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<p>This study investigates the effectiveness of Autoclaved Aerated Concrete (AAC) blocks in mitigating the Urban Heat Island (UHI) effect within the context of residential construction in Bangladesh. A comprehensive comparison was conducted among AAC, hollow cement blocks, and conventional bricks through laboratory testing, real-time thermal performance evaluation, structural analysis using ETABS software, and a Life Cycle Assessment (LCA) using OpenLCA. Experimental results reveal that AAC blocks possess the lowest unit weight (657.34&#xa0;kg/m<sup>3</sup>) and compressive strength (2.20&#xa0;MPa), but offer superior thermal insulation, with internal peak temperatures nearly 3&#xa0;°C lower than traditional bricks. Despite high water absorption, AAC's lightweight and porous structure significantly enhances indoor thermal comfort and reduces cooling load. When combined with hollow cement blocks, offering higher structural strength and moisture resistance, the hybrid wall system demonstrated a balanced performance. Structural analysis showed a 1509.47-kip reduction in base reaction compared to traditional brick walls, without compromising stability. Additionally, the LCA confirmed AAC’s environmental advantage, with the lowest carbon footprint (1050&#xa0;kg CO₂eq per m<sup>3</sup>) among all materials studied. Overall, the study supports the combined use of AAC blocks for internal partitions and hollow cement blocks for external walls as a practical and sustainable construction strategy to improve energy efficiency, structural economy, and environmental performance in rapidly urbanizing regions like Bangladesh.</p>

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Mitigating urban heat in Bangladesh: a hybrid wall approach using AAC and hollow cement blocks

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Abid Hussain,
  • Taifur Hossain Dhrubo,
  • Zarin Anan Adeeba,
  • Shariful Hoque Akash

摘要

This study investigates the effectiveness of Autoclaved Aerated Concrete (AAC) blocks in mitigating the Urban Heat Island (UHI) effect within the context of residential construction in Bangladesh. A comprehensive comparison was conducted among AAC, hollow cement blocks, and conventional bricks through laboratory testing, real-time thermal performance evaluation, structural analysis using ETABS software, and a Life Cycle Assessment (LCA) using OpenLCA. Experimental results reveal that AAC blocks possess the lowest unit weight (657.34 kg/m3) and compressive strength (2.20 MPa), but offer superior thermal insulation, with internal peak temperatures nearly 3 °C lower than traditional bricks. Despite high water absorption, AAC's lightweight and porous structure significantly enhances indoor thermal comfort and reduces cooling load. When combined with hollow cement blocks, offering higher structural strength and moisture resistance, the hybrid wall system demonstrated a balanced performance. Structural analysis showed a 1509.47-kip reduction in base reaction compared to traditional brick walls, without compromising stability. Additionally, the LCA confirmed AAC’s environmental advantage, with the lowest carbon footprint (1050 kg CO₂eq per m3) among all materials studied. Overall, the study supports the combined use of AAC blocks for internal partitions and hollow cement blocks for external walls as a practical and sustainable construction strategy to improve energy efficiency, structural economy, and environmental performance in rapidly urbanizing regions like Bangladesh.