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IF 6.7 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2024-09-13 DOI:10.1016/j.jobe.2024.110705

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引用次数: 0

摘要

随着核技术在医疗和能源领域的广泛应用，对高效辐射屏蔽材料的需求与日俱增。仅使用铅或聚乙烯醇（PVA）纤维增强材料无法在提高辐射屏蔽效率和机械性能的同时改善高性能混凝土（HPC）的脆性。本研究开发了一种新型辐射衰减高性能混凝土（HPC），以磁铁矿作为骨料，并用铅-聚乙烯醇（PVA）混合纤维（RSHPC）进行加固。研究了不同比例的混合铅-PVA 纤维对力学性能、三维微观结构、孔隙结构和界面过渡区（ITZ）的协同效应。此外，还通过实验和模拟分析评估了不同混合铅-PVA 纤维比例的 RSHPC 的辐射衰减能力。结果表明，混合铅-PVA 纤维显著改善了 RSHPC 的气穴结构。PVA 纤维的加入通过改善基体的 ITZ，有效缓解了铅纤维对力学性能的负面影响。孔隙结构的细化和轻重核素的引入显著增强了 RSHPC 的伽马射线和中子辐射衰减能力。利用 X 射线计算机断层扫描（X-CT）进行三维重建进一步表明了铅-PVA 混合纤维对微观结构的优化影响，特别是在改善孔隙分布和纤维分散方面，从而提高了 RSHPC 的整体性能和辐射衰减性能。

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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Effect of hybrid lead-PVA fibers on microstructure and radiation shielding properties of high-performance concrete

With the widespread application of nuclear technology in the medical and energy fields, the demand for efficient radiation shielding materials is increasing. Employing only lead or polyvinyl alcohol (PVA) fiber reinforcement cannot achieve improvements in the brittleness of high-performance concrete (HPC) while also enhancing radiation shielding efficiency and mechanical properties. This study develops a novel HPC for radiation attenuation, incorporating magnetite as the aggregate and reinforced with hybrid lead-PVA fibers (RSHPC). The synergistic effects of various proportions of hybrid lead-PVA fibers on the mechanical properties, three-dimensional microstructure, pore structure, and interfacial transition zone (ITZ) were investigated. In addition, the radiation attenuation capacities of RSHPC with different hybrid lead-PVA fiber proportions were evaluated through experimental and simulation analysis. The results show that hybrid lead-PVA fibers notably improve the air-void structure of RSHPC. The incorporation of PVA fibers, by improving the ITZ of matrix, effectively mitigates the negative impact of lead fibers on mechanical performance. The refinement of pore structure and the introduction of light and heavy nuclides lead to a significant enhancement in the gamma-ray and neutron radiation attenuation capabilities of RSHPC. Utilizing X-ray computed tomography (X-CT) for three-dimensional reconstruction further indicates the optimization impact of hybrid lead-PVA fibers on the microstructure, notably in the improvement of pore distribution and fiber dispersion, thus enhancing the overall properties and radiation attenuation performance of RSHPC.

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来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.