Utilization of Microalgae as Carbon Absorbent Material for Environmentally Friendly Concrete in Tropical Coastal Areas
熱帯沿岸地域における環境配慮型コンクリート用炭素吸収材としての微細藻類の利用 (AI 翻訳)
Risjunardi Damanik, Khadijah, Hanifah Sriamelia
🤖 gxceed AI 要約
日本語
本研究は、微細藻類（クロレラとスピルリナの1:1混合）をセメント代替材として用いたコンクリートの性能を評価。5%置換で圧縮強度は対照比6.4%低下するものの、塩化物イオン浸透抵抗が12.3%向上し、CO2固定量は38.7 kg/m3を達成。微細藻類が空隙を充填し、耐久性と炭素固定の両立が可能であることを示した。
English
This study evaluates concrete with a 1:1 blend of Chlorella and Spirulina as supplementary cementitious material. At 5% replacement, compressive strength drops only 6.4% while chloride resistance improves 12.3% and CO2 sequestration reaches 38.7 kg/m3. Microalgae fill pores, enhancing durability and carbon capture, offering a low-carbon option for tropical coastal construction.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本ではカーボンニュートラル社会実現に向け、建設分野でのCO2削減が急務。本研究成果は、セメント代替による排出削減とCO2固定を同時に実現する技術として、日本のコンクリート産業やゼロカーボン建材の開発に示唆を与える。特に、港湾・沿岸インフラでの適用が期待される。
In the global GX context
Globally, the cement industry accounts for ~8% of CO2 emissions. This study offers a novel approach using microalgae as SCM, contributing to low-carbon construction. The findings align with global efforts to decarbonize building materials and could inform ISSB-aligned disclosure of embodied carbon reductions.
👥 読者別の含意
🔬研究者:Provides experimental data on microalgae-based SCM, including mechanical and durability performance and CO2 sequestration rates.
🏢実務担当者:Offers a viable low-carbon concrete mix design (5% microalgae replacement) that maintains structural integrity and improves durability.
🏛政策担当者:Supports the inclusion of microalgae-based concrete in green building standards and carbon credit mechanisms.
📄 Abstract（原文）
This study evaluates the mechanical, durability, and carbon sequestration performance of a 1:1 blend of Chlorella vulgaris and Spirulina platensis biomass as a supplementary cementitious material (SCM) in concrete for tropical coastal infrastructure. Five replacement levels (0%, 3%, 5%, 7%, and 10% by weight of cement) were tested under ambient tropical conditions (28–32°C, 75–85% RH) reflecting West Sumatra's coastal environment. Compressive and flexural strength, water absorption, chloride penetration resistance, and CO₂ sequestration via thermogravimetric analysis were comprehensively assessed. Results indicate that 5% replacement (MA-5) achieved the optimal balance: 28-day compressive strength of 31.4 MPa (6.4% below control), while demonstrating 12.3% improved chloride resistance and a net carbon sequestration rate of 38.7 kg CO₂/m³ of concrete. Scanning electron microscopy confirmed microalgae cell-wall fragments filling interfacial transition zones, reducing porosity by 11.2% and enhancing matrix densification. The findings demonstrate that microalgae-incorporated concrete at 5% OPC replacement is a technically viable, low-carbon alternative for coastal tropical construction, offering both structural adequacy and environmental benefits. Adoption in Indonesia's green building programs is recommended, with future research needed to validate performance at industrial scale and assess long-term durability under field marine exposure.
🔗 Provenance — このレコードを発見したソース
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