Abstract
The purpose of this study is to verify the environmental performance of the novel Void Deck Slab (VDS) system developed by the authors. The proposed VDS is a void slab system with enhanced design features that improve the constructability of the system through the elimination of additional works required to connect the void formers with the anchoring devices. The Life Cycle Assessment (LCA) technique was adopted to assess the carbon dioxide emissions of the void slab system with reference to the ordinary reinforced concrete slab. The system boundary of this study ranged from raw materials to pre-operation phase, in accordance with ISO 14044. The total CO2 emissions of the ordinary reinforced concrete slab and the void slab system were 204,433.06 and 151,754.75 kg CO2-eq, respectively, which equated to about 34% less emissions for the void slab system. In the case of the ordinary reinforced concrete slab, moulds accounted for approximately 62% of CO2 emission, followed by concrete (~34%). The main source of CO2 emissions for the void slab system was concrete that accounted for ~50%, followed by moulds and deck plates that accounted for roughly 27% and 19%, respectively. In the case of the void slab system, void formers would enable a lower amount of concrete, as well as the self-weight of the slab. Besides, although the void formers filled a significant volume of the slab, the contribution to CO2 emissions was less than 1%.
Highlights
Multi-storeyed buildings are increasingly preferred in both residential and commercial cases for the purpose of the effective utilisation of land, considering that cities have become more urbanised in recent years
The main source of CO2 emissions for the void slab system was concrete that accounted for ~50%, followed by moulds and deck plates that accounted for roughly 27% and 19%, respectively
Despite the fact that the void formers played a crucial role in the void slab system, the occurrence of CO2 was less than 1%, the impacts of whSicushtawinaobiulitlyd20b1e9, n11e, gx lFiOgRibPlEeER(sReEeVFIEiWgure 8)
Summary
Multi-storeyed buildings are increasingly preferred in both residential and commercial cases for the purpose of the effective utilisation of land, considering that cities have become more urbanised in recent years. High-rise buildings help to resolve a number of issues related to urbanisation, apart from maximising the economic efficiency of housing development projects; there are a few disadvantages with respect to evacuation in the event of an emergency, and accessibility to the upper floors in general. As global warming is a worldwide topic [1,2,5,6,7,8], there are a number of concerns applicable to high-rise buildings. The architecture, engineering, and construction (AEC) industry has been the main contributor to global warming and mass energy consumption, considering that it accounts for up to 38% of annual CO2 equivalent emissions, ~40% of the annual consumption of natural resources, and ~39% of the annual energy consumption [3,9,10,11]. The environmental impacts of the AEC industry in South Korea, being similar to those in other countries [4,12,13], have prompted the industry to devise strategies for eco-friendly and sustainable design and construction methods
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