European standards for concrete repair - Concrete Repair - page 193

Table 11.3 Six steps in assessment, specification, repair and maintenance
Step 1:
Information
about the
structure
Cl 4

• Present condition and history of the structure
• Original design approach
• Available documentation
• Performance of previous repair and maintenance work
• Environment, loading and contamination during construction and
use
• Requirements for future use

Step 2:
Process of
assessment
Cl 4

• Assessment of defects and their causes ( Figure 11.1)
• Safety and structural appraisal in the current condition
• Cost and funding of alternative protection or repair options,
including future maintenance and access costs
• Consider the appearance of the protected or repaired structure

Step 3:
Management
strategy
Cl 5 & 6

• Undertake a safety and structural appraisal for the structure for the
cases of before, during and after protection and repair work
• Identify options for each repair case ( Table 11.4)
• Define principles for repair and protection to combat the
deterioration mechanisms, acting singly or in combination (Table
11.5)
• Select the methods for repair and strengthening (Table 11.5)
• Select the methods of protection to combat the exposure
environment

Step 4:
Design of repair
work
Cl 6, 7 & 9
EN 1504: Pt
2 - 7

• Consider the intended use of products and systems
• Consider ease of maintenance and re-repair, if required
• Assess application requirements for substrate, products and working
methods
• Prepare specifications and work drawings
• Undertake a safety and structural reappraisal after completion of the
protection and repair work

Step 5:
Repair work
Cl 6, 7, 9 & 10
EN 1504: Pt 10

• Selection and use of materials and equipment in the prevailing work
environment, including minimum performance levels
• Quality Control tests
• Health and Safety of stakeholders
• Competence of personnel, including trial repairs

Step 6
Acceptance
Cl 8
EN 1504: Pt 10

• Product sampling and identification testing
• Acceptance testing following application
• Remedial action required to the products or systems
• Future maintenance schedule
• Full works documentation

Table 11.4 Six options for tackling a deteriorated concrete structure
• Do nothing for a certain time but monitor

• Re-analyse the structural capacity, possibly leading to downgrading in function

• Prevent or reduce further deterioration

• Strengthen or repair and protect all or part of the concrete structure

• Reconstruct or replace all or part of the concrete structure

• Demolish all or part of the concrete structure