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Condition Assessment - Procedures
- Read Reports & discuss with Client
- Get background information
- Identify requirements for initial site visit
- Initial Site Visit
- Visual Inspection
- Photographs and sketches
- Identify areas of interest and additional data required
- Identify test locations and equipment /personnel required
- Issue report (if required)
- Detailed Site Inspections (if required)
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Site investigation - Preparation
- - reason for assessment
- Testing
- - Initial inspection (Visual/Delamination survey: Tape measure, steel ruler, crack gauge, brush/scraper, hammer, chisel. Camera, batteries, binoculars, torch. Other rudimentary accoutrements to make
- records)
- - Detailed inspection (Cover, half-cell,
- resistivity, corrosion rate)
- Personnel
- Access
- OH&S / PPE
- Site induction
- JSA
- Work Method Statements (based on JSA)
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Visual Inspections
- Cracks (corrosion, casting (crazing, plastic & drying shrinkage, thermal), ASR, loading (increasing, repetitive, pooor design, washout), impact).
- Cracks <0.3mm can autogenously heal but may provide access for corrosive substances.
- Rust staining
- Spalling
- Delamination (debonded but not yet spalled, hollow sounding)
- Poor workmanship (low cover, poor compaction, QA, &/or design)
- Design (durability assessment (environmental exposure & loading), materials selection
- Water leaks/damage
- Poor quality repairs
- Other damage
- Causes
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Interpreting visual data
- Single structure
- Network of structures; single owner or similar structures with many owners
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Condition Assessment System
- Collect Data
- Record Data
- Evaluate Data; rating system, algorithm, experience
- Recommendations; individual structures, network of structures
- Store Data
- Prioritisation of structures for inspection /assessment
- Categorisation of component parts;
- Break down network to individual structures,
- Piers, abutments, bridge deck, etc
- Categorisation of vulnerability of structure and it’s components
- Categorisation of extent and severity of deterioration and structural adequacy
- Rating of structure
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Level of Inspection
- Routine; set period (1-5 years), visual, installed monitoring
- Detailed; set period (5-10 years), defects from routine, standard NDT
- Specialist; defects from detailed, specialist equipment
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Rating Systems
- Routine and visual inspections
- Generally based on 4 or 5 levels
- Further testing and repair triggered when higher levels are reached
- Generally reactive rather than proactive
- Requires experienced personnel (subjective decisions)
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Rating tables
- - visual inspection
- - extent and severity
- - detailed inspection
- - structural inspection
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