When concrete is first placed, moisture will evaporate from the surface faster than within the mass of the concrete. As the surface begins to cure faster than the concrete below the surface, tensile stresses build up and shallow microscopic cracks develop in random directions.
If allowed to develop without restraint, these cracks can grow wider and lengthen to become major aesthetic and functional problems.
Cracks also occur due to excessive flexural stresses brought on by bending when spanning distances. These cracks are considered structural failure cracks and are wider and predictable
Fibre reinforcing is very good in restricting the initial shrinkage cracking that occurs in the initial stages.
Fibre reinforcing has no impact on the air content of concrete compared to the same sample of non-fibre concrete, but the impact on slump is significant.
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Mayank
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