Civil Engineering Reference
In-Depth Information
3.3.1 Check list
The following framework may be helpful as a check list for those involved in
assessment, inspection and repair of deteriorating structures.
1 Check as-built drawings and maintenance records.
2 Carry out a structural review to identify the key areas of structural
weakness and/or structural sensitivity to deterioration as a basis for
inspection procedures. This should cover both strength and risks from
spalling.
3 Check for any features:
• for which factors of safety may be inadequate for actual construction
method and quality
• where the structural form is not explicitly covered by Codes which
may be vulnerable to progressive collapse.
4 Establish by inspection and testing:
• any departures from as-built drawings
• any indications of defective or substandard construction
• indications of severe local environments from ponding,
waterproofing breakdown, seepage etc.
• the current trends of deterioration and likely long-term trends.
5 Identify where and when protection, strengthening and/or repair
may become appropriate and cost effective as part of the long-term
maintenance programme.
6
Ensure that before repairs are carried out there is:
•
a full specification and procedure for repair, propping and testing
•
a Structural Engineer's check of the structure:
• 'as built'
• 'as deteriorated'
• 'as cut out for repair, with propping if required'
• 'as repaired'
•
'with repair delaminated'.
•
The cost implications of maintenance and further repairs, estimated
from deterioration trends over the next 20 years, have been
considered.
7
Insist on a full recorded survey of condition before problems are hidden
below patch repairs, coatings or waterproofing.
References
BRE Digest 'Corrosion of steel in concrete' (3-part set) (DG444) in BRE 'Concrete
Pack' 2007.
BS EN 1504-9:2008 'European Standard on Concrete Repair. General principles for
use of products and systems'. BSI, London, 2008.
Canisius, T.D.G. et al.,
Concrete Repair Patches Under Propped and Un-Propped
Conditions
FBE Report 3, BRE, March 2002.
