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ENVIRONMENTAL IMPACT SHARES OF A REINFORCED CONCRETE EARTH-RETAINING WALL WITH BUTTRESSES |
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| รหัสดีโอไอ | |
| Title | ENVIRONMENTAL IMPACT SHARES OF A REINFORCED CONCRETE EARTH-RETAINING WALL WITH BUTTRESSES |
| Creator | FRANCISCA MOLINA-MORENO, JOS |
| Contributor | - |
| Publisher | ISEC PRESS |
| Publication Year | 2560 |
| Keyword | Life cycle assessment, Functional unit, Steel recycling rate, Concrete ratio, Photochemical oxidation, Ozone depletion, Global warming |
| Abstract | Structural engineers focus on the reduction and partial substitution of the cement in reinforced concrete structures, while other impacts such as the ozone depletion and the air acidification become secondary or are left behind. The featured life cycle assessment shows the impacts corresponding to each construction stage of an earth-retaining wall with buttresses. The contribution ratio of each input flow is analyzed. The flows are modeled as individual subsystems of the earth-retaining wall. Accordingly, concrete, landfill, machinery, formwork, steel, and transport are defined as subsystems of the construction of the infrastructure. A previous study showed that the contribution shares of impacts do not linearly vary with the height. Therefore, a functional unit is defined per wall height. Results show that the concrete almost always accounts for the largest contribution to each impact, except for the ozone depletion potential (ODP) and the photochemical oxidation of air (POCP). The use of machinery holds the biggest ODP share (30%) while the steel is the largest contributor to POCP. Once the wall height is fixed, a parameter of study was the recycling rate. A recycling rate of 70% is usually reached. The study shows a noticeable reduction of several impacts when the recycling content increases. The relationship of the impacts of each material with the amount of material used discloses research interest. However, this relationship is greatly influenced by the cement manufacturing technology and the steel recycling potential in the area. |
| ISBN | 978-0-9960437-4-8 |
