关于含有回收聚合物和石灰岩的自我压缩混凝土的完整描述
Meriem Guessoum1, Fouad Boukhelf1, Fouzia Khadraoui1
1Builders Ecole d'Ingénieurs, Builders Lab, ComUE NU (Communauté Universitaire de Normandie Université), 1 Rue Pierre et Marie Curie, 14610 Epron, France.
Materials (Basel, Switzerland)
|September 9, 2023
概括
本研究研究了使用回收聚合物 (RA) 和石灰石填充剂的自压缩混凝土 (SCC). 结果显示RA影响新鲜性质,但没有硬化强度,耐久性受RA含量和孔隙性的影响.
科学领域:
- 土木工程 土木工程是指土木工程.
- 材料科学 材料科学 材料科学
- 可持续建筑 可持续建筑
背景情况:
- 建筑和拆除废物对环境构成重大挑战.
- 回收聚合物 (RAs) 在混凝土生产中为天然聚合物 (NAs) 提供了一个可持续的替代品.
- 石灰石填料可以部分取代水泥,减少混凝土的碳足迹.
研究的目的:
- 评估自压缩混凝土 (SCC) 的性能,其中包括循环聚合物 (RA) 和石灰石填料.
- 用不同的RA替代率来表征SCC的新鲜和硬化的特性.
- 评估这些创新的混凝土混合物在冷解周期和碳化过程中的耐用性.
主要方法:
- 开发了四个SCC混合设计,其中NAs被RAs部分替换,水泥用石灰石填充剂.
- 评估的新鲜性质:沉流量,的稳定性和t500粘度.
- 评估的硬化性能:压力强度,多孔性,温度测量分析,抗解,加快碳化.
主要成果:
- 回收聚合物减少了沉流量,但由于优化混合物设计,没有损害压力强度 (30-35 MPa).
- 所有SCC混合物在300个结解周期后都保持了视觉完整性,尽管有轻微的质量损失和应变增加.
- 碳化深度受到聚合物替代速度的显著影响,这与微观结构的多孔性变化有关.
结论:
- 使用回收聚合物和石灰石填充剂的自压缩混凝土是一种可行的可持续建筑材料.
- 优化的混合设计可以保持所需的机械性能,尽管使用回收材料.
- 对微观结构和多孔性的进一步研究对于预测回收聚合物混凝土的长期耐用性至关重要.
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