Estimation of chloride ion contents in concrete by the radar method | |
| Author | Mistee, Laziza Amin |
| Call Number | AIT Thesis no.ST-06-11 |
| Subject(s) | Concrete Mixing Chlorides |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-06-11 |
| Abstract | The structural performance and the lifetime of the concrete structures are significantly degraded due to the corrosion of reinforcing steels subjected to chloride attack. Therefore, the estimation of chloride content in the concrete is quite important. Current method of chloride estimation by core sampling is slow, labor intensive and a destructive one. Radar method has a good potential in estimating chloride content due to its rapid non-destructive procedures. Radar method is not used previously for estimating chloride content in concrete. The relationship of the dielectric properties of concrete to its physical properties can be an effective mean for the chloride content estimation. Recently, cement in concrete is partially replaced by the mineral admixture, like fly ash, to improve the structural performance. Therefore the relationship among electromagnetic wave amplitude, chloride content, cover depth and fly ash content is investigated in this study. From the experimental results, it is observed that the amplitude of electromagnetic wave decreases with the increasing chloride content as well as cover depth. The change in fly ash content does not exhibit clear effect on the amplitude of electromagnetic wave. Therefore further research will be required to investigate the effect of fly ash content on the amplitude. In this research, the significant relationship of amplitude, chloride content and cover depth is developed and is proposed for estimating chloride concentration in concrete within some specified limit. However, other than chloride content and cover depth, other factors such as moisture content, pore-size distribution, temperature and frequency of wave may also have significant effect on the dielectric properties of electromagnetic wave. Therefore to estimate the chloride content accurately for real structures the other parameters should also be investigated in further research |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-06-11 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Kato, Yoshitaka; |
| Examination Committee(s) | Worsak Kanok-Nukulchai;Pennung Warnitchai; |
| Scholarship Donor(s) | AIT Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |