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Experimental Study on the Preparation of Non-fired Building Materials by Recycling Shield Muck in Silty Clay Stratum
(1. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031;2. Jiangsu Transportation Engineering Construction Bureau, Nanjing 210000; 3. China Design Group Co., Ltd., Nanjing 210005;4. China Railway 14th Bureau Group Mega Shield Construction Engineering Co., Ltd., Jinan 250014)
Abstract To address issues such as the difficulty of disposing of and environmental pollution caused by the waste slurry in shield tunnelling, as well as the difficulty of recycling, the muck from the pressure filtration treatment of the shield tunnel waste slurry in clayey soil layers was taken as the research object to propose a scheme for preparing non-fired building materials using the muck. The study investigated the influence of different solidifying agent systems on the uniaxial compressive strength of non-fired sample and obtained the optimal solidifying agent type, mixing ratio, and reasonable amount of river sand addition. The results of the study show that (1) the technology of preparing non-fired building materials using muck from shield tunnel waste slurry pressure filtration treatment is feasible and practical, and the strength of the produced non-fired sample meets the requirements of product grade MU15 in"JC/T422-2007"; (2) the strength of non-fired sample using cement as the solidifying agent is significantly higher than that of using lime, and the optimal strength is achieved when the cement content is between 20% and 30%; (3) the ratio of cement to lime in the composite curing agent should be 3∶1 to achieve the best curing effect; (4) when the muck to river sand mixing ratio is 3∶1, the waste residue can be utilized to the greatest extent, and the strength and durability of the non-fired sample meet the strength and durability indicators required by the specifications.
Abstract：
To address issues such as the difficulty of disposing of and environmental pollution caused by the waste slurry in shield tunnelling, as well as the difficulty of recycling, the muck from the pressure filtration treatment of the shield tunnel waste slurry in clayey soil layers was taken as the research object to propose a scheme for preparing non-fired building materials using the muck. The study investigated the influence of different solidifying agent systems on the uniaxial compressive strength of non-fired sample and obtained the optimal solidifying agent type, mixing ratio, and reasonable amount of river sand addition. The results of the study show that (1) the technology of preparing non-fired building materials using muck from shield tunnel waste slurry pressure filtration treatment is feasible and practical, and the strength of the produced non-fired sample meets the requirements of product grade MU15 in"JC/T422-2007"; (2) the strength of non-fired sample using cement as the solidifying agent is significantly higher than that of using lime, and the optimal strength is achieved when the cement content is between 20% and 30%; (3) the ratio of cement to lime in the composite curing agent should be 3∶1 to achieve the best curing effect; (4) when the muck to river sand mixing ratio is 3∶1, the waste residue can be utilized to the greatest extent, and the strength and durability of the non-fired sample meet the strength and durability indicators required by the specifications.
TIAN Yang1 CHEN Yan1 FANG Ruoquan2 LIU Jie3 SU Ang2 YOU Shaoqiang4 FANG Yong1
.Experimental Study on the Preparation of Non-fired Building Materials by Recycling Shield Muck in Silty Clay Stratum[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(5): 269-276
2023, Vol. 60 