 및 방법
• 3.1 실험계획
• 3.1.1 모르타르 실험
• 3.1.2 벽돌제조 실험
• 3.2 사용재료
• 3.2.1 고로슬래그 미분말
• 3.2.2 순환잔골재 및 순환골재 미분말
• 3.2.3 부순잔골재
• 3.2.4 미분시멘트
• 3.2.5 폐석고
• 3.2.6 소성 순환골재 미분말
• 3.2.7 폐식용유 및 유화처리 된 정제식용유
• 3.3 실험방법
• 3.3.1 모르타르 실험방법
• 3.3.2 벽돌제조 실험방법
• 4. 벽돌 제작용 모르타르의 품질향상
• 4.1 서 언
• 4.2 실험결과
• 4.3 모르타르의 물성평가
• 4.3.1 굳지 않은 모르타르의 특성
• 4.3.2 경화 모르타르의 특성
• 4.4 최적재료 조합 및 배합비 도출
• 4.4.1 상호관계
• 4.4.2 종합분석
• 4.5 소 결
• 5. 벽돌제조 Mock-up Test
• 5.1 서 언
• 5.2 실험결과
• 5.2.1 W/B 변화
• 5.2.2 유화처리 된 정제 식용유 치환
• 5.2.3 부순잔골재 및 EWO 복합치환
• 5.3 W/B 변화에 따른 벽돌의 품질특성
• 5.3.1 압축강도 및 흡수율
• 5.3.2 상호관계
• 5.4 EWO 및 CA 사용에 따른 품질향상 방안
• 5.4.1 EWO 치환율 변화에 따른 벽돌의 품질향상
• 5.4.2 CA 및 EWO 복합치환에 따른 벽돌의 품질향상
• 5.5 경제성 분석
• 5.5.1 사용재료에 따른 일위대가
• 5.5.2 CO2 저감에 따른 비용절감
• 5.5.3 CO2 배출비를 고려한 일위대가
• 5.5.4 LCCO2(생애주기 이산화탄소) 평가
• 5.6 소결
• 6. 결 론
• 참 고 문 헌
• ABSTRACT