摘要
针对核电站硼酸渗漏引起的混凝土劣化问题,开展混凝土硼酸腐蚀加速试验。试验设计了不同水胶比、温度环境和硼酸浓度,每30 d测定混凝土劈裂抗拉强度,连续监测1年。基于试验结果,分析了水胶比、温度、硼酸浓度和腐蚀时间对混凝土劈裂抗拉强度的影响。结果表明:在硼酸侵蚀初期,混凝土劈裂抗拉强度的发展快于未侵蚀混凝土,并且随着硼酸溶液浓度的升高而加快发展;在长期硼酸侵蚀下,混凝土劈裂抗拉强度损失率会随时间不断增加,并且会随着硼酸溶液浓度的增加、温度的升高和水胶比的减小而加剧。基于试验结果,从微观力学的角度对硼酸引起的混凝土劣化进行了分析,可为核电站老化管理工作提供决策依据。
An accelerated experimental study was conducted to investigate the degradation of concrete material induced by boric acid.In the test,different water/bind ratios,temperature environments,and boric acid concentrations were considered,and the splitting tensile strength of concrete was measured every 30 days.Based on the test results,the effects of water/binder ratio,temperature,boric acid concentration and corrosion time on the splitting tensile strength of concrete were analyzed.The results show that in the initial stage of boric acid erosion,the development of splitting tensile strength of concrete is faster than that of original concrete,and will accelerate with the increase of the concentration of boric acid solution;for concrete under long-term erosion of boric acid,the loss rate of splitting tensile strength of concrete will increase with time,concentration of boric acid solution,and the temperature.The decrease of water cement ratio will promote the increase of loss rate as well.Based on the experimental results,the mechanisms behind boric acid-induced degradation of concrete material were analyzed,which has implications for the aging management of nuclear power plants.
作者
蒋达飞
王建乐
荣华
赵国栋
李玉兵
冯子龙
张璇
JIANG Dafei;WANG Jianle;RONG Hua;ZHAO Guodong;LI Yubing;FENG Zilong;ZHANG Xuan(CNNC Nuclear Power Operation Management Co.,Ltd.,Jiaxing 314300,China;Inspection and Certification Co.,Ltd.,MCC,Beijing 100088,China)
出处
《混凝土》
北大核心
2025年第11期31-34,45,共5页
Concrete
基金
中核核电运行管理有限公司科研项目(Y-2021-0141)
国家自然科学基金优秀青年科学基金(52222808)
国家自然科学基金面上项目(52078509,52178255,52278279)。
关键词
混凝土
水胶比
温度
硼酸
劈裂抗拉强度
concrete
water/binder ratio
temperature
boric acid
splitting tensile strength
