Tic Evaluation of Environmental Impact Reduction by the Waste Asphalt Concrete Recycling

Nakano, Kazuko; Miura, Hiroyuki; Wada, Yasuhiko

doi:10.2208/jscej.1997.559_81

Cited by 5 publications

(1 citation statement)

References 2 publications

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“…where RGM C (kg-CO 2 eq) is the reduction of GHG elicited by replacing new aggregate with recycled aggregate from waste concrete and asphalt, GEM A (kg-CO 2 eq) is the GHG emissions from the production of new aggregate to be replaced, GEMc (kg-CO 2 eq) is the GHG emissions from the production of recycled aggregate, DC (kg) is the amount of waste concrete and asphalt generated, E ap (kg-CO 2 eq/kg) is the GHG emission intensity from aggregate production, and E rp (kg-CO 2 eq/kg) is the GHG emission intensity from the production of recycled aggregate. The yield when producing recycled aggregate from waste concrete and asphalt was assumed to be 1.0 [35], and it was assumed that the entire amount generated would be recycled. After disposal of the steel materials such as rebars, auxiliary horizontal structures, and metal fittings, new crude steel was replaced by producing recycled crude steel from the waste steel.…”

Section: Material/fuel Name Unit Ghg Emissionsmentioning

confidence: 99%

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

Iwase

Sasaki

Araki³

et al. 2020

Sustainability

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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.

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Section: Material/fuel Name Unit Ghg Emissionsmentioning

confidence: 99%

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

Iwase

Sasaki

Araki³

et al. 2020

Sustainability

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Life Cycle Evaluation of the Environmental Loading and Construction Cost in Paving Processes

Amano¹,

Makita²

2000

Doboku Gakkai Ronbunshu

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An optimal scheme of road paving maintenance was investigated by examining the environmental loading and cost considerations of pavement operations over a 30-year life cycle. Results indicated that the application of recycled materials in pavement construction and repair reduced the effects of environmental loading over the life cycle by approximately 40%. Furthermore, it was observed that environmental loading conditions associated with the maintenance repair stage of asphalt paving comprised 50% of the total environmental loading determined for the 30-year life cycle. Conversely, costs of the maintenance repair stage were 40% of the total life cycle costs. Finally, results suggest that environmental load and cost considerations will be improved and made more efficient over a life cycle period if a regular maintenance routine of simple asphalt repairs is established. INTRODUCTIONThe need to protect the environment is of paramount concern, particularly when a l a rge-scale project such as a road is being undertaken. It is necessary that all aspects of construction and maintenance be monitored in relation to the environment, especially hidden factors, including the production of input materials and assembling vehicles for operational purposes. Unfortunately, very few sources exist that examine the effects of both construction materials and vehicles on the environment. Those papers that investigate both components do not evaluate the environmental issues over the whole life cycle of the road. This study investigates the environmental loading and cost parameters associated with the construction and maintenance of a road over a 30-year life cycle. The cycle includes a number of repair works as well as the optimal maintenance schedule for the road. Furthermore, the evaluation considers the impact of using recycled material in road construction and maintenance work. The Life Cycle Inventory Method is used to determine the environmental loading conditions of a road, while construction and maintenance costs are estimated using statistical tables [1][2][3][4] published in 1995 by a variety of organizations.

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A Study on the Material Balance of Road Forcused on Construction Waste in Japan

Hara¹,

Yoshida²,

Matsuhashi³

2003

Doboku Gakkai Ronbunshu

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Tic Evaluation of Environmental Impact Reduction by the Waste Asphalt Concrete Recycling

Cited by 5 publications

References 2 publications

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

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

Life Cycle Evaluation of the Environmental Loading and Construction Cost in Paving Processes

A Study on the Material Balance of Road Forcused on Construction Waste in Japan

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