maintenance strategies & case studies

Maintenance Strategies

Case Studies

&

Maintenance Strategy

• Inspections

• Estimation of deterioration levels and rates

• Evaluation of performance of structure

• Remedial actions

• Recording

Inspection

The change in performance of a structure should be detected through inspection.

The inspection is classified as:

Initial inspection

Routine inspection

Regular inspection

Detailed inspection

Extraordinary inspection

Deterioration & Evaluation of

Performance of structure

Deterioration of the structure should be determined on the basis of the

inspection results, design and construction records.

Appropriate models are needed to be able to estimate the deterioration rate.

The performance of the structure is then evaluated based on the estimated

level and rate of deterioration.

Case studies

1. Failure of Overhead Water

Tank in the State of Uttar Pradesh.2. Repair and Rehabilitation of

Nehru Memorial College of

K.V.G. Group of Institutions at

Mangalore

Overhead Water Tank in the State of

Uttar Pradesh The state government of Uttar

Pradesh had launched the safe

drinking water project for rural

population living in remote areas.

The job of implementation of the

scheme was given to the

corporation “JAL NIGAM” which

deals with the public water

management in the state.

However the project was a failure.

Reasons for failure

• The failure of the water tanks can thus be attributed to poor quality of concrete in terms

of durability. The tanks surveyed for damage being in rural areas where it is difficult to

maintain the quality of concrete

• Lack of quality control has caused minor cracks in the water tanks, which lead to the

leakage and deterioration of concrete.

• The reasons of failure thus are due to the improper selection of material, mix, placement,

compaction, leaking formwork temperature control, curing leading to honeycombed and

porous concrete.

Nehru Memorial College of K.V.G.

Group of Institutions at Mangalore

o Nehru Memorial College of Sri Kurunji Venkatramana Gowda (KVG) Group of

Institutions is located at Sullia near Mangalore, a costal city in the State of

Karnataka.

o It was established in the year 1967. This 40 year old Institution consists of

framed structures of G+1 and G+2 storied of different blocks which

experienced severe water leakages and environmental distress leading to

cracking, spalling and deterioration of the structural members.

Distress Observed

Since the building was very old and

located in a marine climate, the water

leakages and reinforcement corrosion were

major issues. There were leakages in the roof

and water seepage through the external walls

There were some cracks in the masonry

walls. At those locations the plastering was

chipped of and cutting of V-grooves were

made along the length of the crack by

chiselling. A wire mesh was fixed along the

cracks after which the cracks were repaired

with medium structural grade repair mortar.

External Wall Plastering and

Protective Coating

All the external wall plaster

were loosened and debonded from

the masonry surface for which

plastering was chipped out and

replastering was done. It was

finished with cement mortar

admixed with polymer modified

mortar and finally protected with

an elastomeric acrylic coating.

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