Crazing from over troweling or cement dusting to speed drying (1) or surfaces formed with impermeable materials(2)- Cracks caused temperature related contraction (3)
- Plastic shrinkage crackes are caused when drying ocurrs to quickly and low rates of bleeding. This can be seen on elevated slabs (4), grade-level slabs (5) and over reinforcement (6)
- Plastic Settlement Cracks (7,8,9) caused by excess bleeding and early drying that is too fast.
- Ineffective constraction joints caused by cuts made too late in the drying process(10), cuts that are too shallow (11) overlays between reinforcement and joints (12)
This information is condensed from the Concrete Society’s publication
TR22 Non-structural cracks in concrete.