Research on the additives to reduce radioactive pollutants in the building materials containing fly ash.
Several kinds of functional additives such as barite, zeolite, ferric oxide, gypsum, and high alumina cement were introduced to prepare a low-radiation cement-based composite to reduce radioactive pollutants contained in fly ash. The effect of content and granularity of the functional additives on the release of radioactive pollutants were investigated. Composites were characterized by X-ray diffraction, Scan electron microscopy. The results indicate that the radioactive pollutants contained in the fly ash can be reduced by adding a proper amount of zeolite, ferric oxide, gypsum, and high alumina cement. The release of radon from fly ash decreases with a decrease in the granularity of additives. Compared with traditional cement-based composite containing fly ash, the release of radon can be reduced 64.8% in these composites, and the release of gamma-ray is decreased 45%. Based on the microstructure and phase analysis, we think that by added functional additives, there are favorable to form self-absorption of radioactivity in the interior composites. This cement-based composite will conducive to fly ash are large-scale applied in the field of building materials.
He
Deng-liang
DL
College of Material Science and Engineering, Sichuan University, Chengdu 610064, China. hefei1979@21cn.com
Yin
Guang-fu
GF
Dong
Fa-qin
FQ
Liu
Lai-bao
LB
Luo
Ya-jun
YJ
D002244:Carbon / Q000032:analysis*; D060729:Coal Ash; D003252:Construction Materials / Q000032:analysis*; D007202:Indicators and Reagents; D052638:Particulate Matter / Q000032:analysis*; D011848:Radioactive Pollutants / Q000032:analysis*; D011850:Radioactive Waste / Q000517:prevention & control*; D011886:Radon / Q000032:analysis
D060729:Coal Ash; D007202:Indicators and Reagents; D052638:Particulate Matter; D011848:Radioactive Pollutants; D011850:Radioactive Waste; D002244:Carbon; D011886:Radon