Investigation on the effectiveness of the repair method 8.3 ''Corrosion protection by increasing electrical resistivity'' in chloride‐containing concrete Part 1: Overview and recognition of Prof. Raupach's contribution

Abstract

The repair method 8.3 "Corrosion protection by increasing the electrical resistance" according to EN 1504 (or the repair principle W-Cl according to the DAfStb directive "Protection and repair of concrete building materials") represents a technically and economically interesting method for the repair of chloridecontaminated concrete components. The coating applied as part of the repair principle prevents further water absorption of the concrete and, due to its permeability to water vapor, allows the concrete to dehydrate. Over time, this leads to an increase in the electrolytic resistance and thus to a reduction in the rate of corrosion. The article deals with the basic principles underlying this repair principle, deals with the current regulatory situation, and shows the responsibility of the expert planner. Groundbreaking studies on the effectiveness of the repair principle were carried out by Prof. Raupach, to whom this article is dedicated, and are summarized in this paper. The objective of the new studies, which build on the aforementioned research, is to establish universally accepted application limits, for example, the level of the remaining chloride concentration, for the low-risk use of this repair method.chloride, corrosion, durability, reinforced concrete, repair method 1 | W-Cl: A VERY PROMISING REPAIR PRINCIPLE One of the reasons why the material combination of reinforced concrete has been extremely successful for over a century is that concrete, due to its high pH value, protects reinforcing steel from corrosion. As a result, reinforced concrete does not require additional corrosion protection for normally exposed structures. However, chlorides from deicing salts and seawater, This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

[Retracted] An Investigation on the Effectiveness of Creating a Music Classroom Teaching Environment Based on Psychological Expectations

“…With the continuous development of information technology, although new technical means have gradually shown certain advantages in traditional education, in most schools, traditional teaching management methods are still used to carry out music teaching, and the traditional music teaching mode is still the mainstream of today's music education, although it appears to be using new information technology means, it is actually still an old mindset [12]. With the gradual change of the traditional teaching mode, some advanced information technologies have become overkill or even useless in music teaching [13]. Due to the lack of systematic theoretical and practical guidance, the rapidly developing Internet technology has not been able to serve the new music teaching model and be used for music education [14].…”

Carbon steel electrodes within chloride induced reinforcement corrosion in cracked concrete: Approximation to deterministic system response

“…[ 27,28 ] But one can still conclude, that in the present scope of simulating the borderline case of repair effectiveness via surface coating, no specimen except one value clearly surpasses 1.0 (M.‐%/c.). Accordingly, within the present circumstances the effectiveness of the repair principle is suggested by Breit et al [ 56 ] and Wunderle et al [ 1 ] The occurrence of macrocell corrosion activity and the imaginable synergetic influence of anodic attraction onto the negatively charged chlorides cannot be confirmed. The diffusion coefficient D RCM , resulted in a value of 9.81 × 10 −12 m 2 s −1 with a standard deviation of 0.15 × 10 −12 m 2 s −1 .…”

Grenzen des Korrosionsmonitorings zum Wirksamkeitsnachweis des Instandsetzungsprinzips 8.3 (W‐Cl)

“…Dieses Prinzip wird in der Technischen Regel Instandhaltung von Betonbauwerken (TR-IH) [1] des Deutschen Instituts für Bautechnik beschrieben. Die Entwicklung der Anwendung und Anwendungsgrenzen des Instandsetzungsprinzips 8.3 (W-Cl) sowie der rechtliche Hintergrund hierzu werden von Breit, Dauberschmidt aktuell zusammengefasst [2]. Der ursprüngliche Untertitel "Beschichtung zur Erhöhung des elektrischen Widerstands" ist im Zusammenspiel mit Chloriden allerdings irreführend, da selbst in der TR-IH zu lesen ist, dass eine Austrocknung bei hohem Chloridgehalt nicht zu erwarten ist [1].…”