Evaluation of the Impact of Autoclaved Aerated Concrete (AAC) Lightweight Bricks on Energy Efficiency and Construction Sustainability: A Multi-Site Qualitative Case Study in Batam City
DOI:
https://doi.org/10.52722/v51y0z24Keywords:
AAC lighweight brick, energy efficiency, sustainable construction, thermal isolation, carbon emissionAbstract
The construction sector accounts for nearly 40% of global greenhouse gas emissions, making material selection critical to the sustainability agenda. This study analyzes the impact of Autoclaved Aerated Concrete (AAC) lightweight brick on energy efficiency and construction sustainability using a descriptive qualitative, multi-site case study approach, through semi-structured interviews, field observation in Batam City, and document studies of Bill of Quantity, energy simulations, and laboratory certificates. Data validity was ensured through source triangulation, member checking, and audit trail. Laboratory certificates record an AAC thermal conductivity of 0.16-0.20 W/mK. Energy simulation reports show HVAC energy consumption of 118,400 kWh/year for AAC walls versus 146.700 kWh/year for red brick walls, a reduction of about 15-25% in line with Minister of Public Works Regulation No. 21 of 2021. Bill of Quantity data record a wall weight of 120 kg/m² for AAC versus 250 kg/m² for red brick, lowering the structural dead load by about 60%, while field observation records material waste of 4,8 % of wall volume. For comparison, the literature reports energy savings of up to 35% and AAC waste below 5%. The study concludes AAC is a strategic material for low-carbon construction in Indonesia as mandated by Regulation No. 9 of 2021.
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References
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