关于高性能混凝土与聚烯纤维的盐损伤耐久性的研究
Zongao Qi1, Yan Liu1, Wei Zhang1
1College of Urban and Rural Construction, Hebei Agricultural University, Baoding 071001, China.
Materials (Basel, Switzerland)
|March 13, 2025
概括
添加聚烯纤维增强了海上混凝土的耐用性,防止盐和融损坏. 最佳的纤维含量提高了曲强度和抗化物透的抵抗力,这对北方沿海结构至关重要.
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.
- 结构的耐用性 结构的耐用性
背景情况:
- 北部沿海地区的海洋结构因化盐和融周期的联合暴露而面临严重的退化.
- 纤维增强是一种有前途的策略,可以提高混凝土在恶劣环境中的耐用性.
研究的目的:
- 研究聚烯纤维含量对高性能混凝土在盐结条件下的屈曲强度和耐久性的影响.
- 为了确定最佳的纤维剂量,以提高对环境压力因素的抵抗力.
主要方法:
- 在混凝土样本上进行了盐结循环测试.
- 使用四点负载曲试验评估的屈曲强度.
- 通过相对动态弹性模量,质量损失率和离子透性测试来评估耐用性.
- 使用扫描电子显微镜 (SEM) 进行微观结构分析.
主要成果:
- 聚烯纤维显著提高了曲强度和耐久性,达到最佳含量.
- 在0.9公斤/立方米的聚烯纤维时,达到最大的屈曲强度.
- 在1.2公斤/立方米纤维含量下观察到最佳的抵抗盐结和离子透性.
- 过度的纤维含量 (>0.9 kg/m3) 导致纤维凝聚,强度降低,孔隙性增加,损害耐用性.
结论:
- 适当添加聚烯纤维有效提高高性能混凝土的耐用性,防止盐和融攻击.
- 该研究为设计在北方沿海环境中具有挑战性的可持续海洋结构提供了关键数据.
- 确定了特定的纤维含量范围,以优化强度和耐腐蚀性.
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