1. Standards, Best Practice Guidances and Thresholds
CONREPNET Workshop MW6
BRE, 24th April 2006
Standards, Best Practice Guidances and Thresholds
Josse Jacobs
Technological advisor
BBRI
CONREPNET, MW6 Workshop

2. EN 1504 Standards : 10 Parts 1 Definitions
2 Surface protection systems for concrete
3 Structural and non structural repair (soon)
4 Structural bonding
5 Concrete injection
6 Anchoring of reinforcing steel bar (project)
7 reinforcement corrosion protection (project)
8 Quality control and evaluation of conformity
9 General principles for the use of products and systems
10 Site application and quality control of the works
CONREPNET, MW6 Workshop

3. Other EN Standards CEN/TS 14038-1 Realkalization
prCEN/TS Chloride extraction (project ?)
EN Cathodic protection of steel in concrete
??? Sprayed concrete for repair (project ?)
CONREPNET, MW6 Workshop

4. Repair procedure according to 1504-9
Standard does not cover
repair of concrete structures damage caused by fire
repair defects of existing post-tensioned systems
Requirements before repair
Safety before, during and after works
Assessment of defects and causes
CONREPNET, MW6 Workshop

5. Defects and their causes
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6. Objectives and options
Do nothing <==> demolition
Factors to consider (general, health, structural, environmental)
Choice of action
Extent and cause of defects
Future conditions
Appropriate to chosen protection or repair option
Principles
Possible using EN 1504 or other standards
CONREPNET, MW6 Workshop

7. Methods based on the principle
1 Protection against ingress (PI)
1.1
Impregnation
1.2
Surface coating with and without crack bridging ability
1.3
Locally bandaged cracks
1.4
Filling cracks
1.5
Transferring cracks into joints
1.6
Erecting external panels
1.7
Applying membranes
2 Moisture Control (MC )
2.1
Hydrophobic impregnation
2.2
Surface coating
2.3
Sheltering or over cladding
2.4
Electrochemical treatment
3 Concrete Restoration (CR)
3.1
Applying mortar by hand
3.2
Recasting with concrete
3.3
Spraying concrete or mortar
3.4
Replacing elements
4 Structural Strengthening (SS)
4.1
Adding or replacing embedded or external reinforcing steel bars
4.2
Installing bonded rebars in preformed or drilled holes in the concrete
4.3
Plate bonding
4.4
Adding mortar or concrete
4.5
Injecting cracks, voids or interstices
4.6
Filling cracks, voids or interstices
4.7
Prestressing - (post tensioning)
5 Physical Resistance (PR)
5.1
Overlays or coatings
5.2
6 Resistance to chemicals (RC)
6.1
6.2
CONREPNET, MW6 Workshop

8. Methods based on the principle
Principles (reinforcement)
Other solutions not excluded
Principle
Methods based on the principle
7 Preserving or restoring passivity (RP)
7.1
Increasing cover to reinforcement with additional cementitious mortar or concrete
7.2
Replacing contaminated or carbonated concrete
7.3
Electrochemical realkalisation of carbonated concrete
7.4
Realkalisation of carbonated concrete by diffusion
7.5
Electrochemical chloride extraction
8 Increasing Resistivity (IR)
8.1
Limiting moisture content by surface treatments, coatings or sheltering
9 Cathodic Control (CC)
9.1
Limiting oxygen content (at the cathode) by saturation or surface coating
10 Cathodic Protection (CP)
10.1
Applying electrical potential
11 Control of Anodic Areas (CA)
11.1
Painting reinforcement with coatings containing active pigments
11.2
Painting reinforcement with barrier coatings
11.3
Applying inhibitors to the concrete
Note: Some of the methods may make use of products and systems that are outside the scope of the EN1504 series.
CONREPNET, MW6 Workshop

9. After repair Record of repair works
Instructions on inspection and maintenance to be undertaken during the remaining design life of the repaired part of the concrete structure
CONREPNET, MW6 Workshop

10. Selection overview Not all methods covered by standards 2006 04 24
CONREPNET, MW6 Workshop

11. Performance characteristics (EN1504-2)
Many tests,
Criteria/test in function of Principle and method
Several test related to durability of material and to protection of substrate (permeability, frost).
CONREPNET, MW6 Workshop

12. Performance characteristics (prEN1504-3)
Material characteristics
Compressive strength, Chloride content, adhesive bond, Shrinkage/expansion
Durability of the material
Carbonation resistance, thermal compatibility
Other
Elastic modulus, skid resistance, thermal expansion, Capillary absorption
Chloride ion ingress : only for special applications
CONREPNET, MW6 Workshop

13. Performance characteristics (EN 1504-4)
Tests on suitability for application, adhesion, material charcateristics
Durability of the product:
Thermal cycling
Moisture cycling
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14. Performance characteristics (1504-5)
3 purposes for injection
Durability characteristics
Adhesion after thermal and wet-drying cycles, compatibility with concrete, sensitivity to water (expansion)
CONREPNET, MW6 Workshop

15. Other repair materials
Anchoring (EN )
Corrosion (1504-7)
Under development
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16. Conclusions BUT Repair can be designed (1504-9)
Materials can be evaluated (1504-8)
Repair can be evaluated ( )
PBI are possible
BUT
No reflections on repaired structures
What about performances after aging
What about behaviour of the repaired structure
CONREPNET, MW6 Workshop