What are crazing cracks?
Crazing cracks are sometimes referred to as map or pattern cracks because the cracking resembles a road map. Crazing is the development of a network of fine random cracks on the surface of concrete caused by shrinkage of the surface layer. To prevent crazing, start curing the concrete as soon as possible. Curing retains the moisture required for the proper reaction of cement with water. Use moderate slump concrete. If you need additional workability, request water-reducing admixtures. Never sprinkle or trowel dry cement on the surface of plastic concrete to absorb bleed water. Do not sprinkle water on the slab to make finishing easier. Do not perform any finishing operation while bleed water is present on the concrete surface. When high evaporation rates are possible, lightly dampen the sub-grade prior to placement to prevent it from absorbing too much water from the concrete. Crazing cracks develop at an early age and are most readily visible when the surface is wet. They are particul
