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properties and tests on concrete:


durability is the property of concrete by virtue of which it is capable of resisting its disintegration and decay.the concrete should be durable with proper regard to the various weathering conditions such as action of atmospheric gases,moisture changes,temperature variations

a) use of unsound cement,which due to some delayed chemical reactions,undergo volume changes after the concrete has hardened.

b) use of less durable aggregate,which may either react with cement,or may be reacted upon by atmospheric gases.

c)entry of harmful gases and salts through excessive pores and voids present in unsound concrete,causing its disintegration.

d)freezing and thawing of water sucked through the cracks or crevices,by capillary action causing its disintegration.

e)expansion and contraction resulting from temperature changes or alternate wetting and drying.

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