Official Journal of the Japan Wood Research Society
Table 3 Evaluation result for greenhouse gas (GHG) emissions over a 40-year evaluation period
From: Life cycle greenhouse gas emission of wooden guardrails: a study in Nagano Prefecture
Wooden type no. 1 | Wooden type no. 3 | Steel | ||||
|---|---|---|---|---|---|---|
Painting treatment | Pressure injection | Painting treatment | Pressure injection | Guardrail | Guard pipe | |
Service life (year) | 10 | 20 | 10 | 20 | 40 | 40 |
Raw material procurement and production process | ||||||
Resource extraction—support post production | 12.80 | 12.80 | 14.00 | 14.00 | 12.72 | 17.61 |
Resource extraction—steel beam production | 33.08 | 33.08 | – | – | 20.96 | 20.86 |
Resource extraction—connector production | 5.75 | 5.75 | 4.83 | 4.83 | 1.36 | 6.00 |
Silviculture—wooden beam production | 0.66 | 0.66 | 1.49 | 1.49 | – | – |
Preservative procurement—pressure injection | – | 4.35 | – | 4.07 | – | – |
Resource extraction—paint production | 0.37 | – | 0.47 | – | – | – |
Construction process | 0.59 | 0.59 | 2.82 | 2.82 | 0.59 | 0.80 |
Maintenance and management process | ||||||
Replacement of wooden beams (the 10th year) | 1.03 | – | 1.96 | – | – | – |
Replacement of wooden beams (the 20th year) | 1.03 | 5.01 | 1.96 | 5.56 | – | – |
Replacement of wooden beams (the 30th year) | 1.03 | – | 1.96 | – | – | – |
Disposal process | ||||||
Energy use of disposed wooden beams | −43.11 | −21.55 | −115.75 | −57.87 | – | – |
Material use of disposed steel and concrete | −21.29 | −21.29 | −13.27 | −13.27 | −21.18 | −27.10 |
Total | ||||||
Greenhouse gas (GHG) emissions (raw material procurement and production—maintenance and management process) | 56.36 | 62.24 | 29.50 | 32.77 | 35.64 | 45.26 |
Net GHG emissions (raw material procurement and production—disposal process) | −8.03 | 19.40 | −99.52 | −38.38 | 14.46 | 18.15 |