膨張性土壌の安定化における低炭素代替材としての高炉スラグ微粉末（GGBS）に関するレビュー
A review of ground granulated blast furnace slag (GGBS) as a low-carbon alternative for stabilisation of expansive soil (原題)
Oluwaseun Olatunji Otunola, A. M., Balogun Waheed Oyelola
🤖 gxceed AI 要約
日本語
本レビューは、膨張性粘土の安定化において、高炭素なポルトランドセメントに代わる低炭素バインダーとして高炉スラグ微粉末（GGBS）の有効性を評価する。GGBSは可塑性指数や自由膨張指数を最大19.23%低減し、10〜20%の最適添加量で一軸圧縮強度を向上させる。反応性マグネシア（MgO）などの新規活性化剤は硫酸・酸抵抗性に優れるが、極端な湿乾・凍結融解サイクル下での長期耐久性と微細構造安定性の検証が今後の課題である。
English
This review evaluates ground granulated blast furnace slag (GGBS) as a low-carbon binder for stabilising expansive soils, an alternative to high-carbon Portland cement. GGBS reduces plasticity and free swell indices by up to 19.23% and improves unconfined compressive strength at optimal dosages of 10–20%. Novel activators like reactive magnesia (MgO) show superior sulphate and acid resistance, but long-term durability under extreme field weathering remains a critical knowledge gap.
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
日本では建設分野の脱炭素化と産業副産物の有効活用がGX政策の重要課題であり、GGBSは鉄鋼スラグの再資源化として循環経済・Scope 3削減に寄与しうる。建設会社やインフラ発注者にとって、低炭素土壌改良材の選定はカーボンニュートラル調達の実務判断に直結する。
In the global GX context
Globally, this review supports the decarbonisation of construction materials, a hard-to-abate sector increasingly targeted by CSRD and green procurement rules. It provides empirical evidence on industrial by-product reuse, relevant to circular economy and embodied carbon accounting in infrastructure projects.
👥 読者別の含意
🔬研究者:GGBSおよびMgO活性化剤の長期耐久性・微細構造に関する研究ギャップを明確化し、今後の実験設計に資する。
🏢実務担当者:低炭素土壌安定化材の選定や配合設計において、GGBSの性能と限界を理解するための実務的知見を提供する。
🏛政策担当者:建設分野の脱炭素化と産業副産物活用を促す規制・調達基準の設計に、GGBSの有効性と残された課題を示す。
📄 Abstract（原文）
Expansive soils, characterised by significant volume instability due to seasonal moisture fluctuations, pose substantial risks to civil engineering infrastructure. While Ordinary Portland Cement (PC) is a traditional stabiliser, its high carbon footprint and energy consumption necessitate the adoption of sustainable alternatives. This study reviews the efficacy of Ground Granulated Blast Furnace Slag (GGBS), an industrial by-product, as a low-carbon binder for soil stabilisation. GGBS, a latent hydraulic material, requires activation to form cementitious compounds such as calcium silicate hydrate (C-S-H). Research indicates that incorporating GGBS significantly enhances the geotechnical properties of expansive clays, including reductions in the Plasticity Index and the Free Swell Index (FSI) by up to 19.23% relative to untreated clay at a 9% dosage. Mechanical performance is notably improved, with Unconfined Compressive Strength (UCS) gains observed at optimal dosages typically between 10% and 20% and further amplified by extended curing durations. Novel activators such as reactive magnesia (MgO) demonstrate superior efficacy compared to traditional lime or PC, offering enhanced resistance to sulphate and acid attacks. However, a critical knowledge gap remains regarding the long-term durability and microstructural stability of MgO-GGBS-stabilised soils under extreme field weathering conditions, such as repetitive wet-dry and freeze-thaw cycles. This review underscores the potential of GGBS-based binders to promote sustainable ground improvement while highlighting the need for further studies on their environmental longevity.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1007/s44290-026-00619-3first seen 2026-10-09 04:47:16
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