کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4913215 | 1428763 | 2017 | 15 صفحه PDF | دانلود رایگان |
- Monitoring of free Clâ content in concrete by embedded Clâ selective sensors.
- The Clâ content in various concrete types followed the Fick's second law.
- The relationships between free Clâ and bound as well as total Clâ contents were investigated.
- Lower total and larger locked porosities were found out for modified concrete.
In this paper the development of free Clâ content in various types of concrete was monitored by means of the embedded Ag/AgCl electrode. Moreover, the bound as well as total Clâ contents were determined through volumetric method. Besides, these mechanisms about the Clâ diffusion in different types of concrete are analyzed and discussed. Results revealed that real-time monitoring of free Clâ concentration in concrete was achieved based on the measurements of potentials of embedded electrodes and the diffusion law of free Clâ content followed Fick's second law. In addition, the Freundlich isotherm was recommended to describe these relationships between free Clâ content and bound as well as total Clâ concentrations. As for the types of concrete with the addition of mineral admixture, lower total porosity and larger locked porosity have been found out. However, much more efforts should be paid to develop low-cost, robustness and long-term reliable Clâ selective sensors in order to achieve the wide application in concrete environment.
Journal: Construction and Building Materials - Volume 143, 15 July 2017, Pages 1-15