工业镍铁渣的路用特性及原位试验研究

贺炜; 刘剑锋; 尹平保; 陈彦虎; 杨文斌; 陈宇林; 吴永昌

doi:10.11779/CJGE201910004

工业镍铁渣的路用特性及原位试验研究 English Version

1. 长沙理工大学土木工程学院,湖南长沙 410114;
2. 广东广青金属科技有限公司,广东阳江 529533;
3. 广州建设工程质量安全检测中心有限公司,广东广州 510000

详细信息

作者简介:
贺炜(1982—),男,教授,硕士生导师,主要从事岩土工程防灾减灾及深基础工程方面教学和科研工作。E-mail：wadeho@csust.edu.cn。

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出版历程
- 收稿日期: 2019-02-11
- 发布日期: 2019-10-24

Properties and field tests of industrial ferro-nickel slag for roads

1. Civil Engineering College, Changsha University of Science and Technology, Changsha 410114, China;
2. Guangdong Guangqing Metal Technology Co., Ltd., Yangjiang 529533, China;
3. Guangzhou Construction Engineering Quality Security Testing Center Ltd., Guangzhou 510000, China

摘要

摘要: 综合采用室内和原位试验研究了工业镍铁渣作为路基填料的适用性。首先实测并统计了不同地区工业镍铁渣的化学成分,分析得到了其主要组分及变异性;同时在室内开展了不同击实条件下的颗粒特性、抗剪强度指标、CBR、压蒸粉化率及回弹模量试验,探讨了不同应用条件下工业镍铁渣的力学特性及路用指标。在此基础上,设计并实施了镍铁渣路堤足尺原位试验,实测了施工期及工后路堤沉降量、水平位移及孔隙水压力的发展规律,并基于有害物检测试验结果评价了环境影响评价。研究结果表明：镍铁渣主要由SiO₂、MgO、和CaO 3种成分组成,其中游离态MgO与CaO具有一定膨胀性,用于填料前须确保浸水膨胀率不大于2%;镍铁渣为级配不良砾土,标准击实功下其颗粒级配变化较小,掺配10%~20%的黏土有利于改善其路用性能指标。原位试验结果表明,采用土工加筋路堤方式应用镍铁渣效果较好,监测获得的路基变形量在施工初期即可稳定,施工后期及工后变形较小,渗透性好,孔隙水压力可即时消散。根据镍铁渣环境有害物质检出值,其为一般工业固体废物,可直接入场（非预处理）填埋,符合路基填料的环保要求。综合力学及环境试验结果可知,镍铁渣进行适当改良或处理后可直接作为路基填料使用。
- 道路工程 /
- 镍铁渣 /
- 路用特性 /
- 足尺原位试验
Abstract: The adaptability of industrial ferro-nickle slag as road fill is studied using the laboratory and field tests. Firstly, chemical compositions of industrial ferro-nickel slag from various districts are tested and statistically analyzed to examine the main components and the relevant variability. The slag is then tested in laboratory to obtain particle characteristics (under different compaction efforts), shear strength index, CBR, percentage of powered slag in autoclave and resilient modulus, thus the mechanical behavior and index as road fills are evaluated. Based on this, full-scale field tests on ferro-nickel slag embankment are designed and implemented. The embankment settlement, deflection and pore water pressure are monitored during and after construction, and harmful substances are detected to assess their environmental impact. The study indicates that the ferro-nickel slags is largely composed of three components: SiO₂, MgO, and CaO. The MgO and CaO at free stage are expansive to some extent, therefore the soaked expansion of the slag shall be tested before adopted in roads. The ferro-nickel slag is defined as poorly graded gravel, with minor change of grading under standard compaction effort. The behavior of the slag as road fill can be improved by being mixed with clay of 10%~20% by mass. The field tests indicate that the ferro-nickel slag can be successfully applied in reinforced embankment. The monitoring settlement becomes stable at the initial stage of construction, and minor settlement occurs thereafter. The slag is highly premeable, thus the excess pore water pressure can be dissipiated immediately. According to the detected harmful substances, the ferro-nickel slag is a general industrial solid waste, which is conforming to the environmental requirements as road fills, and can be buried directly (no pre-processing required). According to the mechanical and environmental tests, the ferro-nickel slag is able to be adopted as road fills after appropriate improvement.
- road engineering /
- ferro-nickel slag /
- index of road fill /
- full-scale field test

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参考文献(29)

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