使用地下煤底灰/废料作为可持续混凝土基础设施的水泥替代品
Sandip Poudel1, Samrawit Menda2, Joe Useldinger-Hoefs3
1Red River Valley Alliance LLC, 4816 Amber Valley Pkwy S, Fargo, ND 58102, USA.
Materials (Basel, Switzerland)
|May 25, 2024
概括
地下煤的副产品,如煤底灰 (CBA) 和煤炉渣 (CBS),可以替代混凝土中的水泥. 最佳的混合物可以提高混凝土的强度和耐久性,同时减少对环境的影响.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 土木工程 土木工程是指土木工程.
背景情况:
- 由于排放,水泥生产是能源密集型和对环境有害的.
- 煤底灰 (CBA) 和煤炉渣 (CBS) 是工业副产品,具有波佐兰性质.
- 在混凝土中使用CBA和CBS可以减少垃圾填埋垃圾,并节约自然资源.
研究的目的:
- 在混凝土中确定地面CBA (GCBA) 和地面CBS (GCBS) 的最佳替换百分比.
- 评估结合GCBA和GCBS的混凝土的机械性能和耐用性.
- 研究纳米粘土和细度对基于GCBA的混凝土和砂性能的影响.
主要方法:
- 机械研磨CBA和CBS以产生GCBA和GCBS.
- 优化水泥更换水平:10%的GCBA和5%的GCBS.
- 评估混凝土的性能,包括抗拉强度,弹性模量,耐久性和化物透阻力 (快速透测试).
- 研究添加2.5%的纳米粘土和不同的GCBA细度 (高达3072g/cm2) 的影响.
主要成果:
- 基于GCBA的混凝土显示出比控制更好的拉伸强度,弹性模量和耐久性.
- 10%的GCBA混凝土对化物透具有显著更高的抗性 (2026库伦比3405库伦).
- 包括2.5%的纳米粘土增加了5%的最佳GCBA含量和4MPa的压力强度.
- 最好的GCBA (L1,3072 g/cm2) 产生了最大的砂压力强度 (32.7 MPa).
- 砂强度随着GCBA和GCBS细度的增加,具有ASTM C618符合性增强性质.
结论:
- 最佳的水泥替代水平为10%的GCBA和5%的GCBS,以提高混凝土的性能.
- GCBA和GCBS是可行的补充水泥材料,可以提高混凝土的性能和可持续性.
- 精度是一个关键因素;满足ASTM C618标准最大限度地提高了在混凝土和砂中使用这些煤炭副产品的好处.
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