| Issue |
MATEC Web Conf.
Volume 199, 2018
International Conference on Concrete Repair, Rehabilitation and Retrofitting (ICCRRR 2018)
|
|
|---|---|---|
| Article Number | 06008 | |
| Number of page(s) | 7 | |
| Section | Condition Assessment and NDT | |
| DOI | https://doi.org/10.1051/matecconf/201819906008 | |
| Published online | 31 October 2018 | |
Corrosion on prestressing wires due to segregation of the injection mortar – Detection of injection defects with Ultrasonic-Echo Technique
1
Engineering firm Schiessl Gehlen Sodeikat GmbH (SGS), 80687 Munich, Germany
2
University Kassel, 34199 Kassel, Germany
3
Engineering firm Schiessl Gehlen Sodeikat GmbH (SGS), 80687 Munich, Germany
* Corresponding author: sodeikat@ib-schiessl.de
Unsuitable granulometry of injection mortar can promote segregation if high hydrostatic pressure impacts on the mortar for longer time during hardening. Endangered for segregation are long perpendicular prestressing tendons e.g. used in high towers due to the high hydrostatic pressure inside. The segregation causes an accumulation of water and solved ions on top of the tendons. In this area an extremely high pH-value and a very low electrochemical potential occurs. This environment is extremely corrosive and can cause wire breaks within only few months. With the Ultrasonic-Echo Technique (Flaw Detectors) it is possible to detect injection defects by using the phase shift technique.
© The Authors, published by EDP Sciences, 2018
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