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Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs

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Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
2
Research Faculty of Agriculture, Hokkaido University, Kita 9, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan
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Hattori Engineer Co., Ltd., 2-2-12 Miroku, Aoi-ku, Shizuoka, Shizuoka 420-0053, Japan
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United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
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Institute of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(8), 3424; https://doi.org/10.3390/su12083424
Received: 26 March 2020 / Revised: 16 April 2020 / Accepted: 21 April 2020 / Published: 22 April 2020
(This article belongs to the Section Sustainable Engineering and Science)
Cross-laminated timber (CLT) has gained popularity worldwide in recent years, and its use in buildings and civil engineering structures has attracted attention in Japan. In this study, the life-cycle greenhouse gas (GHG) balance and costs associated with CLT floor slabs were evaluated with respect to small-scale bridge repair as the first instance of the use of CLT in civil engineering projects in Japan. Additionally, waterproofing treatment was applied to CLT slabs, and the potential GHG and cost reduction of CLT in comparison with reinforced concrete (RC) slabs were examined. GHG emissions were the smallest for non-waterproofed CLT slabs and the greatest for RC slabs. When replacing RC slabs with CLT slabs without waterproofing, fossil-derived GHG emissions can be reduced by 73 kg-CO2eq/m2 per slab, and fossil/wood-derived GHG emissions can be reduced by 67 kg-CO2eq/m2; however, the use of disposed CLT as fuel is essential. Moreover, a reduction in GHG emissions can be expected if RC slabs are replaced with CLT slabs that are waterproofed only once every 20 years. Further, the cost associated with RC slabs is 20% of that attributable to CLT slabs. Hence, measures need to be taken to reduce the cost of CLT and waterproofing materials. View Full-Text
Keywords: cross-laminated timber; floor slabs; life-cycle assessment; greenhouse gas emissions; waterproofing treatment; reinforced concrete cross-laminated timber; floor slabs; life-cycle assessment; greenhouse gas emissions; waterproofing treatment; reinforced concrete
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MDPI and ACS Style

Iwase, T.; Sasaki, T.; Araki, S.; Huzita, T.; Kayo, C. Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs. Sustainability 2020, 12, 3424. https://doi.org/10.3390/su12083424

AMA Style

Iwase T, Sasaki T, Araki S, Huzita T, Kayo C. Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs. Sustainability. 2020; 12(8):3424. https://doi.org/10.3390/su12083424

Chicago/Turabian Style

Iwase, Tetsuya, Takanobu Sasaki, Shogo Araki, Tomohumi Huzita, and Chihiro Kayo. 2020. "Environmental and Economic Evaluation of Small-Scale Bridge Repair Using Cross-Laminated Timber Floor Slabs" Sustainability 12, no. 8: 3424. https://doi.org/10.3390/su12083424

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