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http://dx.doi.org/10.9720/kseg.2018.3.501

Occurrence and Influence of acid Leachate by Pyrite in Underground Rocks of Road Construction Field in the Miryang Area  

Chae, Sun Hee (Department of Construction Safety and Disaster Preventing Engineering)
Jeong, Chan Ho (Department of Construction Safety and Disaster Preventing Engineering)
Lee, Yu Jin (Department of Construction Safety and Disaster Preventing Engineering)
Lee, Yong Cheon (Department of Construction Safety and Disaster Preventing Engineering)
Shin, Sang Sik (Jisan Engineering)
Park, Jun Sik (Department of Construction Safety and Disaster Preventing Engineering)
Ou, Song Min (Department of Construction Safety and Disaster Preventing Engineering)
Publication Information
The Journal of Engineering Geology / v.28, no.3, 2018 , pp. 501-512 More about this Journal
Abstract
The acid leachate derived from the sulfide mineral such as pyrite can cause problems such as aging of infrastructure and environment contamination around the civil construction site. The purpose of this study is to assess the environmental effect of an acid leachate derived from pyrite in the Miryang area under road construction. In this study, 13 samples of situ core were used for the net acid generation (NAG) experiment. The chemical composition including pH, oxidation and reduction potential (ORP) and electrical conductance of water samples produced from the NAG test was analyzed. In additional, five polished thin sections of rock cores were made for electro microprobe analyses. In the results of the NAG tests, 7 samples showed lower values than pH 3.5. It strongly indicated that these areas are under the environmental and infrastructure damage by the acid leachate. The chemical type of the 7 samples was classified as the $Fe(Ca)-SO_4$ type, which is totally a different type compared to general groundwater. The concentration of total sulfur ranges from 0.004% to 12.5%. 6 rock samples are plotted on a potentially acid forming zone in the relation diagram between the total sulfide and NAG-pH. In conclusion, it is suggested that a protection method against an environmental demage and an infrastructure corrosions by the acid leachate should be prepared in all of areas under a road construction.
Keywords
acid leachate; pyrite; net acid generation; chemical composition;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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