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吉俊豪 ，宋少民 ，李   劭 ，彭    天 ，李金君 ，杜若萱 ，趙曉嬌 

（北京建筑大學 ，建筑結構與環境修復功能材料北京市重點實驗室 ，北京 100044)

摘   要：采用水泥固化劑和固廢基膠凝材料固化劑分別固化尾泥制備流態固化土，通過流動擴展度、凝結 時間、泌水率、流變性能和無側限抗壓強度試驗，探討水固比 、灰土比 、激發劑摻量和砂土比對尾泥流態固化土的工作性能和力學性能的影響。結果表明：水固比為 0. 62 ~ 0. 69 ,  摻量為 7% ~ 11% 水泥固化劑或 15% ~ 17%  GC 固化劑，制備尾泥流態固化土 28 d 抗壓強度在 0. 56 ~ 2. 10  MPa ,  滿足一般性非結構回填工程；水固比為 0. 62 , 激發劑摻量 20% ,  摻入再生細骨料優化顆粒級配并控制砂土比為 0. 3 時，GC  固化劑流態固化土流動擴展度為 265 mm , 28 d 抗壓強度達到 2. 66 MPa , 泌水率低于 3% ,  可滿足早強型結構性回填工程；拌合漿體黏度小于 0. 88 Pa ·s , 流態固化土拌合物泌水率較大；提出機制砂洗砂尾泥的流態固化土制備中可控的參數和膠凝材料 摻量。研究成果可為濕法機制砂尾泥再利用提供參考。

關鍵詞：機制砂尾泥 ；流態固化土 ；固廢基膠凝材料 ；流變性能 ；水固比

中圖分類號：TU528           

文獻標志碼：A            

文章編號： 1005- 8249   (2025)  02- 0018- 07 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .02.004

 

JI Junhao ,  SONG Shaomin ,  LI Shao ,  PENG Tian ,  LI Jinjun ,  DU Ruoxuan ,  ZHAO Xiaojiao

(Beijing University of Civil Engineering and Architecture ,  Beijing Key Laboratory of Building Structure and

Environmental Remediation Functional Materials ,  Beijing 100044)

Abstract：Fluidized solidified soil was prepared by stabilizing tailings sludge using cement curing agents and solid waste-based cementitious curing agents, respectively. The effects of water-solid ratio, binder-soil ratio, activator dosage, and sand-soil ratio on the workability and mechanical properties of the fluidized solidified tailings sludge were investigated through experiments on flow spread, setting time, bleeding rate, rheological properties, and unconfined compressive strength. The results indicate that: With a water-solid ratio of 0.62-0.69 and a dosage of 7%-11% cement curing agent or 15%-7% GC curing agent, the 28days strength of the fluidized solidified tailings sludge ranges from 0.56 to 2.10 MPa, meeting the requirements for general non-structural backfill engineering. For GC-cured fluidized soil optimized with a water-solid ratio of 0.62, 20% activator dosage, and controlled sand-soil ratio of 0.3 (incorporating recycled fine aggregates to improve particle gradation), the flow spread reaches 265 mm, the 28days strength attains 2.66 MPa, and the bleeding rate remains below 3%, fulfilling the criteria for early-strength structural backfill applications. When the viscosity of the mixed slurry is less than 0.88 Pa·s, the fluidized solidified soil mixture exhibits a higher probability of bleeding. Controllable parameters and recommended binder dosages for preparing fluidized solidified soil from machine-made sand washing tailings are proposed, providing references for diverse engineering scenarios.

Key words：tailings of mechanically crushed sand；flowable fill or self-compacting backfill；full waste-based cementitious materials；rheological properties；water-to-solid ratio

作者簡介： 吉俊豪  (1998—) ,  男，碩士研究生，研究方向：建筑材料。

通信作者：宋少民  (1965—) ,  男，碩士，教授，研究方向：現代混凝土材料。

收稿日期：2024 - 10 - 17