WATER TO CEMENT RATIO


WATER TO CEMENT RATIO

The ratio between water and cement by weight is known as Water Cement Ratio.



The quantity of water added to the cement while preparing concrete mixes has been known to exert tremendous influence on the quality of concrete.

Cement and water are the only two chemically active elements in concrete.

By their combination they form a glue like binder paste which create bond between fine aggegates and course aggregate.

Water is the most important element in concrete governing all the properties of cement concrete like durability, strength and fire resistance.

WATER TO CEMENT RATIO



THE FUNCTIONS OF MIXING WATER ARE :

·         When water mix with cement ,The chemical reaction starts between water and cement ,

·         This reaction starts the hydration in past  from that the cement and water past starts setting      according to the type of cement and type of construction.


  •        To make the concrete workable so that it can be placed easily and uniformly between the reinforcing    bars and in the corners.

  •          The strength of the concrete depends on water to cement ratio.

Therefore we need to use the amount of water carefully while mixing the concrete.

Too much water can increase the workability ,but it will also effect the strength of concrete.

If less water used it will increase the strength and durability but will decrease the workability.

It can be seen that lower water cement ratio could be used when the concrete is vibrated to achieve higher strength, whereas, comparatively, higher water cement ratio is required when concrete is hand compacted.

In both cases when the water cement ratio is below the practical limit, the strength of concrete falls rapidly due to introduction of air voids.

FUNCTION OF WATER IN CONCRETE.


1.      It hydrates the cement, which is an essential chemical reaction for formation of complex silicate crystalline gels that are responsible for the strength of the cement.

2.      It lubricates all the concrete ingredients, by passing around them in the form of films. Hence it is responsible for the plasticity and mobility of concrete which define its workability.

EFFECTS OF EXTRA WATER IN CONCRETE


Any extra amount of water added to concrete ingredients at the time of mixing also course segregation of aggregates during transport and placement.

WHAT IS BLEEDING OF CONCRETE

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