논문 상세보기
pp.145-153
PURPOSES : In this study, to improve the quality and construction performance of backfill materials for road excavation and restoration, the basic properties of rapid-hardening materials and stone sludge are analyzed to propose an optimal mix design.
METHODS : To utilize rapid-hardening materials and stone sludge as controlled low-strength materials for pipeline construction in downtown areas, specimens were prepared for each compounding condition of fast-hardening materials. Flow, slump, and compressive strength tests were performed at various setting times. Subsequently, the physical and mechanical characteristics of the rapid-hardening backfill material for each mixing factor were analyzed.
RESULTS : When ultrafast hardening cement and stone sludge are used, a setting time exceeding 30 min is required for a water–binder (W/B) ratio of 200% or higher. Considering the economic feasibility of ultrafast hardening cement, a W/B of 300% is considered the most suitable when high-performance superplasticizer and retarders are mixed. A flow test was performed on the rapid-hardening backfill material and the results show that if the mixing time exceeds 10 min, then the fluidity decreases rapidly, which necessitates a higher amount of superplasticizer. When ultrafast hardening cement is used, the initial strength (based on 4 h) is 0.7 MPa or higher for all formulations at a W/B ratio of 300%, and the compressive strength decreases slightly as the amount of superplasticizer is increased by 0.1%.
CONCLUSIONS : Based on the fluidity and strength of the backfill material, which is composed of a rapid-hardening material and stone sludge, the most optimal performance is achieved when ultrafast-hardening cement with a W/B ratio of 300% is used in addition to a highperformance fluidizing agent 0.3% (wt./B) and retarder 0.2% (wt./B).
1. 서론
2. 기존 도로 굴착복구용 되메움재 문헌조사
3. 사용재료
3.1. 석분슬러지
3.2. 시멘트
3.3. 초속경 시멘트
3.4. 혼화제
3.5. 급결제
4. 초속경 시멘트를 사용한 되메움재의 유동성 평가
4.1. 초속경 시멘트를 사용한 되메움재의 배합
4.2. 초속경 시멘트를 사용한 되메움재의 유동성 시험방법
4.3. 초속경 시멘트를 사용한 되메움재의 유동성 시험 결과
5. 초속경 시멘트와 혼화제를 사용한 되메움재의물성 평가
5.1. 초속경 시멘트와 혼화제를 사용한 되메움재의 배합
5.2. 초속경 시멘트와 혼화제를 사용한 되메움재의 시험방법
5.3. 초속경 시멘트와 혼화제를 사용한 되메움재의 물성결과
6. 속경성 재료에 따른 되메움재의 물성 평가
6.1. 속경성 재료에 따른 되메움재의 배합표
6.2. 속경성 재료에 따른 되메움재의 물성 시험 결과
7. 결론
REFERENCES
