Question

Moisture movement in concrete is one of the factor that influencing shrinkage and creep. Elaborate this effect and how to differentiate between these properties. please i need full answer about how the moisture is a factor of shrinkage and creep . and what is the different between them...in detail

Answer 1

DIFFERENTIATION

CREEP >>>> IT IS PERMANENT FAILURE BY CONSTANT LOADING OVER A PERIOD OF TIME. AFTER WHICH OBJECT NOT ABLE TO REGAIN ITS ORIGINAL SHAPE AND SIZE.

SHRINKAGE >>>>>> IT IS A EFFECT DUE TO LOSS OF MOISTURE IN CONCRETE. THE OBJECT SIZE REDUCES OR WE SAY CONTRACT. OR WE SAY REDUCTION IN VOLUME.

FACTORS WHICH ARE RESPONSIBLE FOR CREEP AND SHRINKAGE.

FOR SHRINKAGE ::::: It is loss of moisture in concrete by which it reduces its size. It is due to less curing of concrete , worst placing of concrete , exposed directly to sun , due to presence of more alkali which reacts with silica content in cement and leads to formation of gel which also leads to shrinkage this effect is called alkali silica reaction in short ASR.

More ever , It also depend upon water - cement ration which W/C , if cement is high then it leads to more lubrication by which mixture become harsh.

and there are many other factors also.

CREEP ::::::::: IT IS CHANGE IN SHAPE AND SIZE DUE EXTERNAL LIVE LOAD , SO IT DEPENDS ON EXTERNAL LOAD VALUE AS WELL WE KNOW THAT EVERY OBJECT HAVE ITS YOUNG MODULAS , SO THIS IS ALSO A FACTOR.

IN BREIF CREEP IS MAINLY DEPEND ON ITS OWN PROPERTY IT DOSENT DEPEND ON ATOMOSPHERIC CONDITION.

BUT EXTERNAL PLAYS A VITAL ROLE ALSO.

If moisture is more than water content is more so W/C is more hence better Workability will come , then shrinkage is less comparitively.

In CREEP , If moisture is more than particle deform easily because it require less force to change its shape.

it become more elastic.

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