快中子诱发蛇纹石混凝土力学性能退化研究  

DEGRADATION OF MECHANICAL PROPERTIES OF CONCRETE WITH SERPENTINE AGGREGATES SUBJECTED TO FAST NEUTRON RADIATION

作　　者：陈凤娟 高成琛 金浏[1] 杜修力[1] CHEN Feng-juan;GAO Cheng-chen;JIN Liu;DU Xiu-li(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市减灾与防灾防护教育部重点实验室,北京100124

出　　处：《工程力学》2025年第1期32-43,共12页Engineering Mechanics

基　　金：国家自然科学基金项目(51978022);北京市自然科学基金杰出青年基金项目(JQ22025)。

摘　　要：基于三维细观数值模拟方法,考虑快中子辐照(MeV>1.0)诱发的温度与骨料膨胀联合作用对混凝土力学行为及破坏形态的影响规律,该文提出了可有效预测辐照混凝土残余力学性能的二阶段数值模型计算方法,开展了蛇纹石骨料混凝土力学性能退化研究,并借助物理试验进行了模型验证。此外,基于数值模拟结果,提出了蛇纹石骨料膨胀作用下混凝土力学响应及残余力学性能的理论计算公式。该文提出的三维细观数值模型旨在为评估辐照混凝土力学响应及残余力学性能提供有效工具,为揭示辐照混凝土力学性能退化机理提供分析工具,为进行辐照混凝土基准研究提供理论依据,后期可为核反应堆混凝土防护墙延寿评估提供一定的理论指导。The deterioration mechanism of concrete materials with expanding serpentine aggregates subjected to fast neutron radiation(MeV>1.0)was investigated by numerical simulation.Considering the combined effects of temperature and aggregate radiation-induced volumetric expansion(RIVE)on the mechanical behavior and the residual elasticity of concrete,a two-stage numerical model was established at the mesoscopic scale.The residual elasticity of concrete was investigated numerically and validated by comparing with experimental data.Based on the numerical results,the analytical formulas of concrete swelling and the residual elasticities were proposed.The 3D numerical approach can provide an effective tool for assessing the combined effect of temperature and RIVE in the aggregates on the mechanical behavior and the residual elasticity of concrete with application to fast neutron radiation,and for revealing the deterioration mechanism of concrete materials with expanding aggregates.The proposed model serves as a first attempt and provides a theoretical benchmark and can be potentially applied for the life extension evaluation of aging concrete materials.

关 键 词：快中子 辐照诱导骨料膨胀 力学性能 三维细观数值模型 蛇纹石骨料混凝土 

分 类 号：TU528.19[建筑科学—建筑技术科学]