欢迎访问《硅酸盐通报》官方网站,今天是

硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (1): 237-245.DOI: 10.16552/j.cnki.issn1001-1625.2025.0739

• 资源综合利用 • 上一篇    下一篇

盾构渣土基免烧陶粒的制备与性能优化研究

王盼盼1(), 孙津津1, 张培冉1, 杨琦1, 万星2(), 封旭2, 王志华2, 丁建文3   

  1. 1.中国水利水电第七工程局有限公司,成都 610213
    2.南京工业大学交通运输工程学院,南京 211816
    3.东南大学交通学院,南京 211102
  • 收稿日期:2025-07-28 修订日期:2025-09-05 出版日期:2026-01-20 发布日期:2026-02-10
  • 通信作者: 万 星,博士。E-mail:wxing94720@njtech.edu.cn
  • 作者简介:王盼盼(1986—),男,高级工程师。主要从事再生绿色低碳轻质固化材料的研究。E-mail:393146235@qq.com
  • 基金资助:
    国家自然科学基金(52508386);国家自然科学基金(52378330)

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 Published:2026-01-20 Online:2026-02-10

摘要:

以南京某渣土处理场的盾构渣土为基材,采用全流程“湿料湿作”模式,结合注浆成型与标准养护技术制备了盾构渣土基免烧陶粒。通过堆积密度、吸水率、筒压强度试验,研究了硫酸盐激发剂(石膏)、碱性激发剂(水玻璃)及改性剂(硫酸钠+三乙醇胺、硫铝酸钙、聚丙烯纤维)等外加剂对免烧陶粒物理力学性能的影响规律。试验表明,石膏与水玻璃的最优掺量(质量分数)分别为2%~6%与5%~7%,改性剂最优配比(质量分数)为1.0%硫酸钠+0.050%三乙醇胺。通过减小土灰比与泡沫体积比,并采用优化后的外加剂配比(7%石膏、4%水玻璃、1.0%硫酸钠+0.050%三乙醇胺)制备了高强盾构渣土基免烧陶粒,高强免烧陶粒的堆积密度为821 kg/m3,筒压强度可达9.6 MPa,1 h吸水率仅为4.2%,符合900密度等级高强轻粗集料标准。微观测试结果表明,高强免烧陶粒内部生成了水化硅酸钙/水化硅铝酸钙凝胶与膨胀性的钙矾石,它们是免烧陶粒强度的主要来源。研究可为盾构渣土的资源化利用提供理论与技术参考。

关键词: 盾构渣土, 免烧陶粒, 外加剂, 性能优化, 微观分析

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

中图分类号: