UNIT 1

1. By
Er.D.Mythili M.E., (Ph.D)
ASSISTANT PROFESSOR
DEPARTMENT OF CIVIL ENGINEERING

2. UNIT-1
MAINTENANCE AND REPAIR STRATEGIES
 Maintenance
 Repair and rehabilitation
 Facets of Maintenance
 Importance of maintenance various
aspects of Inspection
 Assessment procedure for
evaluating a damaged structure
 Causes of deterioration

3. Maintenance…
 Maintenance is a set of organized activities that are
carried out in order to keep the item in its best
operational condition with minimum cost.
 It is the act of keeping something in good condition
by checking or repairing it regularly.

4. Repair…
 To replace or correct the deteriorated or faulty
materials , components, or elements of a
structure.
 It is the action that improves or replaces the
functionality of a member of the structure.
 The action may not be intended to regain the
original strength of the member completely.

5.  Rehabilitation
 The process of repairing or modifying a
structure to a desired useful condition.
 The action is intended to regain the original
strength of the member completely.

6.  IMPORTANCE OF MAINTENANCE
1. Improves the life of structure.
2. Better appearance and aesthetically appealing.
3. Prevents major deterioration and leading to
collapse.
4. Ensure safety to occupants.
5.Ensures feeling of confidence of the user.
6. Leads to quicker detection of defects and hence
remedial measure.

7.  FACETS OF MAINTENANCE
1. Emergency Maintenance :
Ex : Breakdown of drainage or damaged caused
by natural like fire ,floods ,cyclone, earthquake.
2. Condition based maintenance :
(i.e.) work initiated after due inspection
3. Fixed time maintenance :
Activities repeated at fixed interval of time.
4.Preventive maintenance:
works is done before failure takes place
5. Opportunity maintenance:
with in the limits of operational demand.
6.Day to day care and maintenance:

8.  FACETS OF MAINTENANCE
7. Corrective maintenance:
Ex : corrosion maintenance , repair of cracks
etc…
8. shutdown maintenance :
Through maintenance after closing a facility

9. CLASSIFICATION OF MAINTENANCE
Preventive Maintenance
Work done before the defects occurred or damage
developed in the structure
Example : Soil Stabilization, Water Proof Course,
Termite Proofing, etc
Remedial Maintenance
Work done after the defects or damage occurs in
the structure
Example : Renovation, Rectification

10. CLASSIFICATION OF MAINTENANCE
Daily Routine Maintenance:
 Basically an inspection oriented and may not
contain action to be taken .
 Help in identifying major changes,
development of cracks, identifying new
cracks etc.
 Inspection of all essential items by visual
observation.
 Check on proper function of sewer, water
lines, wash basins, sinks etc.
 Check on drain pipes from roof during
rainy season

11. CLASSIFICATION OF MAINTENANCE
Daily Routine Maintenance
 Proper function of sewer line, water lines,
wash basins, sinks , etc
 Check on drain pipes from roof during rainy
season
Weekly Routine Maintenance:
 Electrical accessories
 Cob webs cleaning
 Flushing sewer line .
 Leakage of water line.

12. CLASSIFICATION OF MAINTENANCE
Monthly Routine Maintenance:
 Cleaning doors, windows , latches etc…
 Checking septic tank /sewer.
 Observation for cracks in the elements.
 Cleaning of overhead tanks
Yearly Routine Maintenance:
 Attending to small repairs and white washing
 Painting of steel components exposed to
weather.
 Check of displacement and remedial measures.

13. FACTORS INFLUENCING MAINTENANCE
 Cost
 Age of building
 Availability of physical resources.
 Urgency
 Future use
 Social consideration

14. PHYSICAL INSPECTION
STUDY DOCUMENTS
ESTIMATE OF LOAD ACTING
ESTIMATE OF ENVIRONMENTAL EFFECTS
DIAGNOSIS (Identification of the
nature and cause )
RETROSPECTIVE ANALYSIS (Relating to the past or
something that happened in the past.”
IS DIANGOSIS CONFIRMED
MATERIAL
TESTS
ASSESSMENT
PROCEDURE
FOR DAMAGE
ASSESSING OF
STRUCTURAL ADEQUACY
LOAD TESTS
YES
NO

15. Detoriation
The process of becoming progressively worst.
Causes of Detoriation
Spalling of concrete cover
 Cracks parallel to the reinforcement
 Spalling at edges
 Swelling of concrete
 Dislocation
 Internal cracking and reduction in area of steel
reinforcement
 Poor quality of the material used
 Environmental Effects
 Design and construction faults
 Quality of supervision

16. Thank You