Abstract
The construction industry plays a significant role in environmental strain, attributed mainly to its substantial resource consumption, primarily driven by the surge in residential construction. Modern Methods of Construction (MMC) presents an innovative paradigm for designing and constructing infrastructure and buildings more efficiently, using conventional materials with unconventional techniques. The article aims to apply this approach to an MMC-based building structure, minimizing its life cycle impact by optimizing the consumption of building materials, with particular attention to the effects of the maintenance phase from a preventive point of view. This study focuses on assessing the sustainability of reinforced concrete flat slabs employing a hollow structural body system, explicitly emphasizing environmental aggressiveness factors contributing to corrosion, such as carbonation and chlorides. The research explores ten design options for a waterfront public residential building, examining their impact on the economy, the environment, and even society regarding the maintenance cycles required over the structure's lifetime, depending on the preventive strategy employed for each design. In assessing the sustainability of these options, researchers employed a combination of the best-worst method (BWM) and the VIKOR technique, considering nine criteria related to sustainability. The study found that 5 % silica fume concrete is the most cost-effective and environmentally friendly option, with hydrophobic impregnation reducing social impacts. However, compared to one- and two-dimensional evaluations, the study demonstrates the importance of simultaneously considering a design's life cycle's economic, environmental, and social impacts to achieve sustainability in maintenance with a holistic view. This approach led to an 86 % higher sustainability rating for a design using sulforesistant cement in the concrete mix than the baseline.
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