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Sustainability 2017, 9(2), 318; doi:10.3390/su9020318

Carbon Dioxide Emission Evaluation of Porous Vegetation Concrete Blocks for Ecological Restoration Projects

1
Research Institute of Technology, Contech Engineering Co. Ltd., 69 Seongnam Road, Seongnam 13636, Korea
2
Department of Bio-Industry Mechanical Engineering, Koungju National University, 54 Daehak Street, Yesan 32439, Korea
3
Department of Rural Construction Engineering, Koungju National University, 54 Daehak Street, Yesan 32439, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Vincenzo Torretta
Received: 25 December 2016 / Revised: 2 February 2017 / Accepted: 16 February 2017 / Published: 22 February 2017
(This article belongs to the Section Sustainable Use of the Environment and Resources)
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Abstract

The purpose of this study is to determine the mix proportions that can minimize CO2 emissions while satisfying the target performance of porous vegetation concrete. The target performance of porous vegetation concrete was selected as compressive strength (>15 MPa) and void ratio (>25%). This study considered the use of reinforcing fiber and styrene butadiene (SB) latex to improve the strength of porous vegetation concrete, as well as the use of blast furnace slag aggregate to improve the CO2 emissions-reducing effect, and analyzed and evaluated the influence of fiber reinforcing, SB latex, and blast furnace slag aggregate on the compressive strength and CO2 emissions of porous vegetation concrete. The CO2 emissions of the raw materials were highest for cement, followed by aggregate, SB latex, and fiber. Blast furnace slag aggregate showed a 30% or more CO2 emissions-reducing effect versus crushed aggregate, and blast furnace slag cement showed a 78% CO2 emissions-reducing effect versus Portland cement. The CO2 emissions analyses for each raw material showed that the CO2 emissions during transportation were highest for the aggregate. Regarding CO2 emissions in each production stage, the materials stage produced the highest CO2 emissions, while the proportion of CO2 emissions in the transportation stage for each raw material, excluding fiber, were below 3% of total emissions. Use of blast furnace slag aggregate in porous vegetation concrete produced CO2 emissions-reducing effects, but decreased its compressive strength. Use of latex in porous vegetation concrete improved its compressive strength, but also increased CO2 emissions. Thus, it is appropriate to use latex in porous vegetation concrete to improve its strength and void ratio, and to use a blast furnace slag aggregate replacement ratio of 40% or less. View Full-Text
Keywords: blast furnace slag aggregate; CO2 emissions; fiber; latex polymer; void ratio; porous vegetation concrete blast furnace slag aggregate; CO2 emissions; fiber; latex polymer; void ratio; porous vegetation concrete
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Kim, H.-H.; Lee, S.-K.; Park, C.-G. Carbon Dioxide Emission Evaluation of Porous Vegetation Concrete Blocks for Ecological Restoration Projects. Sustainability 2017, 9, 318.

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