垃圾焚烧飞灰在绿色超高性能混凝土中的应用

Application of Municipal Solid Waste Incineration Fly Ash in Green Ultra-high Performance Concrete

城市生活垃圾焚烧飞灰中重金属离子的浸出会对环境造成严重污染,因此该文对超高性能混凝土固化焚烧飞灰的可行性进行了研究。试验分析了当垃圾焚烧飞灰掺量为10%时,改变硅灰掺量对于飞灰超高性能混凝土性能的影响。采用力学性能测试、扫描电子显微镜和电感耦合等离子体质谱等测试方法对飞灰超高性能混凝土的力学性能、微观结构和重金属浸出浓度进行了测试分析。试验结果表明:硅灰掺量为25%时,飞灰超高性能混凝土的机械强度最高,微结构最为密实,并且孔隙率最低。此外,超高性能混凝土拥有致密的微结构和极低的渗透性,对垃圾焚烧飞灰重金属离子的固化能力较强。因此,合理利用生活垃圾焚烧飞灰能制备出性能良好的生态型超高性能混凝土。

The leaching of heavy metal ions from municipal solid waste incineration fly ash(MSWI-FA)will cause serious pollution to the environment,so the feasibility of ultra-high performance concrete solidification MSWI-FA was studied.The influence of silica fume content on the performance of ultra-high performance concrete with 10%MSWI-FA was studied in this study.The mechanical properties,microstructure and heavy metal leaching of ultra-high performance concrete were studied by mechanical properties testing,scanning electron microscopy and inductively coupled plasma mass spectrometry.The test results show that the MSWI-FA ultra high performance concrete with 10%silica fume has the highest mechanical strength,the densest microstructure and the lowest porosity.In addition,ultra-high performance concrete has dense microstructure and extremely low permeability,and has a strong immobilization ability for heavy metal ions of MSWI-FA.Therefore,the eco-friendly ultra high performance concrete with good performance can be prepared by reasonable utilization of MSWI-FA.