- 2070 Bhadra · 3 marks
Short note: Diagnostic maintenance
Short answer
Diagnostic maintenance examines actual condition by visual inspection, testing, and monitoring to find defects, causes, and needed repairs. It uses methods like rebound hammer, ultrasonic pulse, core tests, and corrosion tests, allowing repair only when needed. It requires skilled staff and equipment but improves safety and treats causes rather than symptoms.
Write a short note on diagnostic maintenance.
Diagnostic maintenance (closely related to condition-based or predictive maintenance) is a maintenance approach in which the actual condition of a structure or equipment is examined by inspection, testing and monitoring to find the defects, their causes and extent, and to decide what repair is needed and when.
Steps
- Visual inspection and recording of defects (cracks, leakage, corrosion, spalling).
- Collect the history: design, age, use and earlier repairs.
- Testing: rebound hammer, ultrasonic pulse velocity, core test, half-cell potential, carbonation depth, chloride tests, load test.
- Analyse the causes and severity.
- Select the repair or strengthening method and its timing.
Features and advantages
- Repair is done only when needed, so the cost is lower than for fixed-interval work.
- Hidden faults are found before failure, so safety improves.
- It helps to select a repair that treats the cause, not just the symptoms.
- It gives a database for judging the remaining life of a structure.
Limitations
It needs skilled staff and testing equipment, and the initial cost of inspection may be high.
Example: testing a 30-year-old RCC building for carbonation and corrosion before deciding whether to coat, patch or jacket the columns.
✓ Answer checked by Claude Opus 5.5 (high effort)