在不同纤维类型和度下,基于泡水泥的尾部填充器的微观结构演变和机械行为
Tingting Jiang1, Shuai Cao2, Erol Yilmaz3
1School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Environmental science and pollution research international
|August 14, 2024
概括
将玻璃,聚烯和玄武岩等纤维添加到泡式水泥基尾矿回料填充中,可以显著提高其强度和柔性. 含量为0.3%的玻璃纤维产生了最好的结果,提高了矿山应用的机械性能.
科学领域:
- 材料科学与工程 材料科学与工程
- 地质技术工程 地质技术工程
- 环境工程 环境工程
背景情况:
- 工业固体废物,特别是矿山尾矿,由于持续的废物产生,造成了重大的全球生态挑战.
- 在矿山填充生产中使用尾矿提供了一个经济的解决方案,并解决了处置问题.
- 基于泡水泥的尾矿回填 (FCTB) 是一种轻量级,流动和隔热的矿山填充物,但它缺乏足够的强度.
研究的目的:
- 为了研究机械性能,能量演变,延展性和纤维增强泡混凝土尾矿回填 (FR-FCTB) 的微观结构.
- 评估聚烯,玻璃和玄武岩纤维在提高FCTB性能方面的有效性.
- 在FR-FCTB中确定最佳的纤维含量,以提高金属矿应用的强度和可塑性.
主要方法:
- 制备FR-FCTB使用尾矿,水泥,水,泡剂 (dodecyltrimethylammonium化物) 和三种类型的纤维 (聚烯,玻璃,玄武岩).
- 单轴压缩试验 (UCS) 用于评估机械性能.
- 扫描电子显微镜 (SEM) 用于分析微观结构和水化产品.
主要成果:
- 纤维对FCTB的增强作用按照以下顺序进行:玻璃 > 聚烯 > 玄武岩.
- 发现FR-FCTB的最佳纤维含量为0.3%,而玻璃纤维增强将UCS增加18.1%,达到0.85MPa.
- 纤维添加增强了柔性,性和储能极限,而纤维的桥梁效应减轻了裂的传播.
结论:
- 纤维增强显著提高了基于泡水泥的尾矿的强度,柔性和性.
- 含量为0.3%的玻璃纤维在机械性能方面提供了最实质性的增强.
- 这些发现为FR-FCTB在金属矿的工业应用提供了宝贵的见解,提供了可持续的废物管理解决方案.
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