Nanomechanical testing of gamma-irradiated building composites

Procedia Structural Integrity Pub Date : 2025-01-01 DOI:10.1016/j.prostr.2025.06.003

Jiří Němeček , Jan Procházka , Martin Keppert , Patricie Halodová , Jitka Němečková , Jiří Němeček

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Abstract

Nuclear power plants worldwide are aging and will soon reach the end of their designated lifetimes. Consequently, extending their safe operation to 80 years has become the focus of extensive research. The effects of irradiation on concrete are multiscale but have primarily been studied using macroscopic samples, where a decrease in mechanical properties has been reported. This study focuses on the micro-scale effects of gamma irradiation on cement paste exposed to a wide range of relative humidities (0%–100%). Nanoindentation was employed as the main tool to quantify micro-mechanical parameters, such as Young’s modulus and hardness. A significant increase in Young’s modulus ( 25%) was found at relative humidities below 11%, attributed to the combined effects of water radiolysis and drying. In contrast, a decrease in Young’s modulus ( 26%) was observed in samples irradiated in water. Samples irradiated at medium humidities (33%–76%) showed negligible damage due to the irradiation.

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γ辐照建筑复合材料的纳米力学测试

全世界的核电站都在老化，很快就会达到其指定的使用寿命。因此，将其安全使用寿命延长至80年已成为广泛研究的焦点。辐照对混凝土的影响是多尺度的，但主要是使用宏观样品进行研究，其中力学性能下降已被报道。本研究的重点是伽马辐射对暴露在大范围相对湿度（0%-100%）下的水泥浆的微尺度效应。采用纳米压痕作为量化杨氏模量和硬度等微观力学参数的主要工具。在相对湿度低于11%时，杨氏模量显著增加（25%），这是由于水辐射分解和干燥的共同作用。相比之下，在水中辐照的样品中观察到杨氏模量下降（26%）。在中等湿度（33%-76%）下辐照的样品由于辐照造成的损伤可以忽略不计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Procedia Structural Integrity

CiteScore

1.70

自引率

0.00%

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