Radon Reduction Performance of Adsorbent for Making Radon-Reducing Functional Board

라돈 저감형 기능성 보드제작을 위한 흡착재의 라돈 저감 성능

Abstract

In this study, an experiment was conducted to evaluate the properties of cement matrix using diatomite and silica gel as adsorbents of radon. The adsorption properties of diatomite of a natural adsorbent and silica gel of an artificial sorbent were examined to confirm the reduction of radon gas concentration of the removal of radon gas in the indoor environment of the human body. We conducted a performance evaluation for the study. The fluidity, air content, density, absorption, flexural failure load, thermal conductivity and radon gas concentration of the specimen using diatomite and silica gel were measured. the fluidity and the air content of the adsorbed matrix with diatomite were decreased as the diatomite replacement ratio increased. Which seems to affect the subsequent matrix by the absorption of the compounding water of diatomite. As the replacement rate of silica gel increased, the fluidity decreased and the air content increased up to constant replacement rate. It is judged that the surface of the silica gel has a critical point at which it can react with moisture.

본 연구는 최근 방사능 물질의 위험성에 대한 관심이 커지며 원전사고 등의 대규모 인명 피해와 위험지역 선정 등의 이유로 인체의 방사능 안전성에 대한 관심이 커지면서 요구되는 실내 건축용 마감재에 대한 것이다. 일상에서 방사능에 노출되는 여러 가능성 중 실내 공기 중 라돈가스에 대한 관심이 커지면서 라돈가스 흡착형 경화체에 대한 기초연구 자료를 제시한다. 본 연구에 흡착재로 활용된 재료는 규조토와 실리카겔로, 천연 흡착재인 규조토와 인공 흡착재인 실리카겔의 기초 성능 및 흡착 성능을 평가하였다. 향후 실내 공기 중 라돈가스 농도 저감에 대한 정밀한 추가 실험에 대한 연구결과가 필요할 것으로 예상되고, 실험결과에 따른 인공 흡착재인 실리카겔의 라돈가스 흡착 가능성을 기대한다.

Figure 1. The incidence of lung cancer and annual deaths

Figure 2. Micropores of anthracite

Figure 3. Thermal conductivity measuring instrument and radon gas measurement chamber

Figure 4. Flow of paste according to replacement ratio of diatomite

Figure 5. Air content of paste according to replacement ratio of diatomite

Figure 6. Density and water absorption rate of absorption matrix according to replacement ratio of diatomite

Figure 7. Flexural failure of absorption matrix according to replacement ratio of diatomite

Figure 8. Thermal conductivity of absorption matrix according to replacement ratio of diatomite

Figure 9. Concentration of radon gas of absorption matrix according replacement ratio of diatomite

Figure 10. Flow of paste according to replacement ratio of silica gel

Figure 11. Air content of paste accordign to replacement ratio of silica gel

Figure 12. Density and water absorption rate of absorption matrix according to replacement ratio of silica gel

Figure 13. Flexural failure of absorption matrix according to replacement ratio of silica gel

Figure 14. Thermal conductivity of absorption matrix according to replacement ratio of silica gel

Figure 15. Concentration of radon gas of absorption matrix according to replacement ratio of silica gel

Table 1. Chemical compositions of OPC

Table 2. Chemical compositions of diatomite

Table 3. Chemical compositions of silica gel

Table 6. Standard of gypsum board product ‘KS F 3504’

Table 4. Experimental factors and levels of radon adsorption type specimen with diatomite replacement ratio

Table 5. Experimental factors and levels of radon adsorption type specimen with silica gel replacement ratio