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http://dx.doi.org/10.12814/jkgss.2021.20.3.001

A Pilot Test for the Utilization of Road Subsoil of the Tertiary Mudstone in Pohang Basin  

Gong, Jeong-Sik (Dept. of Civil and Environ. Eng., Korea Maritime and Ocean Univ.)
Baek, In-Woo (Dept. of Civil and Environ. Eng., Korea Maritime and Ocean Univ.)
Kim, Jae-Gon (Korea Institute of Geoscience and Mineral Resources)
Song, Young-Suk (Korea Institute of Geoscience and Mineral Resources)
Kim, Tae-Hyung (Dept. of Civil Eng., Korea Maritime and Ocean Univ.)
Publication Information
Journal of the Korean Geosynthetics Society / v.20, no.3, 2021 , pp. 1-10 More about this Journal
Abstract
The purpose of this study is to present the possibility a utilization of the tertiary mudstone in Pohang as road subsoil material through pilot experiments on the road embankment structure. This mudstone is an unconsolidated rock that is distributed in the soft rock sedimentary layer, the tertiary layer of the Cenozoic, and causes physical problems such as slaking, swelling, and reduced shear strength and chemical problem like acid drainage. In order to solve various complex problems, an laboratory mixing test was conducted, and the optimal mixing conditions of the tertiary mudstone (90%), composite slag (steel making 70%, blast furnace 30%), and neutralization and coating agent treatment were derived. In order to prove its utilization, a real-scale road embankment structure was constructed and tests were conducted for each section. The pre-processing section is stable due to the design of optimal mixing conditions, while in post-processing section, natural weathering proceeded rapidly, and structural problems were concerned. Since the effect of neutralizing and coating agents was confirmed in temporary-staking section, the neutralizing and coating agents can be applied during the temporary storage period.
Keywords
Road subsoil; Tertiary mudstone; Composite slag; Slaking; Swelling; Acid drainage;
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