评估混凝土与棉花织品废料和碎的性能和微观结构
Nastasia Saca1, Lidia Radu1, Roxana Truşcă2
1Faculty of Roads, Railways and Bridges, Technical University of Civil Engineering, 020396 Bucharest, Romania.
Materials (Basel, Switzerland)
|October 28, 2023
概括
这项研究调查了在混凝土中使用棉花织废料 (CW) 和粉碎 (CB) 的情况. 虽然这些材料降低了导热率,但它们通常会降低混凝土的导热率.
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.
- 环境工程 环境工程
背景情况:
- 织和建筑行业产生大量的废物,包括棉花织废物 (CW) 和碎 (CB).
- 环境问题需要可持续的废物管理和建筑物材料利用解决方案.
- 天然沙是混凝土的关键组成部分,其部分用废料替代正在探索环境效益.
研究的目的:
- 评估将棉花织废弃物 (CW) 和碎 (CB) 作为混凝土中自然沙子的部分替代品的影响.
- 分析CW和CB对各种混凝土性能的影响,包括可加工性,密度,吸水性,导热性和机械强度.
- 确定CW和CB的最佳替换水平,以实现所需的具体性能特征.
主要方法:
- 混凝土混合物中CW和CB的重量比例各不相同 (1,2,5和10%),取代了天然的沙子 (50至100体积%).
- 进行了标准测试,以评估可加工性 (沉降),密度,吸水率,导热率和机械强度 (压缩和分裂).
- 电子显微镜被用于对混凝土样品的微观结构分析.
主要成果:
- 添加CW和CB增加了对水的需求,持续下降.
- 使用CW混凝土的混凝土显示密度,吸水率 (重量1%) 和裂裂强度 (重量1~2%) 得到改善.
- 压力强度随着CW含量增加而下降,CW和CB的联合使用降低了可加工性,密度和机械强度. 热导率通过CW和CB的添加而降低.
结论:
- 用CW和CB部分替换沙子可以降低混凝土的导热率,为节能建筑提供了潜力.
- 虽然CW在某些特定特性 (如裂变强度) 中表现出一些好处,但CW和CB通常会导致可加工性,密度和压力强度的降低.
- 需要进一步的研究来优化这些废物材料的使用,以平衡环境效益与具体性能.
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