摘要
有害离子通过水为媒介在水泥基材料内部传输,引起钢筋混凝土的劣化发展,缩短了混凝土结构的服役年限.为研究水泥基材料因水分传输引起的劣化机理,基于X射线断层扫描技术,采用碘化钠溶液作为图像增强剂,对水分在水泥净浆内部的传输过程进行原位和无损可视化追踪,分析水在水泥基体的吸水渗透深度变化.研究表明,当采用质量分数为10%的碘化钠溶液时,X射线断层扫描技术可清晰表征水分在净浆中的二维和三维传输过程;通过X射线断层扫描技术测定的吸水深度与时间平方根呈线性关系,符合Locas-Washburn方程.
Harmful ions transport inside the concrete by the medium of water,causing the deterioration of concrete and the steel-bar corrosion development and shortening the service life of concrete. In order to study the degradation mechanism of cement-based material due to water transportation,this study in-situ traces the water transport process in cement paste non-destructively and quantitatively analyzes the relationship between water uptake depth and absorption time by means of X-ray computed tomography microscope（X-ray μCT） combined with Na I enhancing.The results show that the 2D and 3D evolution of water transport in cement paste could be clearly characterized by X-ray μCT method with mass fraction of 10% Na I solution. What＇s more,the absorption depth measured by X-rayμCT is linear with the square root of time,which is consistent with Locas-Washburn equation.
作者
董必钦
郭邦文
刘昱清
姚婉琼
洪舒贤
邢锋
DONG Biqin;GUO Bangwen;LIU Yuqing;YAO Wanqiong;HONG Shuxian;and XING Feng(College of Civil Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P. R. China)
出处
《深圳大学学报（理工版）》
EI
CAS
CSCD
北大核心
2018年第3期285-291,共7页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(51538007,51478270,51378239)
