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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Effects of Irradiation on Albite's Chemical Durability
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Effects of Irradiation on Albite's Chemical Durability

机译：辐照对阿尔摩化学耐用性的影响

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摘要

Albite (NaAlSi3O8), a framework silicate of the plagioclase feldspar family and a common constituent of felsic rocks, is often present in the siliceous mineral aggregates that compose concrete. When exposed to radiation (e.g., in the form of neutrons) in nuclear power plants, the crystal structure of albite can undergo significant alterations. These alterations may degrade its chemical durability. Indeed, careful examinations of Ar+-implanted albite carried out using Fourier transform infrared spectroscopy (FTIR) and molecular dynamics simulations show that albite's crystal structure, upon irradiation, undergoes progressive disordering, resulting in an expansion in its molar volume (i.e., a reduction of density) and a reduction in the connectivity of its atomic network. This loss of network connectivity (i.e., rigidity) results in an enhancement of the aqueous dissolution rate of albite measured using vertical scanning interferometry (VSI) in alkaline environments by a factor of 20. This enhancement in the dissolution rate (i.e., reduction in chemical durability) of albite following irradiation has significant impacts on the durability of felsic rocks and of concrete containing them upon their exposure to radiation in nuclear power plant (NPP) environments.
机译：Albite（Naalsi3O8），普形菌酶长石氏菌族的框架硅酸盐和肠岩的常见组成，通常存在于构成混凝土的硅质矿物骨料中。当核发生厂中暴露于辐射（例如，以中子形式）时，Albite的晶体结构可以经历显着的改变。这些改变可能降低其化学耐用性。实际上，使用傅里叶变换红外光谱（FTIR）和分子动力学模拟进行的AR + -implanted Albite的仔细检查表明，抗体在辐射后进行渐进式失调，导致其摩尔体积（即减少密度）和原子网络连接的降低。这种网络连接（即，刚性）的损失导致使用碱性环境中的垂直扫描干扰测量（VSI）测量的ALBITE的含水溶解速率增加了20倍。这种增强溶出速率（即，化学的减少耐久性）Albite之后的照射对肠岩和混凝土的耐久性产生了重大影响，并在核电站（NPP）环境暴露于辐射后。

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