摘要
在安全壳运行过程中,盛放硼酸溶液的冷却水池和水箱偶尔会发生渗漏,导致周围的混凝土结构遭到腐蚀。因此,评价硼酸环境中混凝土的劈拉强度和使用寿命具有重要意义。通过试验表征硼酸溶液对混凝土的腐蚀行为,并定性分析温度和硼酸浓度对混凝土表观特征和微观结构的影响。测定混凝土在2种温度下、浸泡于3种不同浓度硼酸溶液中时,其腐蚀深度和劈拉强度随浸泡时间的变化规律。基于该试验结果,讨论温度与硼酸浓度对混凝土腐蚀深度及劈拉强度的影响,并建立腐蚀深度和劈拉强度损失率的拟合公式。硼酸环境中混凝土结构的使用寿命预测分析结果表明:温度和硼酸浓度对混凝土结构的使用寿命均有较大影响。研究成果为混凝土安全壳评估提供了理论参考。
In the operation of containment vessels,boric acid solution often leaks out of cooling pools and water tanks and corrodes the surrounding concrete structures.Therefore,it is of important significance to evaluate the splitting tensile strength and service life of concrete in boric acid environments.The corrosion behavior of concrete caused by boric acid solution is characterized through experiment and the effects of temperature and concentration of boric acid on the appearance and microstructure of concrete are analyzed in a qualitative manner.The variations of the corrosion depth and splitting tensile strength of concrete immersed in three concentrations of boric acid under two temperatures with the immersion time are measured.Based on the experimental results,the effects of temperature and concentration of boric acid on the corrosion depth and splitting tensile strength of concrete are discussed and the regression formulae of the corrosion depth and the loss rate of splitting tensile strength are derived.Finally,the prediction of service life of concrete structures in boric acid environments is discussed.The computational results show that the service life of concrete structures is greatly influenced by temperature and concentration of boric acid,which provides a reference for the assessment of concrete containment vessels.
作者
郑建军
邵海鑫
荣华
周欣竹
ZHENG Jianjun;SHAO Haixin;RONG Hua;ZHOU Xinzhu(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Inspection and Certification Co.,Ltd.,MCC,Beijing 100088,China)
出处
《浙江工业大学学报》
北大核心
2026年第2期160-166,共7页
Journal of Zhejiang University of Technology
基金
国家优秀青年科学基金资助项目(52222808)
国家自然科学基金资助项目(52178255,52278279)。
关键词
安全壳混凝土
硼酸浓度
环境温度
劈拉强度
腐蚀深度
containment vessel concrete
concentration of boric acid
environmental temperature
splitting tensile strength
corrosion depth
