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基于正交实验金尾矿砂再生混凝土实验研究

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李志强, 张轩硕, 卜娜蕊, 俞勇, 祝帆, 李堰江. 基于正交实验金尾矿砂再生混凝土实验研究[J]. 矿产综合利用, 2022, 43(6): 73-78, 83. doi: 10.3969/j.issn.1000-6532.2022.06.013
引用本文: 李志强, 张轩硕, 卜娜蕊, 俞勇, 祝帆, 李堰江. 基于正交实验金尾矿砂再生混凝土实验研究[J]. 矿产综合利用, 2022, 43(6): 73-78, 83. doi: 10.3969/j.issn.1000-6532.2022.06.013
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Li Zhiqiang, Zhang Xuanshuo, Bu Narui, Yu Yong, Zhu Fan, Li Yanjiang. Research on Orthogonal Test of Mixture Ratio of Gold Tailings Recycled Concrete[J]. Multipurpose Utilization of Mineral Resources, 2022, 43(6): 73-78, 83. doi: 10.3969/j.issn.1000-6532.2022.06.013
Citation: Li Zhiqiang, Zhang Xuanshuo, Bu Narui, Yu Yong, Zhu Fan, Li Yanjiang. Research on Orthogonal Test of Mixture Ratio of Gold Tailings Recycled Concrete[J]. Multipurpose Utilization of Mineral Resources, 2022, 43(6): 73-78, 83. doi: 10.3969/j.issn.1000-6532.2022.06.013
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基于正交实验金尾矿砂再生混凝土实验研究

  • 1.

    河北建筑工程学院土木工程学院，河北　张家口　075000

  • 2.

    河北省高校绿色建材与建筑改造应用技术研发中心，河北省土木工程诊断改造与抗灾重点实验室，河北　张家口　075000

  • 基金项目: 河北省人力资源和社会保障课题（A2016002028）
详细信息
    作者简介: 李志强（1975-）男，教授，研究方向为结构工程

  • 中图分类号: TD981; TU528

Research on Orthogonal Test of Mixture Ratio of Gold Tailings Recycled Concrete

  • 1.

    Hebei University of Civil Engineering and Architecture, School of Civil Engineering, Zhangjiakou, Hebei, China

  • 2.

    Research and Development Center of Green Building Materials and Building Renovation in Colleges and Universities of Hebei Province, Key Laboratory of Civil Engineering Diagnosis, Reconstruction and Disaster Resistance of Hebei Province, Zhangjiakou, Hebei, China

    摘要

  • 为缓解天然砂石资源短缺，采用正交实验对金尾矿砂再生混凝土进行力学研究，选取水灰比、金尾矿砂取代率、再生粗骨料取代率和粉煤灰掺量四个影响因素，得到了金尾矿砂再生混凝土抗压、抗拉强度两种性能指标，并基于力学性能进行了配比优化组合研究。结果表明：水灰比、粉煤灰掺量对两种评价指标影响显著，其次是金尾矿砂取代率，而二次破碎的再生粗骨料对二者影响较小。综合考虑配制金尾矿砂再生混凝土的较佳因素水平方案为水灰比0.45、金尾矿砂取代率30%、再生粗骨料取代率30%、粉煤灰掺量10%。通过对较佳配比浇筑的金尾矿砂再生混凝土与普通混凝土、再生混凝土的两种强度对比和微观分析可知，金尾矿砂应用于再生混凝土中是可行的。

    In order to alleviate the shortage of natural sand and gravel resources, an orthogonal test was used to study the mechanics of recycled concrete from gold tailings. Four influencing factors of water-cement ratio, gold tailing sand substitution rate, recycled coarse aggregate substitution rate and fly ash content were selected, and two performance indicators of compressive strength and tensile strength of gold tailing sand recycled concrete were obtained. The performance was also researched on the ratio optimization combination. Results showed that the water-cement ratio and the content of fly ash have significant effects on the two evaluation indexes, followed by the replacement rate of gold tailing sand, while the reclaimed coarse aggregate of secondary crushing has little effect on the two indexes. The optimal factor level scheme for the preparation of recycled concrete with gold tailing sand is the water-cement ratio of 0.45, the replacement rate of gold tailing sand, the replacement rate of recycled coarse aggregate of 30% and the content of fly ash of 10%. By comparing the strength of recycled concrete with ordinary concrete and recycled concrete with the best ratio of gold tailing sand, it can be seen that it is feasible to use gold tailing sand in recycled concrete.

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  • 图 1  金尾矿砂X射线衍射分析

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  各因素不同水平抗压强度变化值

    Figure 2. 

    下载: 全尺寸图片 幻灯片

    图 3  各因素不同水平劈裂抗拉强度变化值

    Figure 3. 

    下载: 全尺寸图片 幻灯片

    图 4  混凝土微观结构

    Figure 4. 

