Original Article

Econ. Environ. Geol. 2018; 51(4): 371-379

Published online August 31, 2018

https://doi.org/10.9719/EEG.2018.51.4.371

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

A Study on Changes in Heavy Metal Contents in Concrete Prepared Using Coal Ashes

Jinwon Lee1, Seung-Hyun Choi1, Kangjoo Kim1*, Seok-Hwi Kim2 and Bo-Kyung Moon3

1Department of Environmental Engineering, Kunsan National University, Kunsan 54150, Korea
2Institute for Advanced Engineering, Yongin 17180, Korea
3Korea Western Power, Co., Ltd., Taean 32140, Korea

Correspondence to : kangjoo@kunsan.ac.kr

Received: August 14, 2018; Accepted: August 29, 2018

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

In many countries, recycling coal ashes as backfill materials for subsided lands, abandoned mine tunnels, and road pipeline constructions by making low-strength concretes with minimal amounts of cement is frequently considered for massive treatment of coal ashes. This study investigates the variation of heavy metals in the concrete test pieces prepared for the cases of using only Portland cement as binding material, fly ash as a replacement of the cement, sand as aggregates, and disposed ashes in the ash ponds as a replacement of aggregates. Heavy metal contents were measured based on the aqua regia extraction technique following the Korean Standard for Fair Testing of Soil Contamination and the influences of each materials on the total heavy metal contents were also assessed. Results show that the cement has the highest Cu, Pb, and Zn concentrations than any other materials. Therefore, the test pieces show significant concentration decreases for those metals when the cement was replaced by fly ash. Ponded ash shows low concentrations relative to fly ash in most of the parameters but shows higher Cu and Ni, and lower Pb levels than the sand aggregate. In overall, heavy metal levels of the test pieces are regulated by mixing among the used materials. Test pieces prepared during this study always show concentrations much lower than the Worrisome Level of Soil Contamination (Area 1), which was designated by the Soil Environment Conservation Act of Korea.

Keywords low strength concrete, backfill, heavy metals, coal ashes, ponded ashed, cement

석탄재의 콘크리트 활용에 따른 중금속 함량변화 연구

이진원1 ·최승현1 ·김강주1* ·김석휘2 ·문보경3

1군산대학교 환경공학과, 2고등기술연구원, 3한국서부발전(주)

요 약

Article

Original Article

Econ. Environ. Geol. 2018; 51(4): 371-379

Published online August 31, 2018 https://doi.org/10.9719/EEG.2018.51.4.371

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

A Study on Changes in Heavy Metal Contents in Concrete Prepared Using Coal Ashes

Jinwon Lee1, Seung-Hyun Choi1, Kangjoo Kim1*, Seok-Hwi Kim2 and Bo-Kyung Moon3

1Department of Environmental Engineering, Kunsan National University, Kunsan 54150, Korea
2Institute for Advanced Engineering, Yongin 17180, Korea
3Korea Western Power, Co., Ltd., Taean 32140, Korea

Correspondence to:kangjoo@kunsan.ac.kr

Received: August 14, 2018; Accepted: August 29, 2018

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

In many countries, recycling coal ashes as backfill materials for subsided lands, abandoned mine tunnels, and road pipeline constructions by making low-strength concretes with minimal amounts of cement is frequently considered for massive treatment of coal ashes. This study investigates the variation of heavy metals in the concrete test pieces prepared for the cases of using only Portland cement as binding material, fly ash as a replacement of the cement, sand as aggregates, and disposed ashes in the ash ponds as a replacement of aggregates. Heavy metal contents were measured based on the aqua regia extraction technique following the Korean Standard for Fair Testing of Soil Contamination and the influences of each materials on the total heavy metal contents were also assessed. Results show that the cement has the highest Cu, Pb, and Zn concentrations than any other materials. Therefore, the test pieces show significant concentration decreases for those metals when the cement was replaced by fly ash. Ponded ash shows low concentrations relative to fly ash in most of the parameters but shows higher Cu and Ni, and lower Pb levels than the sand aggregate. In overall, heavy metal levels of the test pieces are regulated by mixing among the used materials. Test pieces prepared during this study always show concentrations much lower than the Worrisome Level of Soil Contamination (Area 1), which was designated by the Soil Environment Conservation Act of Korea.

Keywords low strength concrete, backfill, heavy metals, coal ashes, ponded ashed, cement

석탄재의 콘크리트 활용에 따른 중금속 함량변화 연구

이진원1 ·최승현1 ·김강주1* ·김석휘2 ·문보경3

1군산대학교 환경공학과, 2고등기술연구원, 3한국서부발전(주)

Received: August 14, 2018; Accepted: August 29, 2018

요 약

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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