Blisters are small, hollow bumps on a concrete surface that can form shortly after the finishing of a concrete project. These blisters can be as small as a dime and get up to around two or three inches in diameter. Often, concrete blistering goes undetected and unnoticed in poorly lit areas or until the blisters break open underneath the weight of traffic.
Blisters form on fresh concrete when the surface becomes prematurely sealed as it dries, causing bubbles of air or bleed water to get trapped just beneath the surface. Concrete blisters are not easily repaired after the concrete hardens. There are some elements to control to minimize the chance of concrete blistering. Blisters are more likely to form if:
The number one way to avoid concrete blisters is to be aware of when a concrete surface appears to be ready for finishing, and when it is actually ready for finishing. It is crucial to allow enough time and ideal conditions for air and bleed water to escape the slab. In addition to taking the above mentioned precautions, the following are ways to prevent blisters from occurring:
Sometimes blistering can begin to form even after taking steps to avoid them. In this case, do your best to flatten your trowel blades or tear openings along the surface to delay the surface from finishing as much as possible. When pouring new concrete slabs, be sure to only select experienced professionals. Contact Liberty Ready Mix today to keep your new concrete free from blistering.