Cracks can be commonly seen in almost all form of concrete surface. The cracking may appear either immediately or may occur after many years of its pouring, but it is inevitable. There can be many different reasons for concrete cracks. In this small write up, we have provided brief details of different kinds of concrete cracks, along with their reasons so that you may do something to prevent them.
- Plastic shrinkage cracks
Most of the earliest cracks are due to a process called plastic shrinkage. This can occur in case the mixture prepared for the slurry is too watery. Due to excess water, it will try to take up space, as a result the solid ingredients tend to get separated. As the water evaporates, mix will have spaces which will be left with cracks that may be hair thin sometimes.
- Heaving cracks
Heaving is caused by either raising of concrete due to movement beneath the concrete slabs or because of excessive thaw and freeze cycles. Usually, you can find sidewalks or any pavement that lies near a tree root develop in cracks due to heaving.
- Settling cracks
Cause of cracks due to settling poses just the opposite of heaving issue. As the tree is removed, the roots underneath start getting decomposed, the concrete will crack because of this settling. The next reason of crack by settling is due to underground plumbing or wiring. With little movements underneath the concrete may cause cracking.
- Pressure cracks
Pressure cracks are usually because of placing heavy weight on the slab top. Excessive weight may put extra stress on slab or the ground underneath your slab that may cause cracking.
- Crazing cracks
Crazing cracks are usually are surface cracks which is very small and resemble spider webs that is caused by premature slab drying. In case slab doesn’t have sufficient moisture or its moisture loses too quickly, such crazing cracks can get formed. As these cracks are too minor and can only be seen on the surface, hence they don’t need any repair.
- Crusting cracks
Crusting cracks are due to stamping process, when slab is made to press for resembling certain pattern or shapes. When temperatures are high, drying will be faster on the slab top than the bottom. As the stamp gets removed, there will be small cracks around each stamp edges. They do not cause any structural problem.