報告主題：Reclaimed Calcined Clay Cements (Re-C3) Behaviour of Concrete to BS8500
報告專家🀄️：Li Zheng🤹🏽♂️，研究員，博士生導師🛍，University of Dundee
報告時間🤴🏽：2024年5月20日（周一）13：30—15：00
報告地點⚄：海洋樓410
報告內容👳：Cement is the most widely used material globally due to its abundant supply and affordability. However, the massive scale of cement and concrete production contributes significantly to CO2 emissions, estimated at 5-8%. As a result, the pursuit of low-carbon cementitious materials has gained substantial attention in recent decades. Among these, Limestone Calcined Clay Cements (LC3) have gained considerable interest, which substitutes approximately half of the traditional cement clinker with calcined clay and limestone. This study investigated using Reclaimed Calcined Clay to produce LC3. The clays used were reclaimed from various China clay quarries stockpiled not suitable for producing ceramics and collected dust from brick manufacture. The behavior of Re-C3 concrete was examined in terms of its fresh and hardened properties to BS8500. The results showed that recovered UK clays can produce highly reactive calcined clay cements. In general, Re-C3s have a higher water demand and require a plasticizing admixture. The strength development rates suggest that calcined clay reactions contribute significantly to compressive strength from around 3 days and ‘largely’ complete by 14 days. Highly reactive pozzolans of calcined clays result in higher rates of carbonation, however, chloride resistance is exceptional, which means Re-C3s can be well applied for marine infrastructure construction.
專家簡介：Li Zheng🍡，男，英國Dundee大學研究員，博士生導師，1982年獲東南大學學士學位，1984年獲東南大學碩士學位，1984-1996年工作於浙江大學土木工程意昂3材料工程研究室，任副教授及研究室主任🦻🏻。2001年獲鄧迪大學博士學位👆🏽。在混凝土技術領域擁有近四十年的研究工作經驗，主持/參與EPSRC🧖🏿♀️，KQAA，BCA🚵🏽♂️，WRAP，DEFRA和DTI等科研項目40余項🤦🏽♂️，發表Cement and Concrete Research🫰💇🏼，Cement and Concrete Composites等頂刊論文40余篇💖，主編/參編學術專著8部🦯。研究領域主要包括混凝土結構耐久性🥷🏽、泡沫混凝土、混凝土性能優化💡，材料性能數值模擬👱🏻♀️、低碳混凝土等。