    下载: 全尺寸图片 幻灯片

    表 1  金尾矿砂主要化学成分/%

    Table 1.  Main chemical composition of gold tailings sand

    SiO2Al2O3CaOFe2O3MgONa2OTiO2K2O
    52.6517.559.849.044.133.321.481.47
    下载: 导出CSV

    表 2  金尾矿砂物化特性检测结果

    Table 2.  Test results of physical and chemical properties of gold tailings sand

    指标表观密度/（kg·m-3）吸水率/%云母含量/%轻物质含量/%氯离子含量/%硫化物含量/%有机物含量/%
    测量值2789.62.280.30.50.010.24合格
    规范标准--＜2.0＜1.0＜0.06＜1.0颜色不深于标准色
    下载: 导出CSV

    表 3  金尾矿砂放射性核素检测结果

    Table 3.  Radionuclide detection results of gold tailings sand

    核素名称比活度/
    （Bq·kg）    		内照射指数
    （IRa）    		外照射指数
    （Ir）
    226Ra1.80.00.1
    232Th6.7
    40K245.4
    下载: 导出CSV

    表 4  粗骨料的基本物理性质

    Table 4.  Basic physical properties of coarse aggregate

    骨料类型表观密度/
    （kg·m-3）    		堆积密度/
    （kg·m-3）    		吸水率/
    %    		含水率/
    %    		压碎指标/
    %
    天然粗骨料2659.61315.40.50.575.8
    再生粗骨料2510.21259.15.53.813.1
    下载: 导出CSV

    表 5  正交实验设计

    Table 5.  Orthogonal test design

    水平因素
    水灰比A金尾矿砂取
    代率B/%    		再生粗骨料
    取代率C/%    		粉煤灰掺量D/%
    10.4503010
    20.50305020
    30.55607030
    下载: 导出CSV

    表 6  金尾矿砂再生混凝土材料配合比

    Table 6.  Mix ratio of gold tailings sand recycled concrete materials

    编号组别材料用量/（kg·m-3）
    水泥水天然砂天然粗骨料再生粗骨料金尾矿砂粉煤灰
    Z-1A1B1C1D1390201.2637.8793.9340043.3
    Z-2A1B2C2D2346.6204.8446.5567566.9191.386.7
    Z-3A1B3C3D3303.3209.1255.1340793.9382.7130
    Z-4A2B1C2D3273204.8653.4580.8580.80117
    Z-5A2B2C3D1351209.1457.4348.5813.119639
    Z-6A2B3C1D2312201.2261.4813.1348.539278
    Z-7A3B1C3D2283.6209.1666.2355.3829070.9
    Z-8A3B2C1D3248.1201.2466.3829355.3199.9106.4
    Z-9A3B3C2D1319204.8266.5592.1592.2399.735.5
    下载: 导出CSV

    表 7  金尾矿砂再生混凝土正交实验强度值

    Table 7.  Orthogonal test strength value of recycled concrete with gold tailings sand

    编号组别影响因素实验结果
    水灰比A金尾矿砂取代率B/%再生粗骨料取代率C/%粉煤灰掺量D/%28 d抗压强度/MPa28 d劈裂抗拉强度/MPa
    Z-1A1B1C1D11（0.45）1（0）1（30）1（10） 38.203.33
    Z-2A1B2C2D21（0.45）2（30）2（50）2（20）37.073.21
    Z-3A1B3C3D31（0.45）3（60）3（70）3（30）33.922.66
    Z-4A2B1C2D32（0.50）1（0）2（50）3（30）33.802.6
    Z-5A2B2C3D12（0.50）2（30）3（70）1（10）37.323.14
    Z-6A2B3C1D22（0.50）3（60）1（30）2（20）35.532.68
    Z-7A3B1C3D23（0.55）1（0）3（70）2（20）30.272.35
    Z-8A3B2C1D33（0.55）2（30）1（30）3（30）30.012.42
    Z-9A3B3C2D13（0.55）3（60）2（50）1（10）31.792.35
    下载: 导出CSV

    表 8  实验结果极差分析结果

    Table 8.  Range analysis of test results

    水平立方体抗压强度劈裂抗拉强度
    ABCDABCD
    K1109.2102.2103.7107.39.28.38.48.8
    K2106.6104.4102.6102.98.48.88.28.2
    K392101.2101.597.77.17.78.17.7
    极差R17.23.22.29.62.11.10.31.1
    下载: 导出CSV

    表 9  金尾矿砂再生混凝土方差分析结果

    Table 9.  Variance analysis results of gold tailings sand recycled concrete

    检验指标方差来源平方和自由度均方差F显著性
    立方体抗压强度A170.734285.367356.930***
    B5.21322.60710.898*
    C2.47321.2365.169*
    D46.065223.03296.302**
    误差4.305180.236
    总计228.7926
    劈裂抗拉强度A2.20821.10449.761***
    B0.58520.29213.179**
    C0.05420.0271.221*
    D0.65020.32514.644**
    误差0.399180.022
    总计3.89626
    注：“*”为显著性影响程度等级
    下载: 导出CSV

    表 10  金尾矿砂再生混凝土优化方案及结果

    Table 10.  Optimization scheme and results of gold tailings sand recycled concrete

    混凝土类型水灰比金尾矿砂
    取代率/%    		再生粗骨料
    取代率/%    		粉煤灰
    掺量/%    		28 d立方体抗压
    强度/MPa    		28 d劈裂抗拉
    强度/MPa
    普通混凝土0.4500041.323.10
    再生混凝土0.450301038.202.83
    金尾矿砂再生混凝土0.4530301042.893.57
    下载: 导出CSV

    表 11  金尾矿砂再生混凝土化学成分/%

    Table 11.  Chemical composition of recycled concrete from gold tailings sand

    SiO2CaOAl2O3Fe2O3MgOK2OSO3Na2OTiO2
    38.5631.7312.526.633.392.171.711.380.84
    下载: 导出CSV
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收稿日期:  2021-08-17
刊出日期:  2022-12-25

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