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http://dx.doi.org/10.14190/JRCR.2018.6.4.267

Fundamental Properties of Lightweight Concrete with Dry Bottom Ash as Fine Aggregate and Burned Artificial Lightweight Aggregate as Coarse Aggregate  

Choi, Hong-Beom (Department of Architectural Engineering, Kongju National University)
Kim, Jin-Man (Department of Architectural Engineering, Kongju National University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.6, no.4, 2018 , pp. 267-274 More about this Journal
Abstract
Though the wet bottom ash has been used as a type of lightweight aggregate, dry bottom ash, new type bottom ash from coal combustion power plant, has scarcely researched. It is excellent lightweight aggregate in the view point of construction material. This study is performed to check the applicability of dry bottom ash as a fine aggregate in lightweight aggregate concrete, by analyzing various properties of fresh and hardened concrete. We get results that the slump of concrete is within the target range at less than 75% replacement rate of dry bottom ash, the air content is not affected by the replacement rate of dry bottom ash, the bleeding capacity is less than $0.025cm^3/cm^2$ at 75% under of the replacement rate of dry bottom ash, and the compressive strength of concrete show 90% or more comparing the base mix while initial strength development is a little low. Oven dry unit weight of concrete is reduced by 8.9% when replaced 100% dry bottom ash, and dry shrinkage tends to decrease depending on increase of replacement rate of dry bottom ash. Modulus of elasticity of concrete shows no decease at 50% over of the replacement rate of dry bottom ash, while modulus of elasticity of concrete decreases when the replacement rate increases further. The dry bottom ash, when used as a fine aggregate in lightweight concrete, can be used effectively without any deterioration in quality.
Keywords
Lightweight concrete; Bottom ash; Recycling; Aggregate; By-product;
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Times Cited By KSCI : 1  (Citation Analysis)
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