Necessitation of the maintenance
The causes which necessitate the
maintenance effects the service and durability of the structure as follows:
wear and tear
1 Atmospheric Agencis
Rain: It is the
important source of water which affects the structure in the following ways:
Expansion And contraction
material is subjected to repetitive expansion and contraction while they become
wet and dry and develops the stresses
and carrying away minerals as it is universal solvent
Chemical: The water
available in nature contains acids and alkali and other compound in dissolved
form acts over the material to give rise, which is known as chemical
Wind:It is the agent, which
transports the abrasive material and assists the physical weathering.
Temperature: The diurnal, seasonal
and annual variation of the temperature, difference in temperature it
causes expansion and contraction.
2.Normal wear and tear
During the use of structure it is
subjected to abrasion and thereby it looses appearance and serviceability
3 Failure of structure
design- Due to incorrect, insufficient data regarding use, loading
and environmental conditions, selection of material and poor detailing.
construction-poor materials, poor workmanship, lack of quality
control and supervision.
ü Improper use of structure- overloading, selecting the structure for the use they not designed impurities from industrial fuel burning, sea water minerals etc.