With the deepening of the "double carbon" goal, the pressure of carbon emissions in the cement industry continues to rise. Traditional Portland cement relies on high energy consumption Recently, China Cement Network interviewed Ye Jiayuan, president and senior engineer of Cement Science and New Building Materials Research Institute of China Building Materials Research Institute Limited, focusing on the innovation, promotion and practice of low-carbon cementitious materials. Share the path of cement industry to promote green transformation through product system construction, standard case improvement and full chain service. 1. What are the products of low-carbon cementitious materials? In the public perception, the mainstream products of low-carbon cementitious materials are still mineral powder, ultra-fine powder and other types. But in fact, in addition to the large amount of auxiliary admixtures that have been widely used, there are also some products that are in the research and development stage or in the local trial, including: (1) Cement prepared by new low-carbon clinker: low-carbon cement prepared with new low-calcium low-carbon clinker as the base material, such as the sulfur Portland cement currently being developed and pilot-tested. The important features of this type of cement are the lower limestone content and the lower firing temperature. (2) Low Clinker/No Clinker Cement: Cement prepared by incorporating a large amount of mixed materials such as fly ash, slag, steel slag, etc., with significantly reduced or even no use of cement clinker, such as geopolymer cement, etc. The above products belong to the category of low-carbon cement, but the progress of popularization and application has not yet reached expectations, and the large-scale substitution of traditional Portland cement has not yet been realized. 2. Three elements of popularization and promotion of low-carbon cementitious materials 1. Although comprehensive substitution still needs time, the cement industry is making continuous efforts to promote its application in a wider range of engineering scenarios. Perhaps after a century of development, low-carbon cement will reshape the application pattern in the field of building materials. 2. The technical ideas, objectives and routes of geopolymer cement are feasible, but its promotion is still limited. The core factors refer to the above perspective, specifically: First, the standard system needs to be improved. At present, geopolymer cement lacks complete standard support, and industry experts and scholars are promoting the formulation of standards, covering product quality evaluation, performance testing methods and carbon footprint accounting and verification. It is expected that in 3-5 years, the standard system will be gradually improved, and the role of supporting and leading the promotion will be fully demonstrated. Second, the accumulation of basic data is insufficient. Promotion needs to be supported by reliable performance and cost data. Although relevant research has been carried out for decades, compared with Portland cement with a history of more than 200 years, the basic data precipitation of geopolymer cement is still weak. Third, the lack of typical cases. It is necessary to form benchmarking projects (such as bridges and buildings with stable performance after decades of service) that have been verified by long-term service, so as to enhance technical persuasion with practical results. To sum up, standards, data and case guidance need to be improved synchronously, and the shortcomings of any link will restrict the popularization and application of geopolymer cement. 3. Typical practice of low-carbon cementitious materials 1. At present, this kind of cement is classified as special cement, not included in the six series of GB-175 general Portland cement. As a special cement, its "characteristics" are reflected in the uniqueness of its performance, which determines its exclusive application field. For example, in mass concrete engineering, hydraulic dam construction is the most typical and successful application scenario. Therefore, it is not fair to compare it directly with Portland cement in all dimensions, and there are essential differences between their performance characteristics and application scenarios. 2. Taking LC3 as an example, this kind of new product faces more prominent resource constraints in China: its core raw material is calcined clay, while domestic clay resources are scarce and strictly protected by the red line of 1.8 billion cultivated land, so it can not be developed at will. If we directly copy the foreign LC3 technology route, the domestic implementation effect will be difficult to meet expectations. It should be clear that LC3 is not a product with a fixed formula, and its technical ideas can be flexibly used for reference-for example, alternative materials such as calcined coal gangue and calcined engineering dregs can be used as raw materials to promote the popularization and application of low carbon cement with no clinker and less clinker in China through localized innovation. 4. Grinding stations should provide complete low-carbon cement solutions . At present, some grinding stations are facing survival pressure, and some enterprises choose to switch to the production of ultra-fine powder and ultra-fine admixtures. This transformation can be maintained when the industry is booming, but in the current downturn period of the industry, not only the ultra-fine technology route is facing economic difficulties, but also other low-carbon technologies are facing similar difficulties. For the grinding station, the transformation should not be limited to the production of ultra-fine products, but should be integrated into a low-carbon overall solution-ultra-fine processing is only a specific technology in the scheme. If we can not provide users with a complete set of low-carbon solutions, the development space will continue to narrow. The overall solution can cover not only the supply of superfine high-activity auxiliary cementitious materials, but also the supply of calcined coal gangue, powdered coal gangue and other high-activity raw materials to provide support for the production of low-carbon cement, and further extend to the complete set of services such as formula verification, composition design, inspection and evaluation. Only by providing the whole chain of low-carbon cement solutions, can grinding station achieve sustainable development and growth. At present, the cement industry is facing the double test of energy saving, environmental protection and industrial intelligence upgrading. In order to implement the relevant policy requirements and accelerate the green low-carbon transformation and high-quality development of the cement industry, China Cement Network is scheduled for September 23-24. " held in Zibo, Shandong Province, this conference will bring together industry experts, business representatives and many industry stakeholders. Gather the wisdom of the group to promote energy conservation, environmental protection and intelligent transformation and upgrading of the cement industry. During this period, Ye Jiayuan will work with the delegates to discuss the development path of low-carbon cementitious materials in the cement industry and bring excellent reports. There will also be a tour of the Qingzhou conference.
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