산업부산물 활용 무기결합재의 쏘일네일링 그라우팅 재료 적용성 평가
Evaluation of the Applicability of Inorganic Binders Using Industrial Byproducts as Soil Nailing Grouting Materials
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초록
최근 탄소중립 및 친환경 기술요구가 증대됨에 따라 우리나라 또한 관련 기술 수요가 높아지고 있다. 이러한 기술 수요 변화에따라 본 연구에서는 산업부산물을 활용한 쏘일네일링 그라우팅용 무기결합재를 개발하고 현장 적용성을 평가하였다. SP(슬래그분말) 및 HCFA(고칼슘 저품위 플라이애시)를 사용하여 2종류의 무기결합재를 개발하였다. 개발된 무기결합재는 시멘트의70%를 산업부산물로 대체하였으며, 두 종류의 무기결합재 모두 재령 28일 압축강도가 기준강도인 24MPa을 초과하는 것으로나타나, 그라우트 재료로서의 활용 가능성을 확인하였다. 또한 급결제 사용에 따른 압축강도 측정 결과 모두 28일 압축강도기준을 상회하였으나, 급결제 사용량이 증가할수록 강도가 감소하는 것으로 나타났다. 해당 결과를 바탕으로 2차례 현장인발시험을 수행한 결과, 배합시험에 따른 압축강도는 재료에 따라 상당한 차이(34.4 ~ 43.8MPa)가 발생하였음에도 불구하고, 평균 인발하중은 272.33 ~ 278.21kN/ea로 유사한 결과를 나타내었다. 결론적으로, 일련의 실험연구를 통해 본 연구에서개발한 2종류의 시멘트 경감형 무기결합재는 쏘일네일링 그라우트재로 활용할 수 있음이 확인되었다.
Abstract
As the demand for carbon neutrality and eco-friendly technologies has increased recently, Korea is also experiencing a high demand for related technologies. In response to these changes in technological demand, this study developed inorganic binders using industrial by-products for soil nailing grouting and evaluated their field applicability. Two types of inorganic binders were developed using SP (slag powder) and HCFA (high-calcium low-quality fly ash). The developed inorganic binders replaced 70% of cement with industrial by-products, and both two types were found to have a 28-day compressive strength in excess of the standard strength of 24MPa, showing their potential for use as grouting materials. Additionally, compressive strength measurements with the use of set accelerators all exceeded the 28-day compressive strength standard. However, it was found that the strength decreased as the used amount of accelerator increased. Based on these results, two field pull-out tests were conducted. Although the grout compressive strengths varied significantly between materials (34.4 ~ 43.8 MPa), the average pull-out loads were similar, ranging from 272.33 to 278.21 kN/ea. These results showed the strong potential of the two types of inorganic binders developed in this study for use as soil nailing grouting materials.
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