Low-carbon materials and green construction最新文献

{"title":"Low-carbon ultra-high-performance concrete: raw materials, particle packing optimization, and data-driven performance assessment-a review.","authors":"Ahmed Fageeri, Ousmane Hisseine","doi":"10.1007/s44242-026-00116-x","DOIUrl":"10.1007/s44242-026-00116-x","url":null,"abstract":"<p><p>Ultra-high-performance concrete (UHPC) offers exceptional mechanical properties and durability; however, its cement-intensive formulations raise concerns regarding environmental sustainability. This study addresses this challenge by establishing quantitative relationships between UHPC mixture design, performance indicators, and embodied CO₂ emissions by coupling a literature survey with data-driven analysis of over 200 mixtures. Unlike previous studies that examine the behavior of raw materials and the resulting performance in isolation, this study leverages data-driven approaches to link mixture design parameters to mechanical performance, durability indicators, and embodied CO₂ emissions, thereby providing useful insights into low-carbon UHPC formulations. The influence of supplementary cementitious materials and mineral fillers is evaluated across rheological, mechanical, durability, and carbon footprint aspects. Machine learning (i.e., Random Forest) analysis demonstrates high accuracy in predicting compressive strength from mixture design parameters, while tensile properties and permeability remain influenced by microstructural factors not captured by mixture design parameters. Heat map correlation reveals strong interdependencies among mechanical and durability performance indicators, with compressive strength highly correlated (95%-98%) across curing ages and inversely related to permeability-related durability metrics. An exponential relationship between cement-to-binder and water-to-cement ratios is established (<i>R</i> ² of 95%), providing a strong predictive tool for mixture design. From a carbon footprint perspective, cement is the dominant contributor to CO₂ emissions, as expected. Interestingly, cement content above 800 kg/m³ has negligible contributions to mechanical properties while significantly increasing the embodied CO₂ emissions. By adopting a data-driven approach, this study provides novel insights into designing UHPC mixtures that foster higher mechanical and durability performance while reducing embodied carbon.</p><p><strong>Graphical abstract: </strong></p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at https://doi.org/10.1007/s44242-026-00116-x.</p>","PeriodicalId":520366,"journal":{"name":"Low-carbon materials and green construction","volume":"4 1","pages":"20"},"PeriodicalIF":0.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13593704/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149027487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydration and carbonation curing of high ferrite clinker (FePC) synthesized using EAF slag.","authors":"Elijah Adesanya, Visa Isteri, Aniruddha Baral, Christiane Rößler, Theodore Hanein, Juho Yliniemi","doi":"10.1007/s44242-024-00051-9","DOIUrl":"https://doi.org/10.1007/s44242-024-00051-9","url":null,"abstract":"<p><p>This study explores the use of Electric Arc Furnace (EAF) slag as a sustainable alternative raw material in cement clinker production. The research demonstrates the synthesis of ferrite-rich clinker using EAF slag, achieving a clinker composition of 47% alite, 32% ferrite, and 20% belite while replacing 20% of clinker raw materials i.e. limestone, iron and silica source. The hydration behavior and influence of carbonation curing on the reactivity of the ferrite phase were assessed. Results show that the addition of 5% gypsum to the clinker enhanced the hydration rate of alite and ferrite phases, promoting the formation of portlandite, C-S-H and ettringite as the major hydration phases. Typical of ferrite-rich cement, Fe/Al-rich siliceous hydrogarnet was also identified as secondary hydration products of the ferrite phase, formed as a result of the reaction of katoite (formed from ferrite dissolution) with dissolved silica. However, prolonged carbonation exposure led to a decrease in the formation of the hydrogarnet and the decomposition of ettringite, but the mortar's strength increased with increasing calcium carbonate formation.</p><p><strong>Supplementary information: </strong>The online version contains supplementary material available at 10.1007/s44242-024-00051-9.</p>","PeriodicalId":520366,"journal":{"name":"Low-carbon materials and green construction","volume":"2 1","pages":"21"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11698376/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142934417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}