Optimal mixing proportion of bottom-ash-based controlled low strength material for high fillability

Youngsu Lee , Taeyeon Kim , Bongjik Lee , Seongwon Hong

Abstract

Bottom ash classifies as a hazardous industrial-waste material that adversely affects human health. This study proposes its mixing with controlled low strength materials (CLSM) as a probable recycling approach. To this end, experiments have been performed to investigate the applicability of bottom-ash-based CLSM that comprises eco-friendly soil binders, water, fly ash, and a combination of bottom ash and weathered granite soil. The physical and chemical properties of the weathered granite soil, bottom ash, fly ash, and soil binders are analyzed via laboratory tests, including X-ray diffraction and scanning electron microscopy. To determine an appropriate CLSM mixing proportion, the flowability test is first performed on three mixture types having three replacement ratios of fly ash each. Subsequently, compressive-strength tests are performed. Based on the results of these tests, four mixtures are selected for the freeze-and-thaw test to determine the appropriate mixing proportion. Finally, the ground model and soil-contamination tests are performed to examine the field applicability of the mixture. This study confirms that bottom-ash-based CLSM causes negligible soil contamination, and it satisfies the prescribed performance requirements and contamination standards in Korea.

Key Words

environmentally friendly soil binder; field applicability; freezing and thawing; ground model test

Address

Youngsu Lee — Taeyoung E&C, 111 Yeouigongwon-ro, Seoul 07241, Korea
Taeyeon Kim — Department of Civil and Environmental Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
Bongjik Lee — Department of Civil Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk 27469, Republic of Korea
Seongwon Hong — Department of Safety Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk 27469, Republic of Korea

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