| Author | Direk Kruaysiriwong |
| Call Number | AIT Thesis no.ST-07-05 |
| Subject(s) | Non-destructive testing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-07-05 |
| Abstract | Radar method, one of the powerful non destructive tests (NDT), is usually used to detect rebar positions and discontinuities in concrete. The radar method has many benefits such as rapid, no damage and no coupling medium required but in the other hand, it also has some limitations namely accuracy in detecting rebar depth and has no ability to detect rebar size. In order to detect rebar depth accurately, the close estimation of dielectric constant of concrete is necessary. The concrete consists of cement paste which has changeable dielectric property and aggregate of which dielectric property is almost constant. Thus, the key point is how to predict dielectric constant of concrete accurately. Before that, the effect of some factors are investigated namely W/C ratio, NaCl content, fly ash, total aggregate volume and fine/total aggregate ratio (s/a ratio). The experimental is conducted to obtain the required information. After the results are obtained, the estimation formula for dielectric property of cement paste is derived base on experimental result. The formula shows a good potential in predicting of dielectric constant of cement paste with known mix proportion. The generation of this predicting equation is only the first step in estimating the dielectric property of concrete. The detection of rebar size is the secondary topic in this study. The main idea is the reflected wave from each rebar size in several directions of measurement can show some index to detect rebar size. Only the reflected amplitude is interested. The experimental results are analyzed in many ways and finally the interested index is found. For example, the index shows the different value for each size of rebar. Although the lack of information is one of problems of this study, the research will lead the tendency for further study. This research shows a good trend in estimating dielectric constant of concrete and detecting rebar size. Supported by this study, the final purpose can be achieved in the future. However, more tests and information are required. |
| Year | 2007 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-07-05 |
| 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;Raktipong Sahamitmongkol; |
| Scholarship Donor(s) | RTG Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2007 |