水泥基材料离子迁移过程的可视化与定量分析

Visualization and quantitative research of ion migration process in cement-based materials

氯离子的侵蚀是引起滨海混凝土钢筋锈蚀的关键因素之一.为探索离子在水泥基材料中的原位迁移过程,利用X射线计算机断层扫描(X-ray computed tomography,XCT)技术,以碘化物为示踪剂,对掺有粉煤灰的水泥基材料的离子迁移过程进行无损分析.结果表明,XCT技术可以对离子在水泥基材料中的迁移过程进行无损、可视化跟踪,并能精确定量离子在样品内的浓度分布.将XCT与滴定法分别测得的离子浓度进行对比,证明了XCT测试结果的准确性.

The erosion of chloride ions is one of the key factors of concrete reinforcement corrosion in coastal area.In order to explore the in-situ migration process of ions in cement-based materials,the X-ray computed tomography(XCT)is used to analyze the migration process using iodide as tracer in cement-based materials mixed with fly ash.The results show that XCT technology can track the ion migration process in cement-based materials non-destructively and visually,and accurately quantify the concentration distribution of ions in the specimens.And the accuracy of XCT test results is proved by comparing the ion concentration measured by XCT and titration method.