Controlled Low Strength Material for Emergency Restoration Using Bottom Ash and Gypsum

So-Yeon Lee; Hwan-Hee Yoon; Son Min; Kong Jin-Young; Hyuk-Sang Jung

doi:10.12814/jkgss.2018.17.2.019

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2018 Vol.17, Issue 2 Preview Page Next Page

Controlled Low Strength Material for Emergency Restoration Using Bottom Ash and Gypsum 저회와 석고를 활용한 지반함몰 긴급복구용 고유동성 채움재 연구

30 June 2018. pp. 19-31

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Abstract

Recently the ground subsidence which seriously weakens the safety of cities tends to increase. The purpose of this paper is to develop the materials by using industrial by-products for the application to emergency restoration process in case of ground subsidence. In this paper the laboratory tests including pH test, initial setting test, unconfined compressive strength test, and flow test were performed in order to evaluate the design properties of Controlled Low Strength Material (CLSM). The field test was carried out for evaluating the performance for the early strength of CLSM and the workability for emergency restoration. Test results showed that the strength will be too high to re-excavate the ground when the cement ratio is more than 4%. The optimum mixing ratio appears to be most effective when the mixing ratio of the bottom ash and the gypsum is approximately 50:50 and the cement content is 2%.

Keywords

Controlled low strength material

Bottom ash, Gypsum

Emergency restoration

Field test

최근 도시의 안전을 심각하게 저해시키는 지반함몰현상이 증가하는 추세에 있어 대책이 필요한 상황이다. 지반함몰 발생 시 긴급복구공법에 사용될 산업부산물을 활용한 뒤채움재를 개발하는 것이 본 연구의 목적이다. 이를 위해 유동성 채움재 설계기준에 의거하여 목표성능을 도출하였고, 플로우값, 일축압축강도, 초기응결시간, pH시험 등 실내시험평가를 통해 개발된 재료의 적용성을 검토하였다. 또한 현장실험을 통해 고유동성 채움재의 조기강도에 대한 성능검증과 긴급복구를 위한 시공성을 확인하였다. 평가결과 시멘트의 비율이 4% 이상일 경우 재 굴착이 가능한 장기강도보다 크게 측정되어 긴급복구목적에 적합지 않은 것으로 나타났다. 최적배합비는 저회와 석고의 비율이 약 50:50, 시멘트의 비율이 2%로 나타났다.

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Information

Publisher :Korean Geosythetics Society
Publisher(Ko) :한국지반신소재학회
Journal Title :Journal of the Korean Geosynthetics Society
Journal Title(Ko) :한국지반신소재학회 논문집
Volume : 17
No :2
Pages :19-31
Received Date : 2018-05-04
Revised Date : 2018-06-18
Accepted Date : 2018-06-19
DOI :https://doi.org/10.12814/jkgss.2018.17.2.019

Journal of the Korean Geosynthetics Society ISSN:2508-2876(Print) 2287-9528(Online) 한국지반신소재학회 논문집

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