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| 黄金尾矿细骨料对水泥砂浆碱-硅酸盐反应的影响 |
| Effect of Gold Tailings Fine Aggregate on Alkali-silica Reaction in Cement Mortars |
| 投稿时间：2026-04-09 |
| DOI：10.16018/j.cnki.cn32-1650/n.202602003 |
| 中文关键词: 黄金尾矿 砂浆 碱骨料反应 体积膨胀 |
| 英文关键词: gold tailings mortar alkali-aggregate reaction volume expansion |
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| 摘要点击次数: 2 |
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| 中文摘要: |
| 黄金尾矿骨料替代天然砂石制备混凝土既可减少天然骨料开采,又可缓解黄金尾矿处置堆存问题。本文研究了黄金尾矿细骨料在水泥砂浆中的碱骨料反应。结果表明,黄金尾矿细骨料的碱骨料反应活性较低,养护120 d后膨胀率仅为-0.046%;骨料颗粒与水泥基体紧密连接,界面无明显碱硅酸盐凝胶相产物生成,骨料内部也无明显膨胀微裂纹。黄金尾矿中溶出的活性铝质组分参与碱硅酸盐反应,生成了碱铝硅酸盐凝胶相,这可能是抑制碱骨料膨胀的主要原因之一。本研究通过多尺度表征证实,黄金尾矿细骨料可替代100%天然砂用于水泥砂浆,在保障抗压强度(120 d达55.4 MPa)的同时抑制硅酸盐反应膨胀(<0.1%),为黄金尾矿在混凝土制品的资源化应用提供了理论支撑。 |
| 英文摘要: |
| Replacing natural sand with gold tailings aggregate for preparing concrete can both reduce the mining of natural aggregate and alleviate the disposal and stockpiling problems of gold tailings. This paper investigates the alkali-aggregate reaction of gold tailings fine aggregate in cement mortar. The results show that the alkali-aggregate reaction activity of the gold tailings fine aggregate is low, and the expansion rate is only -0.046% after 120 days of curing; the aggregate particles are tightly connected with the cement matrix, with no obvious alkali-silicate gel phase products generated at the interface, and no obvious expansion microcracks inside the aggregate. The active aluminum components leached from the gold tailings participate in the alkali-silicate reaction and generate an alkali-aluminum-silicate gel phase, which may be one of the main reasons for inhibiting the alkali-aggregate expansion. Through multi-scale characterization, this study confirms that gold tailings fine aggregate can replace 100% of natural sand in cement mortar, ensuring the compressive strength (reaching 55.4 MPa at 120 days) while inhibiting the silicate reaction expansion (<0.1%), which provides theoretical support for the resource utilization of gold tailings in concrete products. |
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