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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2026, Vol. 45 ›› Issue (1): 237-245.DOI: 10.16552/j.cnki.issn1001-1625.2025.0739

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Preparation and Performance Optimization of Shield Mud-Based Non-Sintered Ceramsite

WANG Panpan1(), SUN Jinjin1, ZHANG Peiran1, YANG Qi1, WAN Xing2(), FENG Xu2, WANG Zhihua2, DING Jianwen3   

  1. 1. Sinohydro Bureau 7 Co. ,Ltd. ,Chengdu 610213,China
    2. School of Transportation Engineering,Nanjing Technological University,Nanjing 211816,China
    3. School of Transportation,Southeast University,Nanjing 211102,China
  • Received:2025-07-28 Revised:2025-09-05 Online:2026-01-20 Published:2026-02-10

Abstract:

Based on the shield mud sampled from landfill yard in Nanjing, the shield mud-based non-sintered ceramsite was prepared using the full-process wet materials and wet operation modes, where the injection molding and standard curing technology were adopted. Through the bulk density, water absorption rate and cylinder pressure strength tests, the influence laws of sulfate activator (gypsum), alkaline activator (sodium silicate) and modifier (sodium sulfate + triethanolamine, calcium sulfoaluminate, polypropylene fiber) on the physical and mechanical properties of non-sintered ceramsite were investigated. The results indicate that the optimal proportion (mass fraction) of gypsum and sodium silicate is 2%~6% and 5%~7%, respectively, and the optimal modifier proportion (mass fraction) is 1.0% sodium sulfate + 0.050% triethanolamine. The high-strength shield mud-based non-sintered ceramsite is prepared by reducing the soil-to-cement ratio and foam volume ratio with the optimal proportion of additives (7% gypsum, 4% sodium silicate, and 1.0% sodium sulfate + 0.050% triethanolamine). The bulk density of the high-strength non-sintered ceramsite is 821 kg/m3, the cylinder pressure strength approaches 9.6 MPa, and the water absorption rate within 1 h is only 4.2%, which meets the standard of high-strength lightweight coarse aggregate with a density grade of 900. The microscopic analysis shows that calcium silicate hydrate/calcium aluminosilicate hydrate gels and expansive ettringite are generated inside the high-strength non-sintered ceramsite, which are the main source of the strength. This study can provide theoretical and technical support for the resource utilization of shield mud.

Key words: shield mud, non-sintered ceramsite, additive, performance optimization, microscopic analysis

CLC Number: