Adjustment and application of CO2-efficient composite admixtures (calcined clay - sulfate carrier - limestone powder) for control of concrete properties

控制混凝土性能的CO2高效复合外加剂（煅烧粘土-硫酸盐载体-石灰石粉）的调整和应用

• 批准号: 519196620
• 负责人: Dr.-Ing. Nancy Beuntner
• 金额: --
• 依托单位: Institut für Werkstoffe des Bauwesens
• 依托单位国家: 德国
• 项目类别: Research Grants (Transfer Project)
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/519196620?language=en
• 关键词: Adjustment; application; CO2; efficient; composite

The concrete industry uses supplementary cementitious materials to reduce cement consumption and the associated CO2 emissions. The use of these replacement materials can influence various properties (e.g. heat development) that are relevant concerning specific applications. Since a large proportion of supplementary cementitious materials used today, e.g. fly ash, originate from CO2-intensive processes, their availability is not given in the long term. The concrete industry is therefore urgently dependent on the development of new replacement materials. In this context, materials based on calcined clays provide the greatest potential. In the underlying DFG project, fundamental mechanisms regarding the influence of the most important phyllosilicates occurring in clays on cement hydration were explored using model systems. A clear dependence on the composition of the three-component mixture consisting of calcined clay, sulfate carrier and limestone powder was found. In the planned project, therefore, optimally adjusted composite materials shall be developed and adapted with regard to the application-related target parameters. To this end, various raw materials will first be selected and analyzed. The findings from the preceding DFG-funded project will then first be transferred to real cementitious systems and concretes on a laboratory scale. Afterwards, these results are to be scaled up to the pilot plant scale in order to provide appropriate quantities for the development of demonstrators. Large-scale trials at the application partner will then show whether existing products can be produced with at least equivalent quality using the newly developed composite materials. This is to show if supplementary cementitious materials from CO2-intensive processes can substituted adequately. In addition, tools for rapid formulation adaptation, in the event of changes in raw material compositions or concrete property requirements, are to be developed. This shall be complemented by the preparation of recommendations and a practical guide for the concrete industry. Finally, the demonstrators produced will be compared with reference products in the course of a life cycle assessment.

混凝土行业使用辅助胶凝材料来减少水泥消耗和相关的二氧化碳排放。这些替代材料的使用可能会影响与特定应用相关的各种性能(例如，热发展)。由于目前使用的大量辅助性胶凝材料，如飞灰，来自二氧化碳密集型工艺，因此其可获得性不是长期的。因此，混凝土工业迫切依赖于开发新的替代材料。在这种背景下，以煅烧粘土为基础的材料提供了最大的潜力。在基础的DFG项目中，利用模型系统探索了粘土中最重要的层状硅酸盐对水泥水化的影响的基本机制。发现由煅烧粘土、硫酸盐载体和石灰石粉组成的三组分混合物的组成有明显的相关性。因此，在规划的项目中，应根据与应用相关的目标参数开发和调整最佳调整的复合材料。为此，首先将对各种原材料进行挑选和分析。之前DFG资助的项目的结果将首先转移到实验室规模的真实水泥系统和混凝土中。之后，这些结果将扩大到中试工厂规模，以便为示范器的开发提供适当的数量。然后，在应用伙伴进行的大规模试验将表明，使用新开发的复合材料是否可以生产出至少具有同等质量的现有产品。这是为了表明来自二氧化碳密集型工艺的辅助胶凝材料是否可以充分替代。此外，还将开发在原材料成分或混凝土性能要求发生变化时进行快速配方调整的工具。此外，还应编写混凝土行业的建议和实用指南。最后，将在生命周期评估过程中将所生产的示范产品与参考产品进行比较。