ABSTRACT
The construction industry has a significant impact on the environment, particularly in the residential building sector, due to high resource consumption. To reduce environmental impact in the construction, service, and end-of-life phases of buildings, scholars prioritize adopting Modern Methods of Construction (MMC) to optimize material consumption and minimize the life cycle impact of buildings. This study assesses the sustainability of reinforced concrete flat slabs using a hollow structural body system, especially in environments that trigger concrete corrosion. The analysis focuses on seven design alternatives for a beachfront hotel structure, using the VIKOR technique to aggregate five sustainability criteria. The most cost-effective and environmentally beneficial option is using 10% silica fume concrete, which reduces life-cycle costs by 87% and impacts the base design by 67%. However, considering economic and environmental sustainability criteria led to better sustainable designs, such as a more extensive concrete cover for bottom reinforcing bars resulting in a 46% better sustainability index.
