, 2026, the concrete prepared by Professor Yin Suhong, School of Materials Science and Engineering, South China University of Technology, in conjunction with Guangzhou Metro and Guangdong Huatong Construction Group Co., Ltd. was successfully poured in Guangzhou Metro Project. It has realized the first engineering application of green low-carbon cementitious materials prepared from shield dregs and tailings in China. This is another scientific research achievement of Professor Yin Suhong's team after the first application of C130 ultra-high performance pumping machine-made sand concrete in physical engineering in 2021. The
construction site
in China produces a huge amount of shield muck of more than 3000m3 every year. After the sand and stone are washed and screened out, the remaining mud is difficult to use, which has become one of the important problems in subway construction. The existing tail mud utilization mode has the problems that the consumption is small, and the influence of organic polymers doped in the shield and washing processes on the environment can not be properly solved.
The research group proposed to produce LC3 cement with shield tail mud, which can not only absorb a large amount of shield tail mud, but also decompose the organic polymer completely by calcination at 800 ℃, thus solving the above problems. Relevant research has been approved by the Department of Housing and Construction of Guangdong Province and Guangzhou Metro Group. Based on the investigation of the stratum of Fangbai Intercity Line in Guangzhou, the analysis of more than 20 core samples and mud samples of shield tailings, combined with relevant literature, the technical requirements of mud for the production of LC3 are determined, and the calcination system and performance of mud in the presence of multi-source clay minerals are determined through laboratory research; Then, after going through difficulties to find an enterprise for pilot production test, 50 tons of LC ³ were prepared through pilot production links such as calcination, grinding and mixing; the performance of LC ³ cement was studied, which met the technical requirements of 42.5 grade cement; the working performance, mechanical properties and durability of concrete were studied, all indicators met the design requirements, and the data were stable and reliable. After two years of continuous research, it has finally been successfully applied to the construction of Guangzhou Metro.
LC3 (Limestone Calcined Clay Cement) is one of the low-carbon cementitious materials with the most potential for large-scale promotion in the current cement industry. The core is to use the combination of calcined clay and limestone to replace up to 50% of the high-carbon emission clinker in traditional Portland cement. LC3 has the advantages of lower cost, significant carbon reduction and better performance. It can be directly produced by the existing cement production line without large-scale technical transformation. The production cost can be reduced by up to 25%, and the carbon emission can be directly reduced by up to 40%. The mechanical properties and impermeability of LC3 are better than those of ordinary cement. High-quality kaolinite clay is usually used as raw material to prepare LC3. In this project, the shield tail mud is used to replace kaolinite clay to prepare LC3, which not only realizes the resource utilization of shield tail mud, but also broadens the raw material source of LC3, further reduces the production cost, and provides a reference for the green low-carbon sustainable development of cement industry. Preparation of LC3 cement
by calcination of
shield tail mud This time, the shield tail mud of Fangbai Intercity Line is used to prepare LC3, and then LC3 is used to prepare C35 strength grade concrete for the pouring of the support beam of the enclosure structure of Rainbow Bridge Station of Fangbai Intercity Line. This is not only the first engineering application of LC3 prepared by metro shield tail mud in China, but also a typical case of applying the construction waste produced by the project in the same project, which provides a demonstration for the green, low-carbon and high-quality development of metro construction.
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