Surface protection systems

The term surface protection system covers a range of different types and designs. Besides polymer-containing coatings for concrete structures, organosilicon compounds can also be used as water repellents in surface protection systems.

Surface protection systems for concrete structures serve to protect concrete and reinforced concrete structures. The goals are:

  • to inhibit or prevent the penetration of corrosion-inducing substances that attack concrete (e.g. soft / low-ion water, other liquids, steam, gas, chemicals) or to inhibit or prevent attack by microorganisms,
  • to regulate the water content by adjusting and maintaining the concrete moisture within a non-critical range, and
  • to increase the resistance of concrete to chemicals and mechanical attack.

Surface protection systems are also used to repair or provide protection against reinforcement corrosion, in particular, to maintain or restore passivity and increase electrical resistance.

In accordance with the 'Additional technical terms of contract and guidelines for engineering structures' (Zusätzliche Technische Vertragsbedingungen und Richtlinien für Ingenieurbauten, ZTV-ING) or the 'Additional technical terms of contract for the repair of concrete structures in hydraulic engineering' (Zusätzliche Technische Vertragsbedingungen für die Instandsetzung der Betonbauteile von Wasserbauwerken, ZTV-W LB 219), a distinction is made between the following surface protection systems:

  • OS 1 (OS A): Hydrophobic treatment
    • OS 1 (OS A) is applied to reduce water absorption in vertical and inclined concrete structures that are exposed to weathering, e.g. retaining walls. OS 1 (OS A) is not effective with pressurised water.
  • OS 2 (OS B): Coating for surfaces not accessible by foot or vehicle (without scratch coating or levelling filler)
    • OS 2 (OS B) is applied to increase the carbonation resistance of sufficiently drained concrete structures exposed to weathering, conditionally also in the spray zone of de-icing agents.
  • OS 4 (OS C): Coating with increased impermeability for surfaces not accessible by foot or vehicle (with scratch coating or levelling filler)
    • OS 4 (OS C) is applied to concrete structures directly exposed to weathering, also in the spray zone (with corresponding verification also in the splash zone) of de-icing agents.
  • OS 5a (OS DII) / OS 5b (OS DI): Coating with low crack-bridging capacity for surfaces not accessible by foot or vehicle (with scratch coating or levelling filler)
    • OS 5a (OS DII) / OS 5b (OS DI) is applied to concrete structures exposed to weathering and with cracks close to the surface (with corresponding verification also for structures with separating cracks). The systems may also be used in the spray zones (with corresponding verification also in the splash zone) of de-icing agents.
  • OS 11a (OS F a) / OS 11b (OS F b): Coating with increased dynamic crack-bridging capacity for surfaces accessible by foot or vehicle
    • OS 11a (OS F a) / OS 11b (OS F b) is applied to concrete structures exposed to weathering and with cracks close to the surface and/or separating cracks subject to mechanical stress, also in the spray zone or splash zone of de-icing agents, e.g. bridge caps.

Regulatory framework

DIBt prepares evaluations of the fitness for use of surface protection systems in the area of transport infrastructure construction. The evaluations provide independent validation of additional information that cannot be stated in the declaration of performance.

It would also be possible to issue an ETA instead of an evaluation, however, there are no European Assessment Documents (EADs) for surface protection systems as yet.

In accordance with the ZTV-ING and ZTV-W LB 219, the evaluations serve as 'verifiable confirmation' (prüffähige Bescheinigung) and are recognised as equivalent to project-specific verifications when they fully correspond to the construction specifications. The Notes on ZTV-ING (Hinweise zu den ZTV-ING) – Part 3 – Section 4 and the BAWRecommendation 'Repair products – Notes for the expert designer on works-related product characteristics and test methods' (BAWEmpfehlung "Instandsetzungsprodukte – Hinweise für den Sachkundigen Planer zu bauwerksbezogenen Produktmerkmalen und Prüfverfahren") are to be observed to support the construction specifications and the execution of construction work.

Technical rules

 

ZTV-ING – Part 3 – Section 4
Federal Ministry of Transport and Digital Infrastructure, Federal Highways Division (ed.):
Zusätzliche Technische Vertragsbedingungen und Richtlinien für Ingenieurbauten – Teil 3 Massivbau – Abschnitt 4 Schutz und Instandsetzung von Betonbauteilen, October 2017

Notes on ZTV-ING – Part 3 – Section 4
Federal Ministry of Transport and Digital Infrastructure, Federal Highways Division (ed.):
Hinweise zu den ZTV-ING – Teil 3 Massivbau – Abschnitt 4 Schutz und Instandsetzung von Betonbauteilen, April 2019

ZTV-W LB 219
Federal Ministry of Transport and Digital Infrastructure, Department of Waterways, Shipping (ed.):
Zusätzliche Technische Vertragsbedingungen – Wasserbau – für die Instandsetzung der Betonbauteile von Wasserbauwerken (Leistungsbereich 219), June 2017

BAWRecommendation 'Repair products'
Federal Waterways Engineering and Research Institute (BAW) (ed.):
BAWEmpfehlung "Instandsetzungsprodukte – Hinweise für den Sachkundigen Planer zu bauwerksbezogenen Produktmerkmalen und Prüfverfahren", May 2019

Instandhaltung von Betonbauwerken (TR Instandhaltung): Teil 1 – Anwendungsbereich und Planung der Instandhaltung (86 pages)

Stand: Mai 2020

Instandhaltung von Betonbauwerken (TR Instandhaltung): Teil 2 – Merkmale von Produkten oder Systemen für die Instandsetzung und Regelungen für deren Verwendung (72 pages)

Stand: Mai 2020

Application forms

European Technical Assessment (ETA)

To start the ETA procedure, please submit the form below. We will then check if the prerequisites for issuing an ETA are met, i.e., in particular, if the product is not fully covered by an existing harmonised standard. If the prerequisites are met, we will check whether a European Assessment Document (EAD) covering the requested assessment scope already exists or still needs to be developed. If an EAD needs to be developed or amended, a complete technical file needs to be established before the procedure can begin.

Form for requesting a European Technical Assessment (ETA) (2 pages)

Last updated: 16 June 2022

Voluntary evaluations of fitness for use

Where the relevant harmonised standard is incomplete, economic actors can provide product performance information on a voluntary basis. DIBt offers independent validation and confirmation of such additional performance information in the form of a voluntary evaluation of fitness for use.

Auftrag zur Erstellung eines Gutachtens (4 pages)

über die Einhaltung bauaufsichtlicher Anforderungen an bauliche Anlagen bei Einbau des bezeichneten Bauprodukts

  • DIBt evaluation
  • The evaluations listed below are published with the kind consent of the evaluation holder. Evaluations which have not been released for publication are not made available by DIBt.
    Subject Prepared for Number Issued on
    Oberflächenschutzsystem OS B (OS 2) "AM Surface Tunnel"

    AM Surface AG

    Spissenstraße 72

    6045 Meggen

    SCHWEIZ

    G-003-10-0001 29.06.2020

Dr Wilhelm Hintzen
Head of Section – Concrete Technology

Phone +49 30 78730-328
Email whi(at)dibt(.)de

Legal reference documents