摘要
介绍了一种用复合砂浆来降低楼房内混凝土材料所释放的氡气浓度的方法 ,进行了实验室试验和实际楼房的试验研究。实验室的试验中 ,利用扫描电子显微镜 ( SEM)等现代微观分析方法 ,探讨了楼房内部混凝土材料所释放的氡气来源 ,用不同的方法测试了复合砂浆的有效性。结果表明 ,该材料具有良好的阻止氡释放的能力和优良的屏蔽放射线的作用 ,同时也兼备普通砂浆的力学强度等性能 ,以及与普通砂浆基本相同的使用方法 ;实际楼房的试验现场是某高层住宅楼房内一个约 60 m2的单元房 ,用阿尔法轨迹仪检测 ,封闭一周后本底氡浓度达 2 50 0 Bq/m3,应用本材料后氡浓度减至 2 0 0 Bq/ m3,平均减少 90 %。
This paper describes a method of using a composite mortar to reduce radon concentrations emitted from concrete within building structures,which has been experimented with laboratory and on site field tests.Laboratory tests include the use of modern microstructure analysis techniques such as Scanning Electron Microscopy(SEM) to investigate the sources of radon emitted from the internal structure of concrete and the use of various methods to measure the effectiveness of the composite mortar in blocking radon emission.The findings confirm that the composite mortar exhibits good radon mitigation and excellent radiation screening abilities.Meanwhile,a good mechanical behavior is demonstrated and the application procedure of the composite mortar can be same as that of ordinary cement mortar.The on site field test was conducted using alpha track detectors in a 60 m 2 residential flat sealed for one week,where the radon concentration had reached 2 500 Bq/m 3.After the application of the composite mortar,the concentration was reduced to 200 Bq/m 3,meaning an average of 90% reduction.
出处
《辐射防护通讯》
2001年第1期15-19,40,共6页
Radiation Protection Bulletin
关键词
氡释放
复合砂浆
建筑物
混凝土
防治
氡污染
放射性污染
Check radon release Microstructure analysis Co mortar Tall residential flat Field Test
