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分级细尾砂胶结充填料的水化特性与早期强度演化

Hydration Characteristics and Early Strength Evolution of Classified Fine Tailings Cemented Backfill.

作者信息

Kou Yunpeng, Deng Yuchao, Tan Yuye, Han Chongchong, Song Weidong

机构信息

Key Laboratory of the Ministry of Education for High Efficient Mining and Safety in Mental Mines, Beijing 100083, China.

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China.

出版信息

Materials (Basel). 2023 Jan 20;16(3):963. doi: 10.3390/ma16030963.

DOI:10.3390/ma16030963
PMID:36769970
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9919374/
Abstract

To explore the hydration characteristics and early strength evolution of classified fine tailings cemented backfill (CFTCB), a nuclear magnetic resonance (NMR) analysis and a volume resistivity test were performed on classified fine tailings filling slurry (CFTFS). The early hydration products of CFTCB were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD) phase analysis. Uniaxial compressive strength (UCS) test was carried out, and the microscopic characteristics and strength rules of the hydration reaction of CFTCB were analyzed. Based on the experiment, we found the law of water content change and porosity evolution. The early hydration reaction can be divided into the dissolution, setting, and hardening stages. The volume resistivity test results show that the volume resistance of filling slurry increases slowly at first then decreases, and finally increases rapidly. The variation trend of volume resistivity is related to the degree of hydration reaction. When combined with the hydration characteristics of backfill materials, the hydration reaction rate determines the growth rate of early strength of backfill, and the formation of hydration products is the reason for the early strength increase in backfill. The research conclusion has an important theoretical guiding value and engineering significance in mine filling production organization and filling ratio parameter optimization.

摘要

为探究分级细尾砂胶结充填体（CFTCB）的水化特性和早期强度演化规律，对分级细尾砂充填料浆（CFTFS）进行了核磁共振（NMR）分析和体积电阻率测试。通过扫描电子显微镜（SEM）和X射线衍射（XRD）相分析研究了CFTCB的早期水化产物。进行了单轴抗压强度（UCS）试验，分析了CFTCB水化反应的微观特征和强度规律。基于试验，得出了含水量变化和孔隙率演化规律。早期水化反应可分为溶解、凝结和硬化阶段。体积电阻率测试结果表明，充填料浆的体积电阻先缓慢增加，然后减小，最后迅速增加。体积电阻率的变化趋势与水化反应程度有关。结合充填材料的水化特性，水化反应速率决定了充填体早期强度的增长速率，水化产物的形成是充填体早期强度增加的原因。该研究结论对矿山充填生产组织和充填比参数优化具有重要的理论指导价值和工程意义。

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