摘要
将氧化铋以粉末形式添加到普通混凝土中,制备出绿色无污染且具有良好的?射线屏蔽性能的掺杂氧化铋的混凝土。相较于普通混凝土,氧化铋-混凝土的屏蔽性能及力学性能均得到改善。对比屏蔽性能实验结果及MCNP5(Monte Carlo N-Particle 5)模拟结果,二者相符很好,可以用MCNP5进行后期配合比设计优化。运用田口方法对水泥量、水胶比、氧化铋比例及砂率等进行优化设计。结果表明,对氧化铋-混凝土屏蔽能力影响最大的参数是氧化铋的加入量,其次为水泥量,水胶比及砂率的影响可忽略。
Background: To enhance the shielding properties of concrete mixtures, there is a tendency toward using various additives while most of these additives being used either pose hygiene hazards or require special handling processes. Purpose: To ensure the concretes being environmentally friendly and providing sufficient gamma ray radiation shielding efficiency, Bi_2O_3-loaded concrete mixtures are researched and optimized. Methods: Both experimental and theoretical methods were used to calculate the linear attenuation coefficient before using the Taguchi method to optimize concrete's mix proportion which includes cement quantity, water-to-cementitious material ratio, Bi2O3 rate and sand ratio. Results: The shielding abilities and mechanical properties of Bi_2O_3-loaded concretes were improved compared with ordinary concrete. There was small inconsistency between results obtained by MCNP5(Monte Carlo N-Particle 5) program and experiment. Conclusion: It was suggested in the study that the most important parameter affecting the attenuation of the concrete's radiation is the Bi_2O_3 rate while cement quantity is the following factors, and the effects of water-to-cementitious material ratio and sand ratio are negligible.
引文
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