Freeze-thaw cycle A freeze-thaw cycle is the repeated freezing and thawing of water inside concrete, soil, or small cracks.
When moisture gets into a sidewalk and then freezes, it expands; when it thaws, it contracts. That movement can widen cracks, loosen slabs, and create uneven surfaces that trigger DOT repairs. In NYC, freeze-thaw damage is a major reason sidewalks deteriorate after winter and why preventive maintenance matters.
Frequently Asked Questions About Freeze-thaw cycle
What is a freeze-thaw cycle?
The repeated freezing and thawing of water inside concrete, soil or cracks, which expands and contracts the material.
Why is it so damaging to sidewalks?
Each cycle widens cracks, loosens slabs and lifts sections, progressively converting minor defects into cited hazards.
How many cycles does NYC see?
The region crosses the freezing point repeatedly through winter, so concrete experiences many cycles each season rather than one long freeze.
How is the damage limited?
Air-entrained concrete, good drainage, sealed joints and keeping water from ponding on or beneath the slab.