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What is concrete crazing?
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Crazing is the development of a network of fine random cracks or fissures on the surface of concrete or  mortar caused by shrinkage of the surface layer. These  cracks are rarely more than 1/8 inch [3 mm] deep and  are more noticeable on steel-troweled surfaces. The  irregular hexagonal areas enclosed by the cracks are  typically no more than 11/2 inch [40 mm] across and  may be as small as 1/2 or3/8 inch [12 or 20 mm] inunusual instances.
Generally, craze cracks develop at  an early age and are apparent the day after placement  or at least by the end of the first week. Often they are  not readily visible until the surface has been wetted  and it is beginning to dry out.
Crazing cracks are sometimes referred to as shallow  map or pattern cracking. They do not affect the
  structural integrity of concrete and rarely do they affect durability or wear resistance. However, crazed
 surfaces can be unsightly. They are particularly conspicuous and unsightly when concrete contains calcium chloride, a commonly used accelerating admixture

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