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以氡屏蔽率为主要评判指标,研究水泥加入量对煤渣/粉煤灰砖氡释放的影响;使用自制的防氡涂料研究涂层厚度对煤渣/粉煤灰砖氡释放的影响。结果表明:随着水泥加入量的增加,不同水泥量模块的氡析出浓度先明显增加,水泥加入量35%时,模块析出氡浓度达到最大值,然后呈缓慢下降趋势;随涂覆厚度的增加,防氡效率上升,当涂覆厚度为2.0 mm时,防氡效率为98.96%。机理研究表明:水泥量增加,产生的水化反应产物增多,将填充至水泥石内部的孔隙空洞,增加密实度,降低氡的释放,但水泥中粉煤灰等原料会带来氡的释放;涂层表面是一种连续致密均匀的结构,孔隙率极低,防氡基元材料紧密堆积,形成了层层叠加的致密结构,对氡源起到很好的密闭作用。
Radon shielding rate as the main evaluation index to study the amount of cement added to the cinder / fly ash bricks radon release; use of self-made radon coating study of coating thickness on the cinder / fly ash brick radon release. The results show that with the increase of cement content, the radon concentration of different cement modules increases obviously. When the cement content is 35%, the radon concentration of the module reaches the maximum value, then decreases slowly. With the increase of coating thickness , The anti-radon efficiency rises. When the coating thickness is 2.0 mm, the anti-radon efficiency is 98.96%. Mechanism studies show that: the amount of cement increased, resulting in increased hydration reaction products will be filled into the pores of cement inside the pores to increase the density and reduce the release of radon, but the cement raw materials such as fly ash will bring radon release; The surface of the coating is a continuous dense uniform structure with extremely low porosity. Radon-resistant elemental materials are closely packed to form a dense layer structure, which plays a very good confinement role for the radon source.