Capture: Regulating CaCO3 polymorphism to unlock the potential of carbonated steel slag as a cement replacement

捕获：调节 CaCO3 多态性以释放碳化钢渣作为水泥替代品的潜力

• 批准号: EP/Y001117/1
• 负责人: Fei Jin
• 金额: $ 20.27万
• 依托单位: CARDIFF UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2024
• 资助国家: 英国
• 起止时间: 2024 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FY001117%2F1
• 关键词: Capture; Regulating; CaCO3; polymorphism; unlock

The UK government pledges to achieve net zero emissions by 2050. Carbon capture and utilisation (CCU) in the cement and iron & steel sectors is considered a core measure toward this ambitious goal. An effective way of decarbonising the construction industry is to modify the Portland cement (PC) composition by reducing the clinker proportion. Replacing clinker with limestone (CaCO3, mainly calcite) proved to offset the CO2 emissions effectively while improving PC properties. Meanwhile, various alkaline solid wastes (ASW) have a significant potential of capturing CO2 whilst producing different CaCO3 polymorphs depending on the carbonation conditions. However, there is a lack of knowledge regarding the hydration characteristics of PC containing a range of CaCO3 polymorphs. In this proof-of-concept project, we will adopt steel slag (SS) as a representative ASW to validate the hypotheses that: (i) CaCO3 polymorphism can be regulated via controlling the carbonation conditions of SS and (ii) distinctively different CaCO3 polymorphs interact with PC differently. The main purpose of this project is to build a long-lasting partnership between researchers from the UK, China and Singapore, to collectively address the technical challenges of utilising ASW more efficiently and effectively as cement additives. The assembled project members from Cardiff University (UK), Nanjing Tech University (China) and Singapore Institute of Technology (Singapore) have complementary expertise in ASW characterisation and carbonation, cement science and structural engineering. The commonality of the team is our research interest in CCU in construction materials. Our intention is to share our knowledge and skills, advance the global understanding of ASW carbonation and utilisation in cement and concrete, and explore future research opportunities between academics from different countries.

英国政府承诺到2050年实现净零排放。水泥和钢铁行业的碳捕获和利用（CCU）被认为是实现这一宏伟目标的核心措施。建筑业脱碳的一个有效方法是通过减少熟料比例来改变波特兰水泥（PC）的成分。事实证明，用石灰石（CaCO3，主要是方解石）代替熟料可以有效抵消二氧化碳排放，同时改善 PC 性能。同时，各种碱性固体废物（ASW）具有捕获二氧化碳的巨大潜力，同时根据碳酸化条件产生不同的碳酸钙多晶型物。然而，人们对含有一系列 CaCO3 多晶型物的 PC 的水合特性缺乏了解。在这个概念验证项目中，我们将采用钢渣（SS）作为代表性ASW来验证以下假设：（i）CaCO3多晶型可以通过控制SS的碳化条件来调节；（ii）明显不同的CaCO3多晶型与 PC 的交互方式不同。该项目的主要目的是在英国、中国和新加坡的研究人员之间建立长期合作伙伴关系，共同解决更高效、更有效地利用 ASW 作为水泥添加剂的技术挑战。来自卡迪夫大学（英国）、南京工业大学（中国）和新加坡理工大学（新加坡）的项目成员在反潜水表征和碳化、水泥科学和结构工程方面拥有互补的专业知识。团队的共同点是我们对建筑材料CCU的研究兴趣。我们的目的是分享我们的知识和技能，促进全球对 ASW 碳化及其在水泥和混凝土中的利用的理解，并探索来自不同国家的学者之间的未来研究机会。