洗聚合物污泥废物作为新型补充水泥材料的表征:实验研究和生命周期评估
Nausad Miyan1, Tarik Omur2, Senem Bilici2
1University of Rhode Island, Civil and Environmental Engineering, Kingston, RI, 02881, United States.
Journal of environmental management
|July 20, 2024
概括
洗聚合物污泥 (WAS) 可以在混凝土中取代普通波特兰水泥 (OPC). 经过处理的WAS显示了增强的pozzolanic活性,提高了砂的强度,并减少了可持续建筑的CO2排放.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 环境科学 环境科学
背景情况:
- 洗聚合物污泥 (WAS) 是聚合物采石场的废物产物.
- 研究WAS作为普通港式水泥 (OPC) 的部分替代品,涉及废物利用和可持续建筑材料.
- 了解WAS的pozzolanic特性和环境影响对于其有效应用至关重要.
研究的目的:
- 评估原始和经热处理的WAS作为OPC的部分替代品的潜力.
- 调查使用WAS在水泥材料中的pozzolanic活动和环境效益.
- 为了确定含有WAS的砂的机械性能和二氧化碳排放减少.
主要方法:
- 干燥,研磨和热处理 (700°C和900°C) 的WAS.
- 用原料和经过处理的 WAS 制备各种糊和砂混合物.
- 使用X射线衍射 (XRD),Frattini测试,压力强度测试和热分析进行Pozzolanic活动评估.
- 生命周期评估 (LCA) 用于二氧化碳排放评估.
主要成果:
- 无论是原始的还是经过处理的WAS都表现出pozzolanic活性,由减少的氧化度和存在的关键反应产物如酸水合物 (C-S-H) 证实.
- 与WAS (原料或经过处理) 混合的砂在所有测试年龄实现了压力强度超过参考砂的75%.
- 经过处理的WAS显示出比原始WAS更高的pozzolanic活性,由减少氧化的形成证明.
- 生命周期评估表明,含WAS的混合砂的二氧化碳排放量减少了.
结论:
- 洗聚合物污泥 (WAS) 显示出作为普通港地水泥 (OPC) 的可持续部分替代品的巨大潜力.
- 热处理增强了WAS的pozzolanic活性,从而在水泥应用中改善了机械性能和环境效益.
- 在砂中使用WAS为废物利用,减少二氧化碳足迹和提高建筑行业材料性能提供了有希望的解决方案.
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