Soft grounds such as reclaimed land have been actively developed for maximizing utilization of narrow land area in South Korea. Generally, these grounds are characterized by poor drainage due to high content of fine-graded particles in the soil. These characteristics make it difficult to use for high-value-added purposes such as growing crops and constructing structures. Therefore, measures to improve poor drainage are required for the multifaceted use of these lands. On the other hand, in Korea, about 200,000 tons of oyster shells are generated, spoiling landscapes, generating odors, and destroying marine ecosystems. Bottom ash is also exported to 110-180 million tons per year in Korea alone, and many of them are buried and landed causing various environmental problems. Therefore, interest in recycling of oyster shells and bottom ash is increasing. However, in the case of recycling such industrial wastes, there are environmental risks caused by pollution, processing, transportation, and construction due to the recycled material itself. Therefore, the suitability for recycling and environmental evaluation of the material should be preceded.In this study, the evaluation of material compatibility of oyster shell and bottom ash waste as a drainage material for improvement of drainage performance of ground was performed. The quantitative environmental evaluation was carried out by estimating the life cycle CO2 emissions, and the recyclability of materials was evaluated based on the results.As a result of suitability evaluation of the materials for recycling, oyster shell and bottom ash were found to be able to replace sand as mixing and drainage material through horizontal drainage layer. However, the Cu content of the oyster shell and the low CEC of the bottom ash should be taken into consideration during construction. Life cycle CO2 emissions were estimated and the reduction effects of oyster shell and bottom ash recycling were confirmed and quantitative analysis was conducted. As a result of evaluating the recyclability of the materials, life cycle CO2 emissions reduction effect was obtained when the target material was used as a substitute for sand in a large area.The results of this study could contribute to the practical use of oyster shell and bottom ash as eco - friendly drainage material in poor drainage ground. In the future, various additional effects are expected, such as increased throughput of waste, elimination of natural aggregate supply shortage, expansion of usability of poor drainage grounds.
